Antioxidants in skincare: tocopherol, ferulic acid, resveratrol, green tea – and the ones that protect the formula
Some antioxidants are there for your skin, others mainly to stop the cream from going rancid – and some do both. How to recognise Tocopherol, Ferulic Acid, Resveratrol, green tea extract, BHT or rosemary extract on an INCI list and what their position tells you.
Updated: 31 October 2026 · Reviewed by: Kamil Pyziak
Two jobs for one word
Oxidation is a chemical reaction with oxygen, often driven by light, heat or traces of metals. In a jar, it makes oils go rancid, changes the colour and smell of a product and can break down sensitive ingredients. On the skin, UV radiation and air pollution generate reactive molecules often called free radicals. Antioxidants are substances that react with these species or interrupt the chain reactions they start.
In cosmetics, antioxidants therefore play two roles. Some are added mainly to protect the formula and are used in small amounts. Others are promoted as skin-care ingredients, with claims about protecting the skin from environmental stress. The same molecule can do both; what differs is usually the amount and the way the product is marketed. In CosIng, the function “antioxidant” refers to protecting the product itself.
Vitamin E: Tocopherol and Tocopheryl Acetate
Vitamin E appears on ingredient lists mainly as Tocopherol (the free form, often a mixture of tocopherols from vegetable oils) or as Tocopheryl Acetate (an ester). Tocopherol is one of the most common formula antioxidants: a small amount in a plant oil or a balm slows down rancidity. That is why it is found even in products that do not advertise vitamin E.
Tocopheryl Acetate is more stable in the product, which makes it popular in creams and lotions that claim to contain vitamin E. How much of it is converted into free tocopherol in the skin has been debated. Both forms are oil-soluble and are often combined with other antioxidants.
Ferulic acid and the vitamin C connection
Ferulic Acid is a plant phenolic compound found, for example, in the cell walls of grains such as rice and wheat bran. In skin care it became well known through serums combining vitamin C (Ascorbic Acid), vitamin E (Tocopherol) and ferulic acid; laboratory studies of such combinations reported that ferulic acid helped stabilise the vitamins and contributed to their effect.
Like vitamin C, ferulic acid works best in carefully formulated products, often with a low pH and packaging that limits light and air. A change in colour – for example a serum turning from pale yellow to orange or brown – is a sign of oxidation. Whether a product with these three ingredients matches the tested combinations depends on concentrations that the label does not show.
Resveratrol, green tea and other plant polyphenols
Resveratrol is a polyphenol known from grapes and red wine. Cosmetic resveratrol is often obtained from Japanese knotweed (Polygonum Cuspidatum Root Extract) or made synthetically. It is poorly soluble in water and sensitive to light, which makes it demanding to formulate. Camellia Sinensis Leaf Extract (green or white tea) contains catechins such as EGCG, and Vitis Vinifera Seed Extract (grape seed) contains proanthocyanidins.
Coloured antioxidants are easy to spot in the jar: Astaxanthin, a carotenoid often obtained from the microalga Haematococcus pluvialis, is deep red, and Ubiquinone (coenzyme Q10) is yellow-orange. For plant extracts, the INCI name does not say how concentrated the extract is or how much of the active polyphenols it contains.
Antioxidants that protect the formula
Many ingredient lists contain small amounts of antioxidants that you would hardly notice: BHT (butylated hydroxytoluene), Ascorbyl Palmitate (a fat-soluble form of vitamin C), Tocopherol and Rosmarinus Officinalis Leaf Extract (rosemary extract), which is popular in natural cosmetics. Hair dyes often contain Sodium Sulfite to protect the dye molecules.
Chelating agents support them indirectly. Disodium EDTA, Tetrasodium Glutamate Diacetate or Sodium Phytate bind traces of metal ions from water or raw materials, which would otherwise speed up oxidation. These ingredients are usually near the end of the list, which is normal for protective helpers.
Antioxidants and sun protection
Antioxidants do not absorb or reflect UV radiation in the way UV filters do, so they do not provide an SPF. A day cream with green tea or vitamin E is not a sunscreen unless it contains UV filters and states an SPF.
Some sunscreens and day creams combine UV filters with antioxidants. In such products, the antioxidants are an addition, not a replacement; the level of UV protection is defined by the SPF and the UVA logo or statement on the pack.
What the label does not tell you
The INCI list does not show how much of an antioxidant a product contains, whether it was added to protect the formula or to act on the skin, or how much of it is still active after months on the shelf and weeks after opening. Packaging matters: opaque, airless or pump containers protect sensitive antioxidants better than open jars.
Claims such as “anti-pollution”, “protects against free radicals” or “anti-ageing” are the brand’s wording. If you have specific concerns about sun damage or skin changes, a dermatologist is the right person to ask.