Is Pioglitazone legal in the United Kingdom?

An approved diabetes drug with real cardiovascular outcome data in people, and the only compound in the 2026 mouse cohort that shortened female lifespan in the analysis that survived removing an outlier site.

Pioglitazone is an unusual entry because its human record is strong and its ageing record is negative, and both deserve saying in the same breath. In people it is an approved insulin sensitiser with a genuine outcome trial behind it, which most things on this site do not have.

Mechanism: An agonist at peroxisome proliferator-activated receptor gamma, a nuclear receptor expressed most highly in adipose tissue. Activating it drives differentiation of new small insulin-sensitive adipocytes, redistributes lipid away from liver and muscle, and lowers circulating free fatty acids, which is how it improves whole-body insulin sensitivity.

Regulatory history: FDA-approved as Actos for type 2 diabetes. Carries a boxed warning for congestive heart failure. Not approved for any ageing or longevity indication.

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 Pioglitazone 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.