I’ve spent years caring for horses with stiff joints or those just starting to feel their age. The benefits of Omega-3 fatty acids for equine joint health are more than just hype— Research has demonstrated that Omega-3 fatty acids can reduce inflammation markers in arthritic horses, supporting their role in joint health (Manhart et al., 2009)— they can make a real difference in comfort, movement, and long-term well-being.
A balanced diet, free choice hay, regular exercise, and ample turnout always come first, but some horses need a little extra support. Omega-3s have helped my own horses move more freely and recover faster. I’ve researched the science, tested products, looked online and want to share the products with you so we can review them together.
Why Omega-3s Matter for Equine Joint Health
Omega-3 fatty acids are essential fats, meaning horses can’t produce them on their own. They must come from the diet. Omega-3s help modulate the body’s inflammatory response—particularly important for horses with joint stiffness, arthritis, or aging joints, but just as important for active horses that need joint support.
Research shows Omega-3s can:
- Improve joint flexibility and comfort
- Reduce stiffness, especially after work or turnout
- Support overall mobility and recovery
Studies indicate that Omega-3 supplementation may aid in managing chronic inflammatory conditions such as osteoarthritis and equine metabolic syndrome, laminitis, and thereby help to improve longevity of sport horse. (Hess et al., 2014).
Whether your horse is a young athlete or a senior needing support, Omega-3s are a smart, simple addition to any wellness plan.
Flaxseed
Also known as linseed, flaxseed comes from the Linum usitatissimum plant and has been cultivated for centuries for its oil and fiber. In equine nutrition, flaxseed is valued for its high fat, protein, and fiber content, as well as its role as a rich source of omega-3 fatty acids, specifically alpha-linolenic acid (ALA). It’s commonly used to enhance skin and coat health, support weight maintenance, and improve the omega-3 to omega-6 ratio in the diet, especially for horses on hay or grain-based rations.
Flax is naturally rich in nutrients: about 40% fat, 30% fiber, and 30% protein. It also contains essential amino acids (notably lysine), B-complex vitamins, vitamins A and E, and minerals such as magnesium, potassium, iron, calcium, and phosphorus. The seeds also contain lignans, phenolic acids, and flavonoids that have been researched for their anticancer and anti-oxidative properties.
✅ Benefits of Feeding Flax to Horses
- Excellent source of cool calories for weight gain or maintenance
- High in omega-3s (ALA) – supports coat quality, skin health, and may help with allergies
- Provides a source of protein, contains 18% protein
- Supports shine and skin hydration through increased sebum production
- May help reduce allergenic skin responses, including sweet itch
- Safe for horses that need low NSC like horses with insulin resistance, PSSM, PPID
- May support nutrient absorption of fat-soluble vitamins (A, D, E, K)
Treat that promotes a shiny coat and healthy skin, with added vitamins and minerals.
Another great idea is giving smart treats to your horses. Like in Omega’s Nibblers – Apple or Peppermint flavor, Ground Flaxseed is the main ingredient and it has no added molasses. This is one example, but there are many other healthy and meaningful treat options, I will try writing an article about it soon.
⚠️ Cautions & Considerations
| Concern | Notes |
|---|---|
| Rancidity Risk | Fatty acids can be vulnerable to rancidity when being exposed to light, air and water; horse’s should be fed freshly ground flax or buy stabilized products. |
| Low EPA/DHA | Flax contains ALA, this is the precursor of EPA or DHA—the active omega-3s responsible for most anti-inflammatory benefits. Conversion in horses is extremely limited. |
| Mineral Balance | Flax is high in phosphorus; ensure the diet includes enough calcium to maintain balance. |
| Cyanide Concerns | Whole or ground flax contains cyanogenic glycosides, but in normal feeding amounts, there’s no evidence of toxicity. Stabilized flax or proper feeding management eliminates this risk. |
| Not ideal for all goals | For direct anti-inflammatory benefits, fish oil or EPA and DHA-rich products is more effective than flax. |
Quick stop… A Quick Note on Oils vs. Natural Fats
While I’m giving you the facts on what’s commonly fed in the industry—yes, including oils—I want to be crystal clear about my stance: I do not recommend feeding liquid oils to horses.
Horses didn’t evolve to digest large amounts of fat, especially in processed liquid form. They lack a gallbladder and are designed to extract small amounts of essential fatty acids (like omega-3s) from forage.. If you want to understand why feeding oil into your horse’s bucket isn’t as harmless as it sounds, read my full article on why I don’t feed oil to horses →
In this guide, you’ll see oil come up a lot—and it’s true that it’s a popular omega-3 source in the supplement world. But in my opinion, the best way to feed is as natural as possible, so I would feed stabilized ground flaxseed. It’s closer to the natural form your horse’s gut can handle, and it comes with the added benefits of fiber and lignans.
| Form | Description | Notes |
|---|---|---|
| Whole Flaxseed | Intact seed | Hard to digest; may pass undigested |
| Ground Flaxseed | Crushed for better absorption | Must be used quickly to avoid rancidity |
| Stabilized Flaxseed | Heat-treated ground flax | Extended shelf life, less oxidation risk |
| Flaxseed Oil | Pure oil pressed from seeds | High-calorie, concentrated fat source; lacks fiber and protein |
| Flax Meal | Byproduct after oil extraction | Lower fat, higher fiber and protein |
Next, I’ll walk you through some popular products that horse owners commonly use—along with my own notes and thoughts on each. But before we dive in, it’s important to remember: no supplement will make up for an unbalanced diet. If your horse’s core nutrition isn’t meeting their needs, you likely won’t see the results you’re hoping for—and in some cases, you may not need the supplement at all. Often, simply balancing the diet is enough to help your horse look, feel, and perform better.
