The over-the-counter vitamin B12 is generally just as effective as the prescription version. However, there are different causes for hair loss, so B12 may not necessarily solve the issue for everyone. The prescription B12 can be taken orally like the over-the-counter version, or it can be administered by injection for those who have trouble absorbing it. It is best to consult a healthcare professional to determine the best course of action for your specific situation.
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