Fitness basics
Learning Center
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.
High-dose vitamin C: Can it kill cancer cells?
High-dose vitamin C has been touted by some as an effective alternative cancer treatment.
High cholesterol treatment: Does cinnamon lower cholesterol?
Can cinnamon lower cholesterol?
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
HPV infection: A cause of cancer in men?
Learn what types of cancer HPV can cause in men and how you can reduce your risk.
Glucosamine: Does it protect cartilage in osteoarthritis?
Glucosamine manufacturers claim their products slow or stop cartilage damage in osteoarthritis.
Gallbladder cleanse: A 'natural' remedy for gallstones?
A gallbladder cleanse is a popular alternative remedy for gallstones. But does it work?
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