B-1 500mg 100 capsules by Twinlab B-1 (Thiamin) is part of the co-enzyme system which helps metabolize carbohydrates, maintains healthy skin, mouth, eyes, hair, essential for normal function of the heart, nerve tissues, muscles, digestion, learning capacity, mental illness and memory. B-1 500mg Research: Crystalline Pure, Yeast Free Well tolerated by most highly allergic individuals. Twinlab B-1 Caps are easier to swallow and assimilate. B-1 500mg Directions/Usage: As a dietary supplement, one or more capsules daily. Keep tightly closed in a cool, dry place.