Nutritional supplements
Learning Center
Flu vaccine: Safe for people with egg allergy?
If you have egg allergy, you still may be able to receive the flu vaccine.
Flu mask: Should I wear one?
Influenza masks and hand hygiene might help protect healthcare workers from flu (influenza).
Stomach flu: How long am I contagious?
Depending on which virus causes your stomach illness, you can be contagious from a few days to two weeks or more.
Cold and flu viruses: How long can they live outside the body?
Some viruses are more resilient than you may think. Learn more about how they spread and how to protect yourself.
Does sunscreen expire?
Wondering whether sunscreen expires? Get the facts about how long sunscreen lasts.
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.
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