Smart & Simple® Flax – ★ 4.8 (+125 reviews on SmartPak and Amazon)
Sometimes a dull coat and dry skin may be a sign that you're horse is lacking Omega's in his diet. Flax would be a great addition.
Ingredients: Flaxseed Meal, Mixed Tocopherols (preservative).
Dose: Feed 26g daily (1 scoop = 26g) for a 500kg horse
💰 $29.42 ($0.65 / day) – 2.6-lb Bag (45 day supply)
💰 $51.53 ($0.57 / day) – 5.2-lb Bag (90 day supply)
💰 $157.4 ($0.44 / day) – 20.8-lb Bucket (360 day supply)
Pros:
✔ Stabilized flax—no rancidity issues
✔ Promotes healthy, resilient and shiny skin and coat
✔ Uncomplicated
Cons:
✘ Doesn’t contain DHA or EPA in case you were looking for inflammatory response support.
Guaranteed Analysis per 26g:
| Ingredient Name | Amount Per Serving |
| Crude Protein | 18% |
| Crude Fat | 37% |
| Alpha-Linolenic Acid (an Omega 3 Fatty Acid) | 21% (5,600 mg) |
| Oleic Acid (an Omega 9 Fatty Acid) | 7% (1,800 mg) |
| Linoleic Acid (an Omega 6 Fatty Acid) | 5% (1,300 mg) |
| Crude Fiber | 27% |
SmartOmega 3 & E™ Ultra – ★ 4.4 (+125 reviews on SmartPak)
This producted is designed to promove wellness and vitality to your horse by providing two fundamental ingredients for this: Omega 3s from flaxseed, chia seed and fish oil, along with 1,500 IU of natural vitamin E, to support healthy muscles and a strong immune system.
Ingredients: Flaxseed Meal, Fish Oil Powder, D-Alpha Tocopherol, Fish Oil, Chia Seed, Fenugreek, Mixed Tocopherols (preservative).
Dose: Feed 30.5g daily (1 scoop = 30.5g)
💰 $54.68 ($0.98 / day) – 3.8-lb Bag (56 day supply)
💰 $104.16 ($0.93 / day) – 7.5-lb Bag (112 day supply)
Pros:
✔ Contains Vitamin E
✔ Promotes overall wellnes and vitality
✔ Added fish oil
Cons:
✘ Contains lower amounts of DHA than fish oil, if what your looking is a stronger inflammation recovery and performance support
Guaranteed Analysis per 30.5 g:
| Ingredient Name | Amount Per Serving |
| Crude Protein (Min) | 15% |
| Crude Fat (Min) | 32% |
| Crude Fiber (Max) | 23% |
| Alpha-Linolenic Acid (an Omega 3 Fatty Acid) (Min) | 21% (6,500 mg) |
| Eicosapentaenoic Acid (EPA) (Min) | 1.5% (465 mg) |
| Docosahexaenoic Acid (DHA) (Min) | 1% (310 mg) |
| Oleic Acid (an Omega 9 Fatty Acid) (Min) | 5% (1,600 mg) |
| Linoleic Acid (an Omega 6 Fatty Acid) (Min) | 4% (1,300 mg) |
| Vitamin E (Min) | 1,500 IU |
Simply Flax by Manna Pro – ★ 4.8 (+900 reviews on Amazon and Tractor Supply)
Manna Pro Simply Flax is a premium equine nutritional supplement designed to support healthy skin, a shiny coat, and optimal overall wellness in horses of all ages and activity levels
Ingredients: 100% pure ground flaxseed
Dose: Feed 2-8 oz. Simply FLAX per horse, per day
The enclosed scoop holds about 1 oz
💰 $54.68 ($0.98 / day) – 3.8-lb Bag (56 day supply)
💰 $104.16 ($0.93 / day) – 7.5-lb Bag (112 day supply)
Pros:
✔ 100% pure ground flaxseed
✔ No added fillers, preservatives or chemical processing
✔ Stabilized flax—no rancidity issues
Cons:
✘ Doesn’t contain DHA or EPA in case you were looking for inflammatory response support.
| Guaranteed Analysis | Concentration | Per 4oz |
|---|---|---|
| Crude Protein Min | 18% | 20 g |
| Crude Fat Min | 34% | 38 g |
| Crude Fiber Max | 12% | 14 g |
| Ash Max | 5% | 6 g |
| Omega-3 Fatty Acids Min | 18.75% | 21 g |
Absorbine® Flex + Max® – ★ 4.7 (+500 reviews on Amazon and SmartPak)
Absorbine has as a main ingredient flaxseed, but then adds extra ingredients like MSM, Boswellia Chondroitin Sulfate and more, to turn into an all-inclusive horse joint supplement, and improving your horse's skin and coat in the process.
Inactive Ingredients: Alfalfa Meal Dehydrated, Calcium Propionate (preservative), Fenugreek Seed, Yeast Culture
Dose: Administer 75 g once daily by filling enclosed scoop to the 1/2 cup line.
