Nutritional supplements
Learning Center
Menopause hormone therapy: Does it cause vaginal bleeding?
Some forms of hormone therapy prescribed to ease hot flashes and other menopause symptoms may cause vaginal bleeding. Learn more.
Elective abortion: Does it affect subsequent pregnancies?
Understand if an elective abortion can affect your fertility or future pregnancies.
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.
Mononucleosis: Can it recur?
Mono can return in some rare cases. Learn why that happens.
Emerging treatments for multiple sclerosis
There is no cure for this disease of the nervous system, but promising research offers hope for new ways to slow and perhaps reverse the effects of this disease.
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.
Fundal height: An accurate sign of fetal growth?
Understand how fundal height is measured and what it means.
Bacterial vs. viral infections: How do they differ?
Understand the differences between bacterial and viral infections.
Male masturbation: Does frequency affect male fertility?
Male masturbation has little effect on sperm count or quality.
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?
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