10/30/2026
Five things I look at when choosing an omega-3
I used to assume that fish oils were pretty much the same. I've since learned that there's a lot more to consider than the amount of omega-3 printed on the label.
Here are five things I look at now.
1. The form
Fish oil commonly comes in triglyceride (TG) and ethyl ester (EE) forms. Research suggests that triglyceride forms can have somewhat better bioavailability in some circumstances, although the difference varies. The form alone doesn't tell you whether a product is good quality.
2. Freshness
Omega-3 fats are delicate and vulnerable to oxidation. A rancid or unpleasant smell or taste can be a warning sign, but smell alone cannot confirm whether an oil is fresh. Look for reliable oxidation testing and pay attention to storage instructions. Flavouring may improve the taste, but it doesn't reverse oxidation.
3. Proof of quality
Look beyond the front of the bottle. Does the company explain where its fish oil comes from? Does it provide information about contaminant testing and oxidation results?
TOTOX is one measure used to assess oxidation. It combines peroxide value and p-anisidine value. Some flavourings can interfere with p-anisidine testing, so it's important to understand how results for flavoured oils are measured and interpreted.
4. Protection of the oil
This is something I think deserves more attention.
Omega-3 fats are vulnerable to oxidation, so protecting the oil matters. Antioxidants such as olive polyphenols and tocopherols (vitamin E) can help protect oils from oxidative damage, although they don't make an oil oxidation-proof.
This is one reason I find the combination in BalanceOil+ interesting. It brings together fish oil from small wild-caught fish with extra virgin olive oil, naturally rich in polyphenols, and vitamin E.
It's not just about the omega-3s themselves. It's also about how the oil is protected.
5. Your own measurements
Taking an omega-3 supplement doesn't automatically tell you what's happening in your body. A fatty-acid test can give you a starting point and help track changes in measured fatty-acid levels and your omega-6:3 balance over time.
It isn't a diagnosis or proof of a health outcome, but it gives you information that you wouldn't have from looking at a supplement label alone.
For me, that last point changed the way I think about omega-3 nutrition.
Knowing what you're taking matters. Understanding what your own measurements show adds another piece of information.
If you're taking omega-3 right now, what made you choose the one you're using?