Sleep
Learning Center
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
What are your sleep busters?
For better health, make sleep a priority. Start by identifying and confronting challenges to a good night's sleep. Includes tips for better sleep.
White stool: Should I be concerned?
White stool may mean a serious liver problem. Learn about causes.
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.
Yeast infection in men: How can I tell if I have one?
Yeast infections can occur in men, causing inflammation of the penis (balanitis). Learn what signs and symptoms could mean you have a yeast infection.
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