Vitamin B1 Thiamine HCl is a salt formed by the combination of thiamine with hydrochloride. It is a water-soluble and fat-soluble compound, essential for the body to maintain a proper metabolic rate. Taken as an oral supplement, this powder enhances memory power and accelerates recovery after workout. Thiamine HCl boosts energy, increases red blood cells, and lowers hormones causing stress in the body.