Nutritional supplements
Learning Center
Flaxseed: Is ground better than whole?
Nutrition experts recommend ground flaxseed over whole flaxseed. Find out why.
Flu symptoms: Should I see my doctor?
See a healthcare professional if you are at high risk for complications from flu.
Food allergy vs. food intolerance: What's the difference?
Might you have to swear off milkshakes for good? Follow the symptom clues to find out whether you possibly have a food allergy or a food intolerance.
Frequent sex: Does it protect against prostate cancer?
Some studies have suggested that frequent ejaculation may reduce the risk of prostate cancer. But other research hasn't supported this idea.
GERD: Can certain medications make it worse?
Certain medications can aggravate symptoms of gastroesophageal reflux disease (GERD). Learn more.
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.
Heel spurs: Do they always cause pain?
Heel spurs — Bony growths not necessarily the cause of your heel pain.
How trauma can affect memory
In sexual assault survivors, the main traumatic event typically becomes encoded in memory. Less important details may not be as well retained in memory.
Hypothyroidism: Does it cause joint pain?
Hypothyroidism can cause muscle and joint problems, such as pain and stiffness.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
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