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Hou, X., Rooklin, D., Fang, H
The goal here is clarity: explain what it is, how injections fit, and where effectiveness tends to show
Because of the 0.9% benzyl alcohol, bacterial growth is inhibited , so the opened vial remains sterile for multiple transfers (usually up to ~28 days if kept sealed and refrigerated)
By dosage, the mean changes were: 500 mcg: 127% 750 mcg: 176% (single study) 1,000 mcg: 280% 1,500 mcg: 310% 2000 mcg: 260% 5,000 mcg: 62% While 1,500 mcg of vitamin B12 showed the highest average increase, the effect plateaued or declined at higher doses, suggesting a possible saturation of absorption pathways
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