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Description
If you have been diagnosed with a B12 deficiency, your healthcare provider may recommend regular injections of vitamin B12

For most adults 60+, a sublingual methylcobalamin at 1,000 mcg daily is the right default

10.1074/jbc.M609554200 [DOI] [PubMed] [Google Scholar] Tsujii Y., Nishida T., Osugi N., Fujii Y., Sugimoto A., Nakamatsu D., et al

You can also take B-12 tablets as a supplemental source

B12 is used to metabolize methylmalonic acid (MMA) and homocysteine, and it looks like theres additional benefit up to an intake of six micrograms
