A comprehensive guide to omega-3 fatty acid supplements: which form is best for reducing inflammation, for the heart, brain, and athlete recovery.

Omega-3 fatty acids (EPA and DHA) are among the most important supplements for athletes. They reduce systemic inflammation after intense training, improve cardiovascular function, support brain function, and may even increase muscle protein synthesis! It is believed that sufficient omega-3 intake can reduce muscle soreness (DOMS).
| Form | EPA/DHA Content | Absorption | Antioxidants | Price | Rating |
|---|---|---|---|---|---|
| Fish oil (TG form) | 30-50% | High | None (added) | Low | ★★★★★ |
| Krill oil | 15-25% | Very high (phospholipids) | Astaxanthin (natural) | High | ★★★★ |
| Algae oil | 30-50% | High (TG) | None | Medium-High | ★★★★★ for vegans |
| Ethyl esters (EE) | 50-70% | Lower | None | Low | ★★★ |
| Flaxseed oil | ALA only (0% EPA/DHA directly) | ALA->EPA conversion only ~5% | None | Low | ★ (not recommended alone) |
This is the natural omega-3 form found in fish. Absorption is 70-90% better than that of EE form. TG form is more expensive but more effective. Look for “triglyceride form” or “rTG” on the label.
Most common in cheap supplements. Absorption is poorer, especially on an empty stomach. EE form may oxidize faster. If the label only says “fish oil concentrate” without a reference to TG — it is most likely EE form.
Omega-3s in phospholipid form are absorbed better than TG. Plus, natural astaxanthin protects against oxidation. But EPA/DHA concentration is lower — more capsules are needed for the same effect.
A direct source of DHA and EPA (fish also get omega-3 from algae!). No fishy taste, no risk of contaminants. Ideal for vegans and pregnant women.
On omega-3 supplement labels, you will see three designations, and they are not equivalent: ALA (plant-based, short-chain), EPA and DHA (long-chain, the main ones for the human body).
Therefore, it is important to look not at the total amount of “fish oil” per capsule, but at the sum of EPA and DHA — the total oil amount may be large, while the active fatty acids may be low.
An additional practical aspect is oxidation: omega-3 oils are sensitive to light and heat, so old or improperly stored supplements may be spoiled (a sign is a bitter or “fishy” odor). Store in a cool, dark place.
Source: NSCA guide “Guide to Sport and Exercise Nutrition” (p. 62); Webb G. P., “Dietary Supplements and Functional Foods” (Blackwell, 2006); “Human Nutrition: 2020 Edition”.