1 x Natures Aid 100mg Vitamin B1 Thiamin Hydrochloride 90 Tablets. Each Natures Aid Vitamin B1 tablet provides 100 mg Thiamin and the first B-Vitamin to be discovered. Microcrystalline cellulose, di-calcium phosphate, thiamin as hydrochloride, anticaking agents vegetable source (magnesium stearate, silicon dioxide).