Nutritional supplements
Learning Center
Swallowing gum: Is it harmful?
Your body can't digest chewing gum. So what happens when you swallow it?
Strep throat in young children: A common diagnosis?
Strep throat in young children is uncommon, but it's possible. Learn about symptoms.
Spastic colon: What does it mean?
This term is sometimes used to refer to irritable bowel syndrome (IBS) — but how accurate is it?
Scalp psoriasis vs. seborrheic dermatitis: What's the difference?
Learn how to tell apart these common conditions of the scalp, both of which cause inflamed, scaly skin.
Reactive hypoglycemia: What can I do?
Reactive hypoglycemia is low blood sugar that happens after eating.
Probiotics and prebiotics: What you should know
Probiotics are foods or supplements that contain 'good' bacteria that might help treat or prevent illness. Should they be part of your diet?
Prenatal vitamins: OK for women who aren't pregnant?
Prenatal vitamins: Why they might not be suitable if you're not pregnant.
Premenstrual dysphoric disorder: Different from PMS?
Extreme moodiness, intense sadness or marked irritability in the days before your period — along with your usual PMS symptoms — could be PMDD.
Poppy seed tea: Beneficial or dangerous?
Poppy seed tea may be used as a natural pain reliever. The key is the opioids in the seed coating, which may be dangerous.
Passive-aggressive behavior: What are the red flags?
Learn about the signs of this indirect way of expressing negative feelings.
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