Nutritional supplements
Learning Center
Yeast infection during pregnancy: Over-the-counter treatment OK?
Yeast infections are common during pregnancy. Over-the-counter treatments are usually safe.
X-ray during pregnancy: Is it safe?
Learn when an X-ray during pregnancy might cause harm and how to avoid it.
Wheezing in children: Could it be asthma?
Wheezing in children may be a sign of asthma — but not always.
What is wheatgrass? Why is it in my drink?
Wheatgrass is a popular addition to smoothies and other drinks. While it's a rich source of nutrients, it's not a disease cure-all.
Weight loss: Better to cut calories or exercise more?
Understand how calorie restriction and exercise help you meet weight goals.
Water retention: Are there natural diuretics?
Interested in natural diuretics for fluid retention and weight gain? You may be better off watching your diet.
Warm-mist versus cool-mist humidifier: Which is better for a cold?
Warm-mist and cool-mist humidifiers are equally effective in humidifying the air.
Warfarin diet: What foods should I avoid?
Certain foods and drinks may affect how the blood thinner warfarin works. Know which foods and beverages are OK when you're taking the medicine.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vitamin D deficiency
What are the risks of too little vitamin D?
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