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Learning Center
White stool: Should I be concerned?
White stool may mean a serious liver problem. Learn about causes.
When to brush your teeth
When should you brush your teeth? Learn how to protect your oral health.
Wet macular degeneration
Blurred vision or blind spots could be a sign of this chronic eye disorder. Recognizing the warning signs could save your vision.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vitamin D deficiency: Can it cause high blood pressure?
Too little vitamin D is bad for the bones, but what about the heart? Learn how a low vitamin D level may affect blood pressure.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin B-12 and depression: Are they related?
Low levels of vitamin B-12 and other B vitamins may be linked to depression, but more research is needed.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
Video: Smoking — Anatomy of nicotine addiction
This animation illustrates how smoking changes your brain, causing nicotine addiction.
Video: How irritable bowel syndrome affects you
Watch this irritable bowel syndrome video to learn how IBS can affect you.
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