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Journal of Clinical Medicine
Injections are easy and painless
[4] However, consistently taking large amounts of vitamins from multiple sources could potentially increase the risk of side effects (for example, very high vitamin B intake from multiple supplements over time can cause neuropathy, and high niacin from many sources could affect your liver)
The usual dose for vitamin B12 injections is 1000 mcg (1 mg), given by injection
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