What resveratrol is
Resveratrol is a stilbene polyphenol that plants produce when attacked by fungi or UV. It is concentrated in grape skins, blueberries, peanuts and the roots of Japanese knotweed, which is the usual commercial source. It became famous through research on red wine and longevity; the skincare interest comes from the same antioxidant chemistry.
What it does on the skin
- Direct antioxidant. It scavenges the free radicals generated by UV and pollution that break down collagen.
- Indirect antioxidant. It activates the skin's own defense pathways (including sirtuin-1 and Nrf2), so cells produce more of their protective enzymes.
- Calming. It reduces inflammatory signalling, which is useful for redness-prone skin.
- Supports collagen. In fibroblast studies it increases collagen production and slows the enzymes that degrade it.
What the evidence looks like
The cellular evidence is extensive. Human evidence is smaller: a 12-week study of a 1% resveratrol formula with vitamin E and baicalin reported improved firmness, radiance and reduced fine lines; other small trials show better hydration and reduced redness. Fair summary: a well-supported antioxidant that strengthens a routine, not a stand-alone wrinkle treatment. Its weakness is stability, so it belongs in an opaque, airless container and in a formula with other antioxidants.
How IKI uses it
Izumi Skin Regenerating Serum pairs resveratrol with copper tripeptide-1, niacinamide, multi-weight hyaluronic acid and a low level of lactic acid, in a fragrance-free night serum with no retinol. In its independent 30-day study on 46 people with sensitive skin, 93% said it felt gentle and 87% said their skin looked more glowing.
