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If you start feeling symptoms of deficiency again, your health changes, or your B12 levels drop, you might need to adjust your schedule
Vitamin B12 plays a vital role in helping your body produce red blood cells
Long-term untreated vegan diet where deficiency has progressed beyond what oral replacement can comfortably catch up
In fact, according to the National Institutes of Health, nearly 1 in 5 adults over 60 and up to 15% of the general population are estimated to be deficient in vitamin B12
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