What it is
Folic acid is the stable, synthetic form of vitamin B9, a water-soluble nutrient. In topical formulations it is included as a skin-conditioning agent and is marketed for its antioxidant-supporting properties. It is typically used at low concentrations within hydrating or brightening sunscreen bases.
Safety & warnings
Folic acid is generally well tolerated on skin at the low levels used in cosmetics and is not associated with significant irritation or sensitization. It is water-soluble and not considered comedogenic.
Origin & sourcing
Folic acid used in cosmetics is almost always produced by chemical synthesis to ensure stability and purity, though the vitamin occurs naturally in leafy green vegetables, legumes, and liver.
Questions everyone asks
What does folic acid do in a sunscreen?
It acts as a skin-conditioning agent and contributes antioxidant support within the formula, often paired with hydrating or brightening ingredients.
Is topical folic acid the same as the dietary supplement?
It is the same molecule, vitamin B9, but in cosmetics it is used at low levels in the formula for skin conditioning rather than as a nutritional source.