Nutritional supplements
Learning Center
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
What a newborn really looks like
Here's what to expect when you meet your baby for the first time.
What a newborn really looks like
Here's what to expect when you meet your baby for the first time.
What is a heart failure action plan?
Know when new heart failure symptoms require a call to a health care provider or an ER visit. A heart failure action plan can guide your self-care.
When cancer returns: How to cope with cancer recurrence
Learn what cancer recurrence means, and find out what you can do to cope when cancer returns.
Whooping cough
Learn more about the symptoms, causes, treatment of this highly contagious, vaccine-preventable lung infection.
Withdrawal method (coitus interruptus)
The withdrawal method — pulling the penis out of the vagina before ejaculation — isn't the most effective birth control. Learn about the pros and cons.
Wolff-Parkinson-White (WPW) syndrome
This heart condition present at birth causes a fast heartbeat. Rarely, it can cause sudden cardiac death. Know the symptoms and how it's treated.
X-linked agammaglobulinemia
This genetic disease weakens the immune system, mainly in males, and leads to having infections often.
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