Nutritional supplements
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Valerian: A safe and effective herbal sleep aid?
Valerian — Can this sleep aid help you sleep better?
Answer
Vitamin D deficiency
What are the risks of too little vitamin D?
Answer
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Answer
Zinc for colds: The final word?
Everyone's heard of taking zinc for colds. But does it really work?
Answer
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