Grape Skin Polyphenol Extract
INCI: Vitis Vinifera Skin Extract
Standardised extract of grape skin, concentrating proanthocyanidins, anthocyanins, and resveratrol-adjacent stilbenoids. High-load antioxidant for anti-aging skincare.
Overview
Grape skin polyphenol extract is a standardised concentration of the polyphenol fraction from the skins of Vitis vinifera (wine grapes). It is closely related to but distinct from grape seed extract (which concentrates oligomeric proanthocyanidins, or OPCs, from the seeds) and grape seed oil (the cold-pressed lipid).
The skin-extract product concentrates a different bioactive mix: anthocyanins (the deep red-purple pigments), resveratrol and resveratrol-adjacent stilbenoids (piceatannol, viniferin), and a smaller share of proanthocyanidins than the seed extract. Cosmetic-grade product is usually standardised to 30%+ polyphenols.
The colour is deep red-purple. The extract is intensely pigmented even at low percentages, which is a formulation consideration — at 1%+ it will tint a cream noticeably pink-purple. For colourless formulations, the seed extract is the better choice.
Shelf life is 2-3 years stored cool, dark, and dry. In finished products, the polyphenol load is sensitive to light, oxygen, and high pH — use a chelator (EDTA, sodium phytate) to preserve activity.
What it does in a formula
Polyphenols from grape skin are powerful antioxidants, with mechanisms that include direct radical scavenging, metal chelation, and modulation of skin enzymes (matrix metalloproteinases, tyrosinase). The skincare research interest centres on:
- Anti-aging — protection against UV-induced damage and collagen degradation.
- Pigmentation — modest tyrosinase inhibition contributes to skin-tone-evening claims.
- Skin firmness — proanthocyanidins cross-link collagen and elastin, contributing to a “tightening” sensorial effect.
- Microcirculation — used in eye-area and leg-care formulas for the proanthocyanidin contribution to capillary support.
The resveratrol-adjacent stilbenoids (piceatannol, viniferin) carry their own research interest for skin elasticity and hyperpigmentation.
How to use
Add to the water phase or cool-down. The extract is heat-sensitive at high temperatures over long holds — for premium formulations, add below 40 C.
Usage rates by product type:
- Anti-aging face serums and creams: 0.5-2%
- Eye creams: 0.1-1%
- Anti-pigmentation serums: 0.5-2%
- Leg-care creams (vein-support positioning): 1-3%
- After-sun and antioxidant body lotions: 0.5-2%
Best paired with vitamin C, vitamin E, ferulic acid, and other antioxidants for a layered antioxidant stack.
Best for / Worst for
Best for: anti-aging face serums and creams, eye-area products with pigmentation focus, leg-care and circulation-positioned products, antioxidant stacks alongside vitamin C and E, premium “wine-grape” positioning.
Worst for: colourless or pale-cream formulations (the pink-purple tint shows through above 1%), high-pH formulas (polyphenols degrade above ~7.5), products packaged in clear bottles (light degrades the polyphenols rapidly).
Common pitfalls
Colour management. At 1-2%, grape skin extract gives a noticeable pink-mauve tint. For “premium clean” white serums, drop to 0.3% or switch to grape seed extract (much less pigmented).
pH stability. Polyphenols are most stable at slightly acidic pH (4.5-6.0). Above pH 7 they oxidise quickly. Don’t combine with alkaline ingredients without checking the final pH.
Light and oxygen. Package in opaque or amber bottles. Clear glass will dim the colour and reduce the bioactivity within months.
Chelator pairing. Polyphenols are easily oxidised by trace metals (iron, copper) leaching from packaging or water. Always include a chelator (EDTA at 0.1-0.2%, sodium phytate at 0.1-0.5%) in the formula.
Confusing with grape seed extract or grape seed oil. Three different ingredients, three different uses. Grape skin extract = polyphenol-rich, deep colour, anti-aging. Grape seed extract = OPC-rich, less colour, capillary/circulation focus. Grape seed oil = lipid carrier, light feel.
Substitutes
- Grape seed extract — fellow grape-derived polyphenol, less colour, more OPC-focused.
- Pine bark extract (Pycnogenol) — fellow proanthocyanidin extract, similar antioxidant load.
- Green tea extract (EGCG) — different polyphenol class, similar anti-aging positioning.
- Resveratrol (isolated) — concentrated stilbenoid, much higher cost, single bioactive.
- Pomegranate extract — fellow polyphenol-rich red-pigmented extract, different chemistry.