Sour Milk Skincare? Here’s How Lactic Acid Gives Your Skin a Major Glow-Up

Spoiled milk probably sounds like the last thing you want to put on your face, right? Well, it turns out it’s actually pretty beneficial. Yet another addition to the bizarre (yet effective) skincare ingredient canon, lactic acid—a natural exfoliating acid found in rotten milk—is actually a mild Alpha Hydroxy Acid (AHA) that improves texture, nixes hyperpigmentation and scars, and soften the appearance of fine lines. Unlike many members in the AHA family, lactic acid is a much more gentle agent, allowing you to reap the unparalleled anti-aging benefits you’ll get from, say, a glycolic acid, but with much more gradual results and therefore, less irritation, peeling, and redness.

The best part is that you don’t have to...

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