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The trade-off: Injections deliver the molecule most efficiently, but they dramatically raise the "risk floor" due to issues like sterility and systemic allergic responses
28 DuanJ.GuanY.MuF.GuoC.ZhangE.YinY.et al (2017)
The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Mental Health or the National Institutes of Health
Too much absorption could force you to take even more B12 so you can balance out the levels to where they should be
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