Yamamoto Nutrition Caffeine TABS are a Vitamin B1 (Thiamine Hydrochloride) dietary supplement with caffeine. It contributes to normal energy metabolism. Coffee has hundreds of phytochemicals, some of which may offset the positive effects of Caffeine. However with pure Caffeine your desired dose can be taken without any possible interference. Our caffeine capsules allow you to take the desired amount in a convenient, precise and high dose.