Nutritional supplements
Learning Center
Does sunscreen expire?
Wondering whether sunscreen expires? Get the facts about how long sunscreen lasts.
Baby poop: What to expect
Infant stool can have various colors and textures. Know what to expect in your newborn's diapers.
Sitting risks: How harmful is too much sitting?
Sitting for long periods — such as in front of the TV or at a desk — appears to increase risk of death from cardiovascular disease and cancer.
Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
High-dose flu vaccines: How are they different from other flu vaccines?
High-dose flu vaccines are flu vaccines for older people.
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?
Heart attack prevention: Should I avoid secondhand smoke?
It's possible that secondhand smoke can irritate the arteries and increase the risk of a heart attack.
Croup
This upper airway infection makes it harder to breathe and causes a barking cough. It involves swelling around the voice box, windpipe and bronchial tubes.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Dental floss vs. water flosser: Which is better?
Cleaning between your teeth every day is an important part of good oral health.
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