Parents report that they have been giving a multivitamin to their 1-year-old infant. The nurse counsels the parents that which vitamin can cause a toxic reaction at a low dose?
a. Niacin
b. B6
c. D
d. C
ANS: C
Hypervitaminosis of vitamin D presents the greatest problem because this fat-soluble vitamin is stored in the body. Vitamin D is the most likely of all vitamins to cause toxic reactions in relatively small overdoses. The water-soluble vitamins, primarily niacin, B6, and C, can also cause toxicity but not at the low dose that occurs with vitamin D.
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