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Not all B12 that you eat or take in supplements is absorbed and research indicates that to achieve a sufficient daily dose of B12, you should take at least five to 50 micrograms daily or 1,000 to 2,000 micrograms weekly (Del Bo et al., 2019
doi:10.1186/s12859-020-03881-z
It has been recommended that serum total homocysteine (Hcy) and methylmalonic acid (MMA) levels are more sensitive indicators of vitamin B12 status in pernicious anemia patients without any other disorders of vitamin B12 metabolism
Ask a close friend, companion, spouse, or relative to learn how to administer vitamin B12 shots, or at least hold a mirror for you while you give yourself the injection, and rub out the pain afterwards to prevent bruising and other painful side effects
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