What it is
Potassium Hyaluronate is hyaluronic acid in which the acidic groups are neutralized with potassium, giving a salt form that is stable and easy to dissolve in water-based formulas. Hyaluronic acid is a glycosaminoglycan, a large sugar-based molecule found naturally in skin and connective tissue that can hold a great deal of water. In a sunscreen or moisturizer the salt form acts as a humectant, attracting and holding water at the skin surface to support hydration and a smoother feel. Cosmetic databases list its function as skin conditioning.
Safety & warnings
Hyaluronic acid and its salts are substances the skin recognizes and are generally regarded as well tolerated, including by sensitive skin, with irritation and allergy being uncommon. Potassium Hyaluronate works mainly as a surface humectant. In very dry climates, heavily humectant formulas can feel tight if not sealed with a moisturizer, but this is a usage tip rather than a safety concern.
Origin & sourcing
Hyaluronic acid occurs naturally in the body, where it is abundant in skin and joints. For cosmetics it is most often produced by microbial fermentation using bacteria, with older supplies extracted from animal sources such as rooster combs; the resulting hyaluronic acid is then converted to its potassium salt.
History
Hyaluronic acid was first isolated in 1934 by Karl Meyer and John Palmer from the vitreous humor of cattle eyes, and its name comes from the Greek word for glass-like, reflecting that source. Commercial production later shifted largely from animal extraction to bacterial fermentation to improve yield and avoid animal-derived material; salt forms such as the potassium salt are used in modern formulations.
Questions everyone asks
How is Potassium Hyaluronate different from hyaluronic acid?
It is the potassium salt of hyaluronic acid. The salt form is more stable and dissolves easily in water-based products, while delivering the same water-binding, hydrating benefit.
Is it the same as sodium hyaluronate?
It is very similar; both are salts of hyaluronic acid that act as humectants. Potassium hyaluronate uses potassium instead of sodium to neutralize the molecule.
What does it do in sunscreen?
It acts as a humectant, drawing and holding water at the skin surface to support hydration and a smoother, more comfortable feel.