What it is
Arginine HCl is the hydrochloride salt form of arginine, a naturally occurring amino acid. In formulas it serves as a skin-conditioning and water-binding ingredient and is also used to help adjust and stabilize pH. Its salt form gives it good water solubility and convenient handling in aqueous systems.
Safety & warnings
Amino acids such as arginine and their salts are generally well tolerated and non-irritating at cosmetic use levels. It is water-soluble and is not considered comedogenic.
Origin & sourcing
It is typically produced commercially by microbial fermentation to yield L-arginine, which is then converted to its hydrochloride salt.
Questions everyone asks
Why is arginine HCl in a sunscreen?
It conditions and hydrates the skin and can help buffer the formula's pH; the salt form dissolves readily in water-based products.
Is it different from plain arginine?
It is the hydrochloride salt of arginine, which improves solubility and handling while providing the same amino acid.