AHAs, Salicylic Acid & Sun Sensitivity: Why the FDA Says Wear SPF
The exfoliating acids that clear your skin also make it easier to burn - and the FDA put that warning right on the label.
The FDA reports that AHA-containing products can increase sun sensitivity and the possibility of sunburn during use and for up to a week after stopping, and advises a sunburn-alert warning that recommends sunscreen and limited sun exposure.
The FDA states that products containing alpha hydroxy acids can make skin more sensitive to the sun, and recommends label warnings advising consumers to use sunscreen and limit sun exposure while using them and for a week afterward.
Questions we get a lot
Do AHAs make your skin more sensitive to the sun?
Yes. The FDA reports that AHA-containing products can increase sun sensitivity and the possibility of sunburn. This effect can last during use and for up to a week after you stop using the product, which is why the FDA advises a sunburn-alert warning recommending sunscreen.
Does salicylic acid (a BHA) also increase sun sensitivity?
The FDA addresses beta hydroxy acids, including salicylic acid, in its cosmetic-ingredient guidance. As a general precaution with exfoliating acids, using a broad-spectrum sunscreen and limiting sun exposure is recommended. Check individual product labels for specific warnings.
How long after using an acid exfoliant should I keep using sunscreen?
The FDA notes increased sun sensitivity from AHA products can persist for up to a week after you stop using them. The safest approach is to wear daily broad-spectrum sunscreen continuously while exfoliating and for at least a week after, and to limit direct sun exposure.
r/SkincareAddiction: 'Do I really need sunscreen the morning after using my AHA toner, or just on application days?'