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Find out what dietary supplements for exercise and athletic performance are, what they do in your body, and about exercise and athletic performance supplements.

Find out what biotin is and what it does in your body, what foods provide it, and about biotin supplements.

Find out what vitamin D is and what it does in your body, what foods provide it, and about vitamin D supplements.

Find out what vitamin A is and what it does in your body, what foods provide it, and about vitamin A supplements.

Find out what vitamin A is and what it does in your body, what foods provide it, and about vitamin A supplements.

Find out what vitamin B6 is and what it does in your body, what foods provide it, and about vitamin B6 supplements.

Recommended intakes and sources of calcium, effects of deficiency and excess, groups at risk of inadequacy, and interactions with medications.

Find out what thiamin is and what it does in your body, what foods provide it, and about thiamin supplements.