💰 $59.99 ($2.00 / day) – 5-lb Bag (30 day supply)
💰 $102.09 ($1.70 / day) – 10-lb Bag (60 day supply)
Pros:
✔ Joint support
✔ No fillers
✔ Guaranteed levels of glucosamine and chondroitin
Cons:
✘ Pricier
✘ Doesn’t contain DHA or EPA in case you were looking for inflammatory response support.
Active Ingredients per 75g:
| Ingredient Name | Amount Per Serving |
| Flaxseed | 11 g |
| Glucosamine HCl (Shellfish Source) | 10,000 mg |
| Rice Bran | 5.6 g |
| Methylsulfonylmethane (MSM) | 5,000 mg |
| Chondroitin Sulfate (Porcine Source) | 1,200 mg |
| Hyaluronic Acid | 150 mg |
| Boswellia Serrata | 130 mg |
Omega Horseshine® – ★4.8 (+850 reviews on SmartPak)
Omega Horseshine was Horse Journal's product of the year. And you can see from reading it's reviews how popular and liked it is!
It is a fortified, stabilized ground flaxseed supplement rich in ALA omega-3 fatty acids, benefiting:
- Healthy skin and shiny coat
- Mares and foals in gestation, lactation and growth
- Support performance
- Strong hooves
Ingredients: Ground Flaxseed, Biotin, Yeast Culture, Zinc Methionine Complex, Ground Oats, Calcium Carbonate, Lysine, Copper Lysine Complex, Sodium Selenite, Folic Acid, Niacinamide, Manganese Sulfate, Calcium Pantothenate, Pyrdidoxine Hydrochloride (Vitamin B-6), Vitamin B-12 Supplement, and Riboflavin.
Dose:
Maintenance: 1/2 – 1 cup, top dressed over feed for 500kg horse
Active: 1-3 cups per day depending on weight
💰 $31.53 ($0.88 / day) – 4.5-lb Bag (36 day supply)
💰 $63.11 ($0.39 / day) – 20-lb Bag (160 day supply)
💰 $136.79 ($0.38 / day) – 45-lb Bag (360 day supply)
Pros:
✔ High-quality, stabilized flax—no rancidity issues
✔ Excellent for coat shine and hoof strength (10mg of biotin per serving)
✔ Rich in fiber for gut support
✔ Low NSC (4.4%) for IR/Cushing’s horses
Cons:
✘ Lower DHA/EPA compared to marine-based oils
Guaranteed Analysis:
| Ingredient Name | Amount Per Pound |
| Crude Protein, Min. | 20.00% |
| Crude Fat, Min. | 38.00% |
| Crude Fiber, Max. | 15.00% |
| ADF, Max. | 19.00% |
| NDF, Max. | 24.00% |
| Dietary Starch. Max. | 2.30% |
| Sugar, Max. | 3.60% |
| Calcium, Min. | 0.50% |
| Calcium, Max. | 0.55% |
| Phosphorous, Min. | 0.59% |
| Magnesium, Min. | 0.35% |
| Potassium, Min. | 0.74% |
| Potassium, Max. | 0.76% |
| Copper, Min. | 139.00 ppm |
| Selenium, Min. | 2.70 ppm |
| Zinc, Min. | 343.00 ppm |
| Manganese, Min. | 126.00 ppm |
| Moisture, Max. | 6.80% |
| Omega-3 Fatty Acids, Min. | 18.50% |
| Omega-6 Fatty Acids, Min. | 6.00% |
| Omega-9 Fatty Acids, Min. | 6.00% |
| Biotin | 64.00 mg |
Platinum Performance® CJ – ★5 (+125 reviews on Platinum Performance)
This is a top-tier supplement for healthy, performance, or hard-keeping horses needing support for:
- Hooves and coat
- Joint function
- Muscle tone and topline
- Immune and antioxidant support
Some owners swear by this product, claiming improved joint health and increased mobility, while others find it expensive and suggest exploring alternative, potentially more cost-effective options with similar ingredients.
Dose: 2 scoops once a day or give 1 scoop twice a day (1 scoop (78g)) for a 500kg horse
Recommended for use within 5 months of manufacture date. The 135lb size is recommended for supplementing more than four horses daily.
