Sodium Hydroxide (also termed lye, caustic soda, and sodium hydrate) is a white solid that dissolves in water to produce a strongly alkaline solution. Both the solid and liquid forms can cause severe injury to all tissues. At room temperature, sodium hydroxide is a white crystalline odorless solid that absorbs moisture from the air. It is useful for its ability to alter fats. It is used to make soap and as a main ingredient in household products such as liquid drain cleaners. Sodium hydroxide is usually sold in pure form as white pellets or as a solution in water.

But when talking about the cosmetic usage of  Benefits of Sodium Hydroxide it has a significant role in skin care. Sodium Hydroxide for Skin - Balances and maintains product and skin pH levels: Happy skin is pH-balanced skin. By adjusting the pH of a formula, sodium hydroxide makes the formulation kinder on the skin. Maximizes product efficacy: Topical skin care products work best at a pH range of 4-6.

In a nutshell, Sodium hydroxide is a pH balancer used in a wide range of beauty and skin care items, like cleansers, soaps, makeup, and creams or lotions. In its pure form, sodium hydroxide is extremely harmful, but beauty and skin care products don't contain much sodium hydroxide, so they're safe to use.