There is a labelling convention in the supplement industry that, while not technically dishonest, misleads almost everyone who reads it.

A bottle marked “Omega-3 1000mg” very likely contains only 180mg EPA and 120mg DHA. The rest is other fats from the fish. The 1,000mg is total fish oil — not the compounds that produce the benefits.

When clinical studies show omega-3 improving cardiovascular outcomes, the dose they measure is almost always combined EPA+DHA, not total fish oil.

What the Research Says

The American Heart Association’s 2019 scientific advisory on omega-3 and hypertriglyceridaemia, published in the Journal of the American Heart Association, identified meaningful triglyceride reduction at 1,000–4,000mg combined EPA+DHA per day.

A 2019 meta-analysis in JAMA found significant reductions in cardiac events with omega-3 supplementation, predominantly in studies using 840mg or more of combined EPA+DHA daily.

For cognitive applications, research on DHA specifically — including a 2010 study in Nutritional Neuroscience — used 400–900mg of DHA per day to observe effects on memory and processing speed.

The practical minimum for a healthy adult seeking systemic benefit: 1,200mg combined EPA+DHA per day. Many standard pharmacy fish oil products provide 300mg per serving. That is one-quarter of the threshold.

Why Bioavailability Makes This Worse

The 300mg figure above is already a best-case reading of a standard product. If that product uses ethyl ester form — which most do — actual absorbed EPA+DHA is lower still, given EE’s reduced bioavailability compared to TG form.

The gap between what the front of the pack implies and what the body receives is significant.

Reading a Label Properly

Before buying, check these things:

• EPA and DHA stated separately — not just “total omega-3”
• Combined EPA+DHA at least 600mg per capsule (2 capsules = 1,200mg)
• Form specified as triglyceride, rTG, or re-esterified triglyceride
• Antioxidant present (Vitamin E or rosemary extract)
• Third-party testing for heavy metals — fish are the raw material; mercury and lead testing matters

Frequently Asked Questions

Can I take too much omega-3?
At doses above 3,000mg EPA+DHA per day, mild blood-thinning effects become relevant for people on anticoagulants. For healthy adults, up to 3g daily is considered safe by EFSA and FDA guidelines.

Why does one product list “omega-3” and another list “fish oil”?
There is no uniform labelling standard. “Total fish oil” and “total omega-3” are both used for the same larger number. Look past both to the separate EPA and DHA figures in the supplement facts panel.

Should I take omega-3 with food?
Yes. Both TG and EE forms absorb better with dietary fat. Even a small amount of fat in the meal makes a meaningful difference.

I take one standard capsule a day. Is that worth continuing?
At approximately 300mg combined EPA+DHA in EE form, the effective absorbed dose is likely below 100mg. It is not harmful, but the evidence for benefit at that level is limited. A higher-quality product at the right dose would be a more purposeful choice.