Guidelines
Though AHAs are safe to use on skin, there are some guidelines set forth by the Food and Drug Administration for its use. They include the stipulation that the product containing AHAs contain a concentration of 10% or less of the AHA.
When you use an alpha hydroxy acid product, you make your skin more vulnerable to damage from the sun. It’s recommended that if you use an AHA product, you also use a high-quality sunscreen to protect your skin from the sun. To that end, the FDA also recommends that products containing AHAs either contain sunscreen, or a warning telling users to use sunscreen while using the product.