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Using expired sour milk on your face probably seems like a recipe made in TikTok hell, but lactic acid is actually a chemical exfoliant that s gentle enough to treat acne and uneven texture on sensitive skin.
Luckily, there s no need to play around with the spoiled jug of milk that s been in the back of your fridge for months. Beauty brands have long been onto the benefits of lactic acid, safely incorporating it into their serums, creams, and masks.
But before you add any lactic acid products to your cart, we turned to a top dermatologist and chemist to get a full breakdown on what the chemical exfoliant does for your skin and the best methods for incorporating it into your routine.