💰 $179.00 ($6.17 / day) – 10-lb Bag (58 servings)
💰 $316.00 ($6.25 / day) – 17.5-lb Bag (101 servings)
💰 $449.00 ($6.19 / day) – 25-lb Bag (145 servings)
💰 $899.00 ($6.2 / day) – 50-lb Bag (290 servings)
💰 $2190.00 ($5.57 / day) – 135-lb Bag (785 servings)
Pros:
✔ Contains Boswellia serrata for joint support and healthy levels of inflammation
✔ MSM for joint suppport and healthy skin and coat
✔ HA and ASU to reduce bone friction and support cartilage
Cons:
✘ Higher cost than basic joint supplements
✘ Even though it’s a multipurpose supplement, it is not a ration balancer. So if the horse is not fed a balanced diet, you might not see results
Joint Support Blend:**
| Per 2 scoops | |
|---|---|
| Glucosamine Sulfate 2KCl | 8,820 mg |
| Methylsulfonylmethane (MSM) | 8,200 mg |
| Avocado/Soy Unsaponifiables | 2,000 mg |
| Boswellia Serrata Extract | 1,400 mg |
| Cetyl Myristoleate | 275 mg |
| Hyaluronic Acid | 90 mg |
| Active Ingredients per 2 scoop serving (156g) | |
|---|---|
| Flaxseed | 64 g |
| Joint Support Blend ** | 23.4 g |
| Stabilized Rice Bran | 21 g |
| Omega-3 Fatty Acids (Flax Oil) | 12 g |
| Bentonite | 11 g |
| Sunflower Kernel | 6.8 g |
| Omega-6 Fatty Acids (Flax Oil) | 6 g |
| L-Lysine (Lysine Hydrochloride) | 729 mg |
| Vitamin C (Absorbic Acid) | 715 mg |
| Zinc (Zinc Amino Acid Complex) | 151 mg |
| Manganese (Manganese Citrate) | 130 mg |
| Calcium (Calcium Carbonate) | 124 mg |
| Vitamin B5 (Calcium D-Pantothenic Acid) | 46 mg |
| Vitamin B3 (Niacin) | 21 mg |
| Vitamin B6 (Pyridoxine Hydrochloride) | 20 mg |
| Copper (Copper Amino Acid Complex) | 16 mg |
| Vitamin B2 (Riboflavin) | 10 mg |
| Folic Acid | 8 mg |
| Vitamin B1 (Thiamine Mononitrate) | 6 mg |
| DL-Methionine | 4 mg |
| Magnesium (Magnesium Gluconate) | 4 mg |
| Biotin | 3 mg |
| Cobalt (Cobalt Chelate) | 1.04 mg |
| Iodine (Potasium Iodide) | 0.9 mg |
| Selenium (Selenium Yeast) | 0.8 mg |
| Choline (Choline Bitartrate) | 0.24 mg |
| Vitamin B12 | 0.06 mg |
| Vitamin A | 5,000 IU |
| Vitamin D3 | 1,500 IU |
| Vitamin E (D-Alpha-Tocopheryl Acetate) | 1,000 IU |
Chia Seeds
Chia seeds, derived from the Salvia hispanica plant, are a nutrient-rich feed ingredient increasingly popular in equine diets. Native to Central America and part of the mint family, chia has been cultivated for over 5,000 years. These tiny seeds are packed with digestible fat, fiber, protein, essential fatty acids, minerals, vitamins, and antioxidants—earning them a reputation as a natural “superfood.”
Chia Seed Composition (mg per 100 g of dry seeds)
| Component | Range |
|---|---|
| Fat (total) | 20% – 34% |
| — ALA (Omega-3) | 60.94 – 64.6 g |
| — LA (Omega-6) | 17.36 – 19.9 g |
| — Oleic Acid (Omega-9) | 6.77 – 10.55 g |
| Protein | 16% – 26% |
| Dietary Fiber | 23% – 41% |
| Carbohydrates | ~6% – 8% |
| Vitamin | Range |
|---|---|
| Niacin (Vitamin B3) | 8.80 – 8.83 mg |
| Thiamine (Vitamin B1) | 0.60 – 0.62 mg |
| Riboflavin (Vitamin B2) | 0.17 – 0.20 mg |
| Folic Acid (Vitamin B9) | 49 mg |
| Vitamin E | 0.50 mg |
| Ascorbic Acid (Vitamin C) | 1.60 mg |
| Vitamin A | 0.054 mg |
| Mineral | Range (mg) |
|---|---|
| Calcium | 430 – 806 |
| Phosphorus | 530 – 1248 |
| Potassium | 407 – 870 |
| Magnesium | 322 – 462 |
| Iron | 7.7 – 24.4 |
| Zinc | 0.6 – 10.0 |
| Copper | 0.6 – 2.4 |
| Manganese | 2.48 – 4.05 |
| Sodium | 0.26 – 150 |
| Sulfur | 150 – 200 (limited data) |
| Molybdenum | ~0.20 (limited data) |
| Selenium | ~0.06 – 0.08 (limited data) |
Chia seeds provide a rich source of omega-3 fatty acids (mainly alpha-linolenic acid or ALA), in a natural 3:1 omega-3 to omega-6 ratio—similar to fresh pasture. They also contain mucilage (offering many benefits like reducing inflammation), polyphenols, ten essential amino acids, and an array of vitamins (B1, B2, B3, A, E, and C) and minerals. This nutrient-dense profile makes chia an excellent supplement for supporting gut health, skin and coat quality, energy intake, and immune modulation.
✅ Benefits of Feeding Chia Seeds to Horses
- Cool, Digestible Energy: High in fat and low in NSC, chia provides concentrated calories without the “hot” behavior associated with starch.
- Supports Gut Motility: The mucilage in chia may help prevent sand colic by promoting smoother intestinal transit.
- Metabolic-Friendly: Low in sugar and starch, chia is suitable for horses with IR, PPID, PSSM, or other metabolic disorders.
- Coat, Skin & Allergy Support: Omega-3s in chia help improve skin hydration and may ease seasonal allergies like flax oil, although it has not been proven in research.
- Antioxidant Protection: Contains polyphenols like quercetin, rosmarinic acid, and epicatechin, which may reduce oxidative stress.
- Protein Source: Supplies key amino acids such as lysine, leucine, and arginine for tissue repair and hoof protein synthesis.
- Great for travel or show season due to long shelf life and low spoilage risk.
