Trans-Resveratrol / Stilbenoid / Grape Skin Extract
A polyphenol from grape skin, red wine and blueberries, and an antioxidant in lab studies. It is often linked to sirtuin (SIRT1) longevity pathways, but that work is mostly in cells and animals. Human skin evidence is thin: most trials test it inside multi-ingredient products, and in the one trial of resveratrol on its own, the 1.5% cream alone did not reduce wrinkles over eight weeks. A reasonable antioxidant addition, not a proven anti-ager.
This concentration sits at or below the 1% line — that's expected and effective for this ingredient. Below the 1% line isn't automatically fairy-dusting; some ingredients genuinely work at low doses.
Topical 0.5–1% in serum or moisturiser, AM and/or PM. Pairs with Vitamin C, ferulic acid and Vitamin E.
Resveratrol is unusual among these ingredients in that most people meet it first as an oral longevity supplement, not a serum. Dietary resveratrol — the trace amounts in red wine, grapes and blueberries — is far too small to have any real skin effect (you could not drink enough wine to come close), which is exactly why it is sold in concentrated capsules. The SIRT1 and caloric-restriction-mimetic story described above comes largely from that supplement world.
The honest part is a hard one for resveratrol: its oral bioavailability is famously poor. Swallowed resveratrol is absorbed but then almost entirely metabolised on first pass — rapidly converted to glucuronide and sulfate forms — so very little intact resveratrol reaches the bloodstream, and less still reaches the skin. Much of the striking laboratory data comes from concentrations an oral dose cannot realistically achieve in living skin. Human evidence that oral resveratrol visibly improves skin is limited and emerging, not established: a textbook case of a molecule that looks spectacular in a dish and underdelivers in the body.
This is exactly why the topical route matters for skin. Applied directly at 0.5–1%, resveratrol bypasses first-pass metabolism and reaches the skin at useful concentrations — the better-supported way to get its antioxidant action and its synergy with Vitamin C where you actually want them. Oral resveratrol may still hold whole-body interest, but for the skin specifically, topical is the route with the clearer rationale. For the beauty-from-within context, see the Supplements & Ingestibles hub; for the antioxidant it pairs with, see Vitamin C.
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