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Vitamin B12 (cobalamin) is a vital nutrient that plays a crucial role in maintaining healthy nerves, red blood cell production, DNA synthesis, and even the health and vibrancy of your skin

For hematocrit and reticulocyte counts, recommendations are to repeat these tests daily from the 5th to 7th days of treatment and then frequently until the hematocrit returns to a normal range (11, 14, 15)

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Horovitz regularly writes for The New York Times, The Wall Street Journal, The Washington Post, Investors Business Daily, AARP The Magazine, AARP Bulletin, Kaiser Health News and PBSs Next Avenue .