Cleopatra is legendary for many things—she was the last pharaoh of ancient Egypt, she was smart and stunningly beautiful, and she formed alliances with both ancient Rome's Julius Caesar and Mark Antony. She also bathed in milk, and that's also the stuff of legend since she was known for her beautiful skin. Cleopatra reportedly used donkey milk for her baths, and it's believed she also added honey and lavender to the milk, with scattered rose petals floating in her bath.
While it might seem like just a wasteful decadence, there's actually a reason why milk is good for your skin. The lactic acid in milk is an alpha hydroxy acid, which helps cleanse the skin and release dead skin cells. That allows the skin to rejuvenate itself more quickly, resulting in radiantly glowing, satiny smooth and soft skin.
Alpha hydroxy acids are commonly added to moisturizers, cleansers, toners, and masks and are good for the skin in the same way milk is—they act as an exfoliant. Over time, they are especially effective in decreasing the look of wrinkles and roughness. So taking a milk bath is the natural way to get these benefits for your skin—and from head to toe, at that.