The claimEvidence A · guideline-tier
Fish oil 1000 mg = 1 g EPA+DHA
The evidence
1000 mg is total fish oil weight; EPA+DHA is usually 300-500 mg. Read the actives, not the headline.
Why the claim spreads
Labels print the big '1000 mg fish oil' number, not the much smaller EPA+DHA actually inside — the headline number is what sells.
The mechanism, in brief
'Fish oil' isn't one thing — the forms on the market differ enormously, and the form directly drives absorption and safety.
Sources (1)
- National Institutes of Health, Office of Dietary Supplements. (2023). Omega-3 Fatty Acids — Fact Sheet for Health Professionals.