Sleep
Learning Center
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Melatonin side effects: What are the risks?
Melatonin is generally safe for short-term use but can cause side effects.
Measles vaccine: Can I get the measles if I've already been vaccinated?
Is it possible to get measles from someone else if you've been vaccinated?
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Loss of sex drive in men: Natural with aging?
Age-related loss of sex drive is normal, but sometimes an underlying condition is at play.
L-arginine: Does it lower blood pressure?
This supplement may help some people lower their blood pressure. Learn who might benefit and who should stay away from it.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
How to treat a piercing site infection
Learn what you can do at home if your ear new piercing becomes infected.
How many hours of sleep are enough?
Wonder how many hours of sleep are enough? A Mayo Clinic specialist offers guidelines.
High-dose vitamin C: Can it kill cancer cells?
High-dose vitamin C has been touted by some as an effective alternative cancer treatment.
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