🥄 Feeding Guidelines & Forms
Chia seeds can be fed whole and dry—no grinding or soaking required—which makes them easier and more convenient than flax. However, feeding in a mash with water can support hydration.
- ¼ to 1 cup/day (40g–170g) for a 500 kg (1100 lb) horse
- Adjust based on goals (weight gain, skin support, omega-3 boost)
Introduce slowly over 1–2 weeks to allow gut adaptation. Always feed as part of a balanced diet, ensuring calcium is adequate since chia is slightly high in phosphorus.
⚠️ Cautions & Considerations
| Concern | Notes |
|---|---|
| Not a complete feed | Chia provides healthy fats, fiber, and micronutrients, but does not meet full vitamin/mineral needs. |
| Low EPA/DHA | Like flax, chia contains ALA, but conversion to active forms (EPA/DHA) is poor—under 10% and 0.1%, respectively. |
| Fat Digestibility | Horses new to high-fat diets need gradual introduction to increase bile production. |
| Allergies or Gut Issues | Very rare, but monitor for sensitivities when introducing any new feedstuff. |
Great antioxidant support from wild Maine blueberries, chia seeds to provide omega-3 and support skin, hair and hooves.
🆚 Chia vs. Flax: Which is Better?
| Feature | Chia | Flax |
|---|---|---|
| Omega-3 (ALA) | ~59% | ~55% |
| Cost | ❌ Pricier | ✅ Cheaper |
| Fat | 30% | 40% |
| Mucilage (gut support) | ✅ High | ✅ High |
| Antioxidant content | ✅ Higher | Moderate |
| DHA/EPA content | ❌ None | ❌ None |
| Feeding prep | ✅ Feed whole | ⚠️ Must grind and feed freshly or buy stabilized |
In my experience, both flax and chia seeds are excellent additions to a horse’s diet. I’ve seen many owners recommend one or the other—and sometimes both. After reading countless articles and studies, I’ve noticed that most sources list the same benefits without clearly favoring one. That’s because the differences between them are relatively minor.
At the end of the day, it comes down to your horse’s individual needs, your feeding routine, and what’s practical for you. I always recommend discussing options with your veterinarian or equine nutritionist to make sure you’re choosing what best supports your horse’s health.
That said, here’s what I personally do: I feed a mix of both. By splitting the ration—half flax, half chia—you get the unique advantages of each seed, including a strong dose of ALA, fiber, antioxidants, and gut support. You can also look for a ration balancer or complete feed that already includes one or both, which can simplify things while still covering your bases.
Fish Oil / Microalgal DHA
You’ve probably heard about the health benefits of omega-3 fatty acids from fish oil, but is it a good choice for horses? Fish oil is rich in EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), two long-chain omega-3 fatty acids known for their anti-inflammatory benefits. For horses, fish oil may help support weight management, support joint health, reduced inflammation, exercise performance, and respiratory health.
However, horses are herbivores and don’t naturally consume fish in their diet. So while fish oil offers a direct source of EPA and DHA — unlike plant-based omega-3s like flax or chia which contain ALA (alpha-linolenic acid) — it may not be as palatable to some horses. Fortunately, newer sources of marine omega-3s, like microalgae-derived DHA, offer many of the same benefits without the strong fishy odor or environmental impact.
Why EPA and DHA Matter More Than ALA
Pasture grasses and some grains provide ALA, a precursor to EPA and DHA, but horses convert ALA inefficiently — less than 10% into EPA and under 0.1% into DHA. This means even high-quality plant oils may not deliver enough EPA/DHA to have the same anti-inflammatory or metabolic effects.
Microalgal DHA – Alternative to fish oil
For horse owners concerned about sustainability, palatability, or cost, according to MadBarn microalgal DHA is a compelling alternative. This plant-based marine oil offers the same benefits as fish oil but without the strong odor or risk of contamination from heavy metals. It’s also more consistent and easier to blend into feed.
Studies show that microalgal DHA improves insulin sensitivity in horses with Equine Metabolic Syndrome (EMS), reduces inflammatory markers, and even combined with yeast helps prevent dysbiosis (imbalance in microbial populations in the horse’s hindgut) in the hindgut during high-starch feeding (Which I think we should move away from these practices). Another study also suggested that microalgal DHA could minimize joint inflammation and improve comfort in horses with joint health issues.
If your horse has arthritis, metabolic issues, or struggles with recovery after exercise, direct supplementation with EPA and DHA — through fish oil or algal oil — can offer more targeted support.
My Take: While there’s no doubt that fish oil and algal DHA have real clinical benefits for some horses, I personally use these oils sparingly and at much lower doses than typically recommended. Horses didn’t evolve to eat marine oils, and I prefer to support joint health with a more holistic toolbox — like movement, forage quality, and even red light therapy, depending on the case. If I use omega-3s, I go for low-dose microalgal DHA or Fish oil, or look for feeds that cointain it or stabilized flax—not full cups of liquid oil.
✅ Benefits for Horses
- Joint Health and Anti-Inflammation: Omega-3s help reduce the production of pro-inflammatory compounds. Horses with inflammatory airway disease or joint issues may benefit from DHA and EPA to reduce pain, stiffness, and oxidative stress.
- Performance Support: Studies show horses given fish oil demonstrate lower heart rates during exercise and improved insulin sensitivity. This means better stamina and potentially improved recovery.
