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Vitamin B1, also known as thiamine, is found in many foods and has several important functions in the body. It helps metabolize fats and proteins, supports nervous system function and digestion, and helps the body use other B vitamins. Good sources include brewer's yeast, various vegetables, legumes, meats, eggs, and grains. A deficiency can cause fatigue, nausea, and abdominal cramps. Vitamin B1 has no toxicity even at high levels.
















