Does AHA make your skin more sensitive to the sun?
Yes — AHAs raise UV sensitivity, so wear SPF daily. An FDA-commissioned study confirmed increased sun sensitivity for up to 7 days after use. Apply broad-spectrum SPF 30 or higher every morning, even if you only use AHAs at night.
Why
AHAs remove the outermost dead cell layer, exposing fresher skin with less built-up UV protection. Published studies (including an FDA-commissioned study on glycolic acid) have confirmed increased UV sensitivity lasting up to 7 days after AHA use.
What to do
Apply broad-spectrum SPF 30 or higher every morning when using AHAs in your routine. This applies even if you only use AHAs at night.
Good to know
The FDA commissioned a study (2005) confirming a statistically significant increase in UV sensitivity from AHA use. The finding applies to glycolic and lactic acid particularly. This is why many AHA products carry SPF advisory language on their packaging.
Sources
SkinMama provides skincare information for educational and cosmetic self-care purposes only. It is not medical advice and does not diagnose, treat, or replace a dermatologist. For a medical concern, consult a qualified professional.