- Cardiovascular Health: Fish oil can help lower blood triglycerides and cholesterol, which may support cardiovascular health, especially in older or heavily exercised horses.
- Reproductive Health in Stallions: Fish oil has been shown to improve sperm concentration and motility after storage, which is especially important for breeding stallions.
- Skin and Coat Condition: Horses prone to sweet itch or skin sensitivities may benefit from oils with high levels of omega-3s.
⚠️ Cautions & Considerations
| Concern | Notes |
|---|---|
| Cost | High costs. |
| Palatability | Some products can have a strong smell and picky horses will refuse to eat it. |
| Source | Depending on the source, are the levels of DHA and EPA. Also some fish oils can have contaminants like lead and mercury that may not be disclosed on the label. |
| Peroxidation | Fish oil is susceptible to peroxidation, a process where the unsaturated fats oxidize, leading to potential health concerns (like inflammation) and a fishy taste or smell |
Why is Peroxidation a Concern in Fish Oil?
- Reduced Health Benefits: Oxidized fish oil may have reduced or altered biological activity, potentially diminishing the intended health benefits.
- Potential Negative Health Effects: Some studies suggest that oxidized fish oil may contribute to inflammation, increased cholesterol levels, and other health problems.
- Taste and Smell: Rancid fish oil can have an unpleasant taste and smell, making it unpalatable and potentially discouraging continued use.
What to Look For:
- GOED Standards: The Global Organization for EPA and DHA Omega-3 (GOED) sets limits for oxidation in fish oil supplements. A PV of 5 mEq/kg or higher and/or an AV of 20 or higher are considered excessive.
- Reputable Brands: Choose fish oil supplements from reputable brands known for quality control and freshness.
- Storage: Store fish oil supplements in a cool, dark place, preferably in the refrigerator, to minimize oxidation.
- Signs of Rancidity: Be wary of fish oil supplements with a strong fishy smell or taste, as this can indicate peroxidation.
Wellpride – ★5 (3 reviews on Wellpride) – Highly reviewed by The Horse.
Highly reviewed by The Horse.
This is a top quality product that is designed to prevent the product from going rancid and smelly like many others, in order to keep all the health benefits from fish oil.
This is a new find! And I am buying one to try it out and then make a separate product review that I will be linking here when I do it.
Ingredients: Fish Oil, Vitamin E Supplement, Flavor
Dose: 1 to 2 ounces per day for a 500kg horse
Wellpride recommends you finish the 30-ounce bottle within six weeks.
💰 $53.95 ($1.79 / day) – 30 oz Jug (30 day supply)
Pros:
✔ Pump mechanism to prevent oxygen exposure
✔ Top quality, human-grade fish oil
✔ Removed toxinis and heavy metals
✔ Provide Certificate of Analysis
Cons:
✘ Some picky eaters won’t to eat it (although they will refund your first bottle if your horse doesn’t like it).
| ANALYTICAL PARAMETERS | RESULTS | SPECIFICATION |
|---|---|---|
| Free Fatty Acids (%) | 0.09 | max 0.25 |
| Eicosapentaenoic Acid (EPA) | 19.9 | min 18.0 |
| Docosahexaenoic Acid (DHA) | 12.8 | min 12.0 |
| Total Omega-3 Fatty Acids (%) | 40.7 | min 30.0 |
| Peroxide Value (meq. O2/kg) | 1.4 | max 3.5 |
| Anisidine Value | 8.8 | max 10.0 |
| TOTOX Value | 11.6 | max 15.0 |
| Dioxins (pg (WHO TEQ)/g) | conforms | max 1.0 |
| PCB Congeners (28;52;101;118;138;153;180)(mg/kg) | conforms | max 0.09 |
| Arsenic (mg/kg) | conforms | max 0.1 |
| Mercury (mg/kg) | conforms | max 0.005 |
| Lead (mg/kg) | conforms | max 0.1 |
W-3 Oil by Mad Barn – ★4.6 (+900 reviews on MadBarn) – Microalgal DHA
A plant-based omega-3 oil blend with microalgae-sourced DHA and natural vitamin E. Supports inflammation, immune function, and skin health, also aiding in weight maintenance—without the fishy smell.
Ingredients: Soybean oil, flax oil, heterotrophic algae, d-alpha-tocopherol (natural vitamin E) and flavour.
Dose:
Maintenance – 100 mL per day per 500 kg
Weight Management – 200 mL per day per 500 kg
💰 $66.99 ($1.34 / day) – 5 L Jug (50 servings)
💰 $228.99 ($1.14 / day) – 20 L Jug (200 servings)
Pros:
✔ Less fishy smell
✔ Includes vitamin E for antioxidant protection
✔ Great for metabolic, joint, and respiratory support
Cons:
✘ Contains soy—check for sensitivities
| Active Ingredients: Per 100 mL serving | ||
|---|---|---|
| Ingredients | Per 100 mL | |
| Proprietary Blend of Soybean, flax and DHA Oil | 99 | mL |
| DHA (minimum) | 1500 | mg |
| Vitamin E (d-alpha-tocopherol) | 1000 | mg |
SmartOmega 3 & E™ Ultra – ★ 4.4 (+125 reviews on SmartPak)
This producted is designed to promove wellness and vitality to your horse by providing two fundamental ingredients for this: Omega 3s from flaxseed, chia seed and fish oil, along with 1,500 IU of natural vitamin E, to support healthy muscles and a strong immune system.
