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Vitamin C is an antioxidant of the skin. The clinical literature mostly covers pure ascorbic acid, which only enters skin at a pH below 3.58 and remains unstable11. Our formulas use ascorbyl glucoside, a stabilized derivative judged safe by the CIR panel3, less documented in clinical research: the studies cited on it are few610.
Entry from our cosmetic ingredient glossary. Regulatory data from the European Commission's CosIng database12, safety of ascorbyl glucoside according to the CIR expert panel3. The Carmel catalog declares ascorbyl glucoside; most studies cover ascorbic acid, which is stated in each result.
Each result shows the protocol and the level of evidence. The higher the level, the better the result carries over to a finished formula.
The photoaging score improves on the vitamin C side, on the cheeks and around the mouth, and the biopsy shows more type I collagen. No sign of inflammation. Hydration improves on both sides4.
Treated skin looks smoother and less wrinkled, with measurable brightening. Hydration improves as much with placebo. Prolonged use is needed and the ideal concentration remains to be established5.
The sun spot pigmentation score drops at 24 weeks compared with placebo, and skin brightness improves from week 12, with no depigmenting effect. This is a related complex, not ascorbyl glucoside alone6.
Against daylight-induced pigmentation, 7% ascorbic acid ranks second after 4 days of irradiation. 2% ascorbyl glucoside is among the molecules compared, with no rank given in the abstract7.
Ascorbic acid only enters skin at a pH below 3.5, with an optimum at 20%. Levels saturate after three daily applications. Magnesium ascorbyl phosphate, ascorbyl palmitate and dehydroascorbic acid do not raise the skin's ascorbic acid content; ascorbyl glucoside was not tested8.
Vitamin C is one of the 23 cosmetic ingredients recommended by the panel, for fine lines and brown spots. The abstract does not specify the form of vitamin C12.
The reviews agree: ascorbic acid is unstable and hard to get into skin, hence derivatives designed for stability and absorption. Studies of these derivatives are mostly lab-based, and well-designed clinical trials are lacking91011.
Skin naturally contains a lot of vitamin C. This review compares dietary intake with topical application and notes that the efficacy of topical application remains poorly established for several effects13.
This page summarizes published literature on a cosmetic ingredient. It does not describe the effect of a finished product, which depends on its formula, and it is not medical advice. Several of the clinical trials cited were run or funded by cosmetics companies; this is indicated in the sources. Most studies cover ascorbic acid, not ascorbyl glucoside.
The concentrations cited mostly concern ascorbic acid: 7% in the skin tone comparison, 10% in the photoaging trial, 20% as the lab absorption optimum. Ascorbyl glucoside is compared at 2%. The final concentration of a formula is set with the formulator, depending on the form of vitamin C, the pH, the format and the target tolerance.
Our white label catalog includes 20 formulas with vitamin C: the key active in 9 of them, a supporting ingredient in the others. Every category can be customized (formula, fragrance, packaging).
Key active in serums, creams, radiance masks and cleansers, supporting active in scrubs and cream washes.
Key active in the body cream, also found in body milks and cream washes.
In our formulas, it is most often paired with
Panthenol 13Niacinamide 12Licorice extract 11Hyaluronic acid 7Aloe vera 6Four actives often compared when choosing the hero of a range. They do not exclude each other and are often combined in the same routine.
| Vitamin C | Niacinamide | Retinol | Hyaluronic acid | |
|---|---|---|---|---|
| Main role | Radiance, antioxidant protection | Barrier, skin tone, shine | Skin texture, fine lines | Surface hydration |
| When | Often in the morning | Morning and evening | In the evening | Morning and evening |
| In the formula | Ascorbic acid is unstable and needs a low pH; derivatives such as ascorbyl glucoside are more stable811 | Stable, easy to formulate in the water phase | Sensitive to light and oxidation | Stable, molecular weight changes the feel |
| EU regulation | No restriction12 | No restriction | Concentration limited since Regulation (EU) 2024/99614 | No restriction |
| Who it suits | Dull skin | General public, sensitive skin included | Experienced users, gradual introduction | All skin types |
Peer-reviewed studies and official regulatory sources, checked on November 2, 2026.
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