Nutritional supplements
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Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
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
What is thirdhand smoke, and why is it a concern?
Tobacco smoke creates toxic residue that clings to walls, carpets, clothes and other surfaces.
Answer
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