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It is not about doing something wrong, it is about knowing what your body might need
Unlike many medication side effects that remain controversial, the association between metformin and vitamin B12 deficiency is supported by decades of clinical research
Also read: Choosing the Right Vitamin B12 Supplement: What You Need to Know

At 0.25mg weekly, you draw 5 units per dose and use 1mg over four weeks, with 4mg remaining