Nutrition basics
Learning Center
Valerian: A safe and effective herbal sleep aid?
Valerian — Can this sleep aid help you sleep better?
Varicocele
Find out how this condition involving the enlargement of veins in the scrotum can affect sperm quality and production.
Vasectomy
Find out more about this procedure that provides nearly 100 percent effective male birth control by cutting the supply of sperm to semen.
Vasectomy reversal
Learn about this microsurgery procedure that can restore your fertility after a vasectomy.
Water: How much should you drink every day?
Know how much water to drink to stay healthy and hydrated.
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.
Yerba mate: Is it safe to drink?
This herbal tea may help you feel more alert and focused, but find out what the possible health risks are.
Zinc for colds: The final word?
Everyone's heard of taking zinc for colds. But does it really work?
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