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A Phase I study conducted by Diaz CM et al

pmid:34140279FREE Full TextGoogle Scholar Metformin and reduced vitamin B12 levels: new advice for monitoring patients at risk

This revitalizing treatment delivers a potent dose of B12 directly into your bloodstream, ensuring fast absorption

Contact your medical team if you experience fever, unusual bleeding or bruising, severe diarrhea, mouth sores that prevent eating or drinking, or skin reactions

Similarly, both the pill and the birth control shot have been linked to lower levels of vitamin B12, although, its not yet known whether this leads to any symptoms or need for treatment since the levels were still within the range thats accepted as normal [27]