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Dietary supplements containing only vitamin B12 contain higher doses, such as 500 mcg to 1,000 mcg of vitamin B12
they don't replace it
However, while B12 injections or oral supplements are typically considered safe, there are significant risks when administered without proper preliminary testing
Both compounds cause primarily gastrointestinal side effects that are most pronounced during dose escalation and tend to improve with continued use
On the other hand, starting off in an already sleep deprived state is asking for trouble
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