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How Much Do You Know About Vitamins?

Sometimes it's hard to keep your vitamin facts straight. How much vitamin A do you need? What's the best source of Vitamin C? And all those B vitamins—which one is which? Here's a quiz that offers a chance to learn something different about vitamins.

1. The time of day, season, where you live, your skin color, and how often you use sunscreen can all affect the amount of which vitamin your skin is able to make?
2. At one time, the disease rickets had all but disappeared from the U.S. Now, rickets is making a comeback. Which infants are most likely to get rickets?
3. Eating the liver of which animal can cause short-term (acute) vitamin A poisoning?
4. For a healthy pregnancy and baby, which nutrient can cause birth defects if the mother gets too little of it before and early in pregnancy?
5. Which is the leading cause of blindness in children worldwide?
6. The highest levels of vitamin C are found in which food?
7. In the U.S., who is most likely to develop scurvy (vitamin C deficiency)?