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However, the lasting effects of these injections can vary significantly between individuals, influenced by factors such as overall health, the severity of the deficiency, and the bodys absorption capacity

In people whose vitamin B 12 deficiency is related to overgrowth of intestinal bacteria, treatment with oral antibiotics such as tetracycline (sold under several brand names) may stop bacterial overgrowth and allow the absorption of vitamin B 12 to return to normal

If you suspect drug use as well, then look into a full-panel urine drug test

I take a multivitamin every day to stay healthy, but do I have empirical evidence it works