b12 injection good for Do You Need a Prescription Injections? ✨ Benefits of B12 Injections:

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Most of the studies done so far have been in rodents -- results that dont always hold up when larger studies are done in people

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The reality check: the FDA does not consider it a legal cosmetic or dietary ingredient, and there is real concern that long-term use raises the risk of melanoma (skin cancer) the opposite of what most people assume a tan in a vial would do for skin safety (WebMD)