Nutritional supplements
Learning Center
What is wheatgrass? Why is it in my drink?
Wheatgrass is a popular addition to smoothies and other drinks. While it's a rich source of nutrients, it's not a disease cure-all.
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin C: An essential nutrient
Vitamin C is a water-soluble vitamin that supports normal growth and development and helps your body absorb iron. Because your body doesn't produce or store vitamin C, it's important to include vitamin C in your diet. For most people, an orange or a cup of strawberries, chopped red pepper, or broccoli provides enough vitamin C for the day.
Virtual colonoscopy
Unlike other colon cancer screening tests, this imaging test doesn't use a scope to examine your colon. Learn how it works and what to expect.
Video: Skin cancer — How skin cancer develops
Watch this video to see what melanoma and nonmelanoma skin cancers look like and how they develop.
Video: Sentinel node biopsy for melanoma
Video shows sentinel node biopsy to determine whether melanoma has spread.
Video: Mammogram for breast cancer — What to expect
Watch video to see what it's like to have a mammogram, or breast cancer detection exam.
Video: HSG test for female infertility
Video animation shows the HSG test — an X-ray study to identify causes of female infertility.
Video: Endoscopy
An endoscopy allows your doctor to view your esophagus, stomach and part of the small intestine. Here's how it works.
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