Ingredients: Flaxseed Meal, Fish Oil Powder, D-Alpha Tocopherol, Fish Oil, Chia Seed, Fenugreek, Mixed Tocopherols (preservative).
Dose: Feed 30.5g daily (1 scoop = 30.5g)
💰 $54.68 ($0.98 / day) – 3.8-lb Bag (56 day supply)
💰 $104.16 ($0.93 / day) – 7.5-lb Bag (112 day supply)
Pros:
✔ Contains Vitamin E
✔ Promotes overall wellnes and vitality
✔ Convenient form to feed
Cons:
✘ Contains lower amounts of DHA than the products mentioned above
Guaranteed Analysis per 30.5 g:
| Ingredient Name | Amount Per Serving |
| Crude Protein (Min) | 15% |
| Crude Fat (Min) | 32% |
| Crude Fiber (Max) | 23% |
| Alpha-Linolenic Acid (an Omega 3 Fatty Acid) (Min) | 21% (6,500 mg) |
| Eicosapentaenoic Acid (EPA) (Min) | 1.5% (465 mg) |
| Docosahexaenoic Acid (DHA) (Min) | 1% (310 mg) |
| Oleic Acid (an Omega 9 Fatty Acid) (Min) | 5% (1,600 mg) |
| Linoleic Acid (an Omega 6 Fatty Acid) (Min) | 4% (1,300 mg) |
| Vitamin E (Min) | 1,500 IU |
EO-3™ Omega-3 Supplement by KER – ★3.9 (+80 reviews on Amazon and SmartPak)
A highly concentrated marine-derived omega-3 oil rich in EPA and DHA, designed to support joint, metabolic, immune, and reproductive health in horses.
The reason why the reviews are not as high as the others, is that people complain about their horses not eating it. So if this is your preferred product, please buy the smallest version or ask somebody that gives KER to their horses to let you try it with your horse, just in case.
Ingredients: Fish Oil, Mixed Tocopherols, Artificial Flavor
Dose: Top-dress 1 to 2 ounces per day on feed. For optimum results divide equally among feedings.
💰 $53.95 ($1.68 / day) – 32 oz Jug (32 day supply)
💰 $128.95 ($1.00 / day) – 1 Gal Jug (128 day supply)
💰 $589.95 ($0.92 / day) – 3 Gal Jug (640 day supply)
Pros:
✔ Research-backed by KER
✔ Excellent omega-3 source for reducing inflammation
✔ EO-3’s minty apple is four times as palatable as the original
✔ Omega-3 Omega-6 ratio 8:1
Cons:
✘ Some picky eaters refuse to eat it
| Guaranteed Analysis | Concentration | per 30 mL |
| Fat | 98% | 27.0 g |
| Omega-3 fatty acids | 32% | 5,800 mg |
| Eicosapentaenoic Acid (EPA) | 3,200 mg | |
| Docosahexaenoic Acid (DHA) | 2,300 mg | |
| Omega-6 fatty acid | 4% | 700 mg |
| Omega-3:Omega-6 ratio | 8:1 |
🔬 Why the Omega-3 to Omega-6 Ratio Matters
While both omega-3 and omega-6 fatty acids are essential for horses, maintaining the right balance is critical. Most modern equine diets—especially those high in grains, corn oil, or commercial feeds—are disproportionately high in omega-6s, which can promote pro-inflammatory responses when unbalanced. In contrast, omega-3s (particularly EPA and DHA) help counteract inflammation, supporting healthier joints, skin, and immune function.
There is no definitive answer yet, but research suggests that an ideal omega-3 to omega-6 ratio should be closer 4:1 – 6:1 as this is more or less the natural occuring ratio of fresh grassm alfalfa and clover, but when grass is cut, and turned to hay, most of the fatty acids oxidize. So many horses on conventional diets receive ratios as high as 1:20 or more. This imbalance can contribute to chronic inflammation and exacerbate joint or metabolic issues. Adding omega-3-rich sources—like flaxseed, chia, or marine oils—helps restore this balance, especially for performance horses, seniors, or those prone to arthritis.
Features I Look for in an Omega-3 Source
Not every horse needs the same Omega-3 source. My choices depend on a few really important factors: palatability, ease of storage, cost, and the horse’s individual needs. The most effective Omega-3s for joint support are those that get eaten consistently and match the horse’s work level and age. Whether in seed, oil, or pellet form, if the horse doesn’t eat it, you won’t see the benefits.
Safety is crucial. I always choose products from brands with transparent sourcing and where batch testing for purity is standard practice. With fish oil, I check that the label states “purified” and lists guaranteed levels of EPA and DHA. For seeds, I go for freshness and choose ground, stabilized products or grind my own in small amounts so there’s less risk of spoilage.
- Mild stiffness or general wellness? Flaxseed is my go-to for simplicity.
- Easy keeper or horse not doing too much exercise? Chia, because fish oil and flax have a bit too much fat.
- Traveling, competing, or need shelf-stability? Chia seeds win or commercial supplements tailored for your horse’s needs both work well.
- Dealing with severe joint issues or aging athletes? Fish oil offers stronger support or maybe a supplement that will contain fish oil, but also MSM, ASU, Boswellia, etc.
