Nutritional supplements
Learning Center
Vulvar varicosities during pregnancy: What can you do?
Vulvar varicosities can cause discomfort during pregnancy. Understand what causes this form of varicose veins and learn how to get relief.
Von Willebrand disease
Learn more about the symptoms, causes, diagnosis, treatment of this inherited bleeding disorder in which blood doesn't clot well.
Vocal cord dysfunction: Is it a type of asthma?
Vocal cord dysfunction and asthma cause similar symptoms, but they're not the same. Find out the difference between the two.
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.
Video: Migraine aura
A migraine aura is usually visual, but can also be a sensory, motor or verbal disturbance. This animation shows what happens when you have a migraine aura.
Video: Keratoconus
Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.
Video: An asthma attack
What happens to your airways during an asthma attack?
Ventricular fibrillation
Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the symptoms of VFib and what actions to take to save a life.
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