Nutritional supplements
Learning Center
Stomach flu: How long am I contagious?
Depending on which virus causes your stomach ailment, you can be contagious from a few days to two weeks or more.
Tanning beds: Safer than the sun?
Tanning beds don't offer a safe alternative to natural sunlight.
Test anxiety: Can it be treated?
Feelings of worry and self-doubt can interfere with how well you do on tests. Here's what you can do to lower your anxiety.
Tetanus shots: Is it risky to receive 'extra' boosters?
For adults, tetanus shots are recommended every 10 years.
Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
Uncircumcised penis: Is special care needed?
Know how to wash and care for your child's uncircumcised penis.
Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
Vaccines during pregnancy: Are they safe?
Find out which vaccinations you need while pregnant and which ones to stay away from.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
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