Nutritional supplements
Learning Center
Vitamin D deficiency
What are the risks of too little vitamin D?
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
COVID-19 variants: What's the concern?
The virus that causes COVID-19 has changed over time, which has affected prevention, diagnosis and treatment of COVID-19.
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Diuretics and gout: What's the connection?
Diuretics and gout can be related because the medication may raise uric acid in your blood. It's usually possible to avoid this side effect, though.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
Thin skin? Added protection helps
Fragile or thin skin is a fairly common problem, especially in older adults.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Testosterone therapy in women: Does it boost sex drive?
This type of hormonal therapy may boost sex drive for some women, but its long-term safety is unclear.
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