Cleopatra used sour milk and yogurt as facial masks to maintain glowing skin.

Historical records and archaeological findings suggest that Queen Cleopatra VII of Egypt, who reigned from 51 to 30 BC, utilized fermented dairy products as a cornerstone of her beauty regimen. The primary active ingredient in sour milk and yogurt is lactic acid, which belongs to the family of alpha-hydroxy acids (AHAs). These organic compounds are widely used in modern dermatology for their ability to break down the 'glue' that holds dead skin cells together.When applied to the skin, lactic acid promotes cell turnover and stimulates the production of collagen. This process helps reduce the appearance of fine lines and hyperpigmentation, which explains why ancient royalty prized it for a youthful glow. Modern studies, such as those published in the Journal of the American Academy of Dermatology, confirm that AHAs like lactic acid improve skin texture and hydration levels significantly.Beyond Egypt, other ancient civilizations also recognized these benefits. For instance, women in the French court during the 18th century were known to apply aged wine or crushed grapes to their faces for the tartaric acid, another form of AHA. Cleopatra's specific use of donkey milk was particularly effective because it has a higher concentration of vitamins and minerals compared to cow milk. This ancient practice laid the scientific foundation for the chemical peels and exfoliating serums used in professional skincare clinics today.