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These are not FDA-registered manufacturers in the same sense as Pfizer or Fresenius Kabi they operate under pharmacy compounding regulations rather than drug manufacturing regulations
Absorption, plasma transport, and cellular retention of cobalamin analogues in the rabbit: evidence for the existence of multiple mechanisms that prevent the absorption and tissue dissemination of naturally occurring cobalamin analogues
Serum B12 The graphs show a general trend of quick, initial changes which then slow over time, and that the poorer your initial B12 status is, the more quickly it initially changes
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