Folic acid (vitamin B9) is used in topical skincare as an antioxidant and skin-conditioning ingredient, with some research suggesting it may support skin renewal and help mitigate signs of environmental stress. Evidence for topical efficacy is limited compared to its established role in dietary supplementation.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or redness | Rare | Generally well tolerated topically; transient irritation possible in sensitive individuals. |
| Allergic contact dermatitis | Very rare | Isolated reports of sensitization to the ingredient or co-formulants. |
| Itching or stinging at application site | Rare | Usually mild and self-limiting. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.