Is Omega-3 legal in the United Kingdom?

Two large outcome trials reached opposite conclusions and the difference may be the placebo. Blood levels track strongly with living longer, supplements mostly do not, and the atrial fibrillation risk is real and dose-dependent.

Omega-3 is the most interesting evidence problem in this pillar because the literature contains a genuine, unresolved dispute rather than a simple null. One trial of 8,179 patients found a large reduction in cardiovascular events.

Mechanism: EPA and DHA incorporate into cell membrane phospholipids, displacing arachidonic acid and altering membrane fluidity and the substrate pool for eicosanoid synthesis. They are precursors to resolvins and protectins, which actively terminate inflammation rather than merely failing to promote it.

Regulatory history: Icosapent ethyl and omega-3-acid ethyl esters are FDA-approved prescription drugs for severe hypertriglyceridaemia, with icosapent ethyl carrying a cardiovascular risk reduction indication. Over-the-counter fish oil is a dietary supplement and is not approved to treat anything.

Licenses medicines for the UK market. A compound without a marketing authorisation is an unlicensed medicine, which can only lawfully be supplied for human use through a prescriber under the specials scheme, not sold as a research product.

The classification above is the The Longevity Archive reading of Medicines and Healthcare products Regulatory Agency listings for Omega-3 at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.