Bariatric Advantage - Vitamin B-1 Thiamine (90 Count) Vitamins Bariatric Advantage Vitamin B-1 Thiamine, also known as vitamin B1, is part of the B-complex vitamins. Thiamine is important for converting energy from carbohydrates (sugars and starches) into energy for your cells. It is also important for the health of Your Price: $9.75 + Add to my saved list