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While oral B12 supplements are available, vitamin B12 injections have advantages including enhanced absorption since it bypasses digestion, a fast-acting energy boost from quick absorption, higher blood levels reached versus pills, lasting benefits between maintenance doses, improved concentration and mental clarity, and often more affordable and convenient long-term
Who needs vitamin B12
Too much NNMT can lower levels of NAD+, leading to weaker muscles and poorer muscle function as you age
They can show you how to inject the drug and help determine which injection sites are best for you
doi:10.1136/bmj.285.6337.264
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