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

Find out what dietary supplements are and what they do in your body.

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

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

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