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Taking in extra B12 through injections or supplements when your levels are already normal will not provide additional benefits

Infection risk: Though the benzyl alcohol preservative inhibits bacterial growth in the vial, any lapse in sterility (dirty needle, etc.) can introduce pathogens

To date, there are no large-scale, randomised controlled trials (RCTs) the gold standard of clinical evidence that have conclusively demonstrated its efficacy for hair regrowth in humans

Before every single draw, vigorously wipe the rubber stopper with a 70% isopropyl alcohol pad and let it air dry for a few seconds

Poor vitamin B 12 status has been linked to increased risk of breast cancer in some, but not all, observational studies