Science
What Is Hypochlorous Acid?
Hypochlorous acid (HOCl) is a naturally occurring molecule that is produced by white blood cells and plays an important role in the human immune system. In skincare, it is gaining attention for its skin-soothing, balancing, and refreshing properties. Hypochlorous acid can be produced outside the body through the electrolysis of a saline (saltwater) solution, and it is used in cosmetics in very low concentrations — typically under 0.05%.
Naturally Recognized by the Skin
Because HOCl is a molecule already found in the body, it is naturally well-tolerated by the skin. It can be applied to sensitive or reactive skin without causing stinging or irritation, making it an excellent choice for calming skin discomfort.
HOCl is also known for its skin-conditioning benefits. It helps maintain the skin’s balance, supports its natural barrier function, and leaves the skin feeling fresh and revitalized.
Versatile Uses in Skincare
Hypochlorous acid can be used in a variety of cosmetic applications. Depending on the formulation, it can be used to:
- Calm and soothe irritated or stressed skin
- Reduce visible redness
- Refresh the skin after shaving or sun exposure
- Deodorize the skin after exercise
- Freshen feet, underarms, or even textiles and shoes
A Well-Studied Molecule
First identified in 1822, hypochlorous acid has been widely studied for its interaction with the body’s natural defense mechanisms. While it has been used for example wound care and disinfection settings, in cosmetics its role is to gently care for and soothe the skin. With advancements in manufacturing technology during the last decade, stable cosmetic formulations containing HOCl have become more accessible, opening new possibilities for minimal-ingredient, skin-friendly products.