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B12 is also the second most essential nutrient for blood production
JoAnn Manson, chief of the division of preventive medicine at Brigham and Womens Hospital in Boston and professor of medicine at Harvard Medical School
Vitamin B12 deficiency in over 16s: diagnosis and management (NG239) Full guideline PDF
Seek medical advice if this happens
Many seniors need 500-1000 mcg of Vitamin B12 to keep their levels up
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