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Vitamin B1 (Thiamin) 500 mg Tablets Vitamin B1 (Thiamin), is part of the group of essential nutrients known as the B Complex. B-Complex vitamins, including Vitamin B1, work to support energy metabolism in the body. Vitamin B1 is essential for a healthy nervous system and overall well being, providing the body nourishment for the occasional stress of daily living. This product offers essential B1 in a convenient vegetarian dosage form.