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self administered vitamin b12 injections Best Injection Sites: Where to Inject B12 · PA Relief Vitamin b12 Injection | CardioMender,
Description
Protocols, doses, and reactions reported below come from published clinical trials and self-reported community sources

[DOI] [PubMed] [Google Scholar] 186.Kopelman P, Groot Gde H