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Neurologic symptoms may take longer, but many people notice energy/mood improvements within days to weeks once deficiency is corrected
Structure-Activity Relationship Studies Structure-activity relationship (SAR) studies examine how changes to a molecule's structure affect its function
Injections bypass these requirements, providing 100% bioavailability regardless of GI function
But like any performance-enhancing compound, it demands respect
Neuroblastoma: an evaluation of its natural history and the effects of therapy, with particular reference to treatment by massive doses of vitamin B12
The biggest difference is bioavailability , which is how much of the vitamin enters your bloodstream
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