INGREDIENT · ANTIOXIDANT
Ferulic acid in skincare: what it does with vitamin C
Ferulic acid is rarely the headline on a serum, but it is the ingredient that made vitamin C serums last. The lab case for the pairing is strong; the evidence on ferulic acid by itself is thinner.
You may see it written as
- Ferulic Acid
What ferulic acid is and what it does
Ferulic acid is a widely occurring plant antioxidant.1 A 2025 systematic review found 18 human studies of topical ferulic acid, and reported that it was effective in improving one or more of skin redness, pigmentation, hydration, elasticity and texture, alone and in combination with other actives.2
The same review lists the limits: small sample sizes, little variety in skin types, a lack of robust randomised trials, and formulations that vary so much that ferulic acid's own contribution is hard to isolate.2 That last point matters most, because most products pair it with other ingredients.
Why it is paired with vitamins C and E
The pairing is the best-supported part of the story. In a 2005 study, adding ferulic acid to a solution of 15% L-ascorbic acid and 1% alpha-tocopherol improved the chemical stability of the vitamins and roughly doubled photoprotection to simulated sunlight, from about 4-fold to about 8-fold, measured by redness and sunburn cells. It also reduced thymine dimer formation.1
That is a laboratory-style measure of protection with one formulation, and it does not turn a serum into a sunscreen. It is also why ferulic acid is on the label of many vitamin C serums; see our vitamin C page for what that active does in people.
What a recent trial found
A 2026 split-face trial of 31 adults tested a serum with vitamins C, E and ferulic acid against a placebo serum, after microneedling on both sides, over 12 weeks. The antioxidant side improved more on a photoageing scale (23.9% against 6.8%).3 Microneedling was part of the protocol and the serum had three actives, so it cannot isolate ferulic acid. Two of its authors work for a skincare company.3
Using ferulic acid with other products
The vitamin C pairing has direct evidence, and it is a stability and photoprotection finding in a specific formulation.1 The review also found ferulic acid effective in combination with other actives,2 but we did not find a study of layering it with other actives as separate products.
Ferulic acid in pregnancy and breastfeeding
We found no pregnancy- or lactation-specific evidence for this ingredient.
Evidence on cosmetic products in pregnancy is limited overall, so ask your doctor or midwife about the specific product you use.4
What you will see on the label
On a label, look for Ferulic Acid. Snifff shows it as Low risk. For the rest of the formula, see what the score means and how to read the list.
As Snifff shows itFerulic Acid
Pregnancy and nursing
We found no pregnancy- or lactation-specific evidence for this ingredient.
Wording as it appears in the extension, which can change between releases.
A FEW MORE ANSWERS
Common questions about ferulic acid
Why is ferulic acid in vitamin C serums?
In a 2005 study, adding ferulic acid to vitamins C and E improved their stability and doubled photoprotection in skin, from about 4-fold to 8-fold.1
Does ferulic acid work on its own?
A 2025 systematic review of 18 human studies found benefits, but studies were small and few were randomised trials, and many tested ferulic acid in combination with other actives.2
Can ferulic acid replace sunscreen?
No source we cite tested it as a replacement. The 2005 study measured protection in a laboratory-style model, with vitamins C and E.1
Is ferulic acid safe in pregnancy?
Snifff found no pregnancy-specific evidence for Ferulic acid. Ask your doctor or midwife about the product you use.
WHERE THIS COMES FROM
Sources
- Ferulic acid stabilizes a solution of vitamins C and E and doubles its photoprotection of skinLin FH, Lin JY, Gupta RD, Tournas JA, Burch JA, Selim MA, Monteiro-Riviere NA, Grichnik JM, Zielinski J, Pinnell SR · Journal of Investigative Dermatology · 2005
- Ferulic acid use for skin applications: a systematic reviewRoux J, Horton L, Babadjouni A, Kincaid CM, Mesinkovska NA · Journal of Clinical and Aesthetic Dermatology · 2025
- A double-blinded, split-face clinical trial evaluating the effects of a vitamin C, E, and ferulic acid serum combined with microneedling on facial photoagingLiu C, et al. · Clinical, Cosmetic and Investigational Dermatology · 2026
- Cosmetic dermatology in pregnancy and lactation: a risk-benefit framework for clinical practiceKovacs T, et al. · International Journal of Dermatology · 2026
This page explains an ingredient. It is not medical advice, and it is not an assessment of any product. If you are pregnant, breastfeeding, or have a skin condition, ask your doctor or pharmacist.