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Vitamin B12, like any medication, can have potential risks and side effects, particularly if administered incorrectly or in excessive doses
Many people also experience an improvement in their hair texture and find that their hair is much thicker and more lustrous after just a few B12 treatments
Unfortunately, some patients have difficulty absorbing an adequate amount of vitamin 12 because they do not produce enough stomach acid due to a condition called autoimmune atrophic gastritis which can cause a deficiency of vitamin B12
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