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The cyanide (prussic acid) in cyanocobalamin in supplements is generally not dangerous for the consumer
Environmental factors like UV exposure or pollution accelerate this by inducing more DNA damage, thus more PARP activity
People who find it difficult to get enough vitamin B12 in their diets, such as those following a vegan diet, may need vitamin B12 tablets for life
It is inadvisable to give yourself an injection of any sort unless you are fully confident in your ability to inject the drug or supplement safely, and this applies to a B12 injection too
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