A category with two genuinely reasonable ingredients and a great deal of hopeful extrapolation from cell-culture studies.
"Anti-ageing" NAD precursors sold on lifespan claims, and high-dose biotin for hair — human lifespan data does not exist, and high-dose biotin interferes with common blood tests including the one used to diagnose heart attacks.
The single best-evidenced intervention for skin ageing is not a supplement.
It skews lab results in ways that have caused real misdiagnoses.
Skin turnover means nothing here shows up sooner.
We make no formula for skin. Nothing on this page earns us anything — which is worth knowing when you read the pages where we do have something to sell.