- Busy schedule or boarding barn? Commercial products are a lifesaver. Although there was one barn that they used a coffee grinder for their whole flax just before feeding time and made it work just fine.
Whatever the choice, consistency matters most. You won’t see results overnight—but within 4–8 weeks of daily feeding, improvements in movement and attitude often shine through.
Safety Tips for Best Results
- Store properly: Cool, airtight containers are a must for flax and oils. Even refrigeration, read labels.
- Introduce gradually: as long as you’re working with horses, do everything slowly.
- Watch for changes: Monitor movement, mood, coat condition, and appetite.
- Keep it balanced: Avoid oversupplementing, and always adjust to fit the full diet.
Supplementary Omega-3 fats must be fed on a daily basis to maintain effective circulating levels in the body and receive the full health benefits.
I have seen horses improve across all age groups, especially when a new Omega-3 source is introduced along with a balanced diet, regular exercise and honest turnout. It’s encouraging to hear from friends and fellow barn members who have success stories of their own, whether they use seeds, oil, or blended supplements. Tracking those changes over time makes a difference in picking the right plan and seeing ongoing improvement.
*Here’s a little transparency: Our website contains affiliate links. This means if you click and make a purchase, we may receive a small commission. Don’t worry, there’s no extra cost to you. It’s a simple way you can support our mission to bring you quality content **
References
- Banton, Sydney. “Fish Oil for Horses – Does This Supplement Work? [Research Review] | Mad Barn.” Mad Barn USA, 31 Mar. 2021, madbarn.com/fish-oil-for-horses/?srsltid=AfmBOoq7ZqZY4MM8TTAmmdNg-X3MIlGON8HBg8V-rafQQVUpqAtL6csy#ref11. Accessed 19 June 2025.
- Brennan, K M, et al. “336 the Effect of Dietary Microalgae on American Association of Equine Practitioners Lameness Scores and Whole Blood Cytokine Gene Expression Following a Lipopolysaccharide Challenge in Mature Horses.” Journal of Animal Science, vol. 95, no. suppl_4, 1 Aug. 2017, pp. 166–166, https://doi.org/10.2527/asasann.2017.336. Accessed 5 June 2025.
- Brennan, Kristen M., et al. “Effects of a Docosahexaenoic Acid–Rich Microalgae Nutritional Product on Insulin Sensitivity after Prolonged Dexamethasone Treatment in Healthy Mature Horses.” American Journal of Veterinary Research, vol. 76, no. 10, Oct. 2015, pp. 889–896, https://doi.org/10.2460/ajvr.76.10.889. Accessed 17 Nov. 2022.
- Elzinga, S.E., et al. “Effects of Docosahexaenoic Acid (DHA)-Rich Microalgae Supplementation on Metabolic and Inflammatory Parameters in Horses with Equine Metabolic Syndrome.” Journal of Equine Veterinary Science, Oct. 2019, p. 102811, www.sciencedirect.com/science/article/pii/S073708061930560X, https://doi.org/10.1016/j.jevs.2019.102811.
- Grimm, Pauline, et al. “Dietary Composition and Yeast/Microalgae Combination Supplementation Modulate the Microbial Ecosystem in the Caecum, Colon and Faeces of Horses.” British Journal of Nutrition, vol. 123, no. 4, 6 Nov. 2019, pp. 372–382, https://doi.org/10.1017/s0007114519002824. Accessed 12 Nov. 2020.
- Hess, T. M., et al. “Effects of Two Different Dietary Sources of Long Chain Omega-3, Highly Unsaturated Fatty Acids on Incorporation into the Plasma, Red Blood Cell, and Skeletal Muscle in Horses1.” Journal of Animal Science, vol. 90, no. 9, 1 Sept. 2012, pp. 3023–3031, https://doi.org/10.2527/jas.2011-4412.
- Hess, Tanja, and Trinette Ross-Jones. “Omega-3 Fatty Acid Supplementation in Horses.” Revista Brasileira de Zootecnia, vol. 43, no. 12, Dec. 2014, pp. 677–683, https://doi.org/10.1590/s1516-35982014001200008. Accessed 2 Mar. 2021.
- Melo, Diana, et al. “Chia Seeds: An Ancient Grain Trending in Modern Human Diets.” Food & Function, vol. 10, no. 6, 19 June 2019, pp. 3068–3089, pubmed.ncbi.nlm.nih.gov/31086922/, https://doi.org/10.1039/c9fo00239a.
- Motyka, Sara, et al. “The Current State of Knowledge on Salvia Hispanica and Salviae Hispanicae Semen (Chia Seeds).” Molecules, vol. 27, no. 4, 1 Jan. 2022, p. 1207, www.mdpi.com/1420-3049/27/4/1207, https://doi.org/10.3390/molecules27041207.
- “Omega 3s for Horses.” Platinumperformance.ca, 2022, www.platinumperformance.ca/articles/big-little-fats.html. Accessed 19 June 2025.
- Thomas, Jaime. “Feeding Flaxseed & Flax Oil to Horses | Mad Barn.” Mad Barn Canada, 18 Nov. 2022, madbarn.ca/flaxseed-for-horses/?srsltid=AfmBOoqe2huWf3hQaJnkpVWx7OlDAGg1_qRbCcLWja6EpHVPSrKYaI5S. Accessed 18 June 2025.