What it is
Thiamine HCl is the stable, water-soluble hydrochloride salt of thiamine, also known as vitamin B1. In cosmetics it is included as a skin-conditioning ingredient, often as part of vitamin-themed blends in skincare and sun care formulas. The hydrochloride form is used because it is more stable and soluble than free thiamine.
Safety & warnings
Generally regarded as well tolerated in topical cosmetic use. It is not a recognized fragrance allergen and is non-comedogenic; reactions are uncommon.
Origin & sourcing
Manufactured for cosmetic use, typically by chemical synthesis; thiamine itself is an essential vitamin found naturally in many foods.
Questions everyone asks
Is thiamine HCl the same as vitamin B1?
Yes. Thiamine is vitamin B1, and thiamine HCl is its hydrochloride salt, a more stable and water-soluble form used in formulas.
What does it do in skincare?
It is used as a skin-conditioning ingredient, frequently as part of multi-vitamin blends, and does not provide UV protection.