is the b12 injection good Methylcobalamin (Vitamin B12) is one b12 injection enough

The formulations were also investigated for their potential for hair growth and hair follicle viability in cases of secondary alopecia

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For deficiency, B12 shots are given weekly or every other week at first

While the vast majority of people absorb enough B12 through their regular, balanced diet, there are some patients for whom this is much more difficult