This depends on their health, how well they absorb the vitamin, and their lifestyle
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Conclusion Vitamin B12 shots are used to overcome vitamin B12 deficiency, which is common especially among the elderly, those with intestinal damage or disorders, people with pernicious anemia, and vegetarians/vegans
Its core physiological function is to catalyze the methylation of nicotinamide (NAM, a key precursor for NAD+ synthesis) with Sadenosylmethionine (SAM) to produce 1methylnicotinamide (1MNA)
This product does not require to be reconstituted with bacteriostatic water
Altered liver histology in mice does not prove treatment of human liver disease