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Description
Injectable B12 delivers the vitamin directly into the bloodstream, allowing for immediate absorption

Segner H, Lenz D, Hanke W and Schrmann G 1994 Cytotoxicity of metals toward rainbow trout R1 cell line

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10.1080/14712598.2021.1823368 CrossRef Google Scholar View reference in article 69 LalatsaA.SchatzleinA

The body stores Vitamin B12 readily, so maintenance may not be necessary or requested by patients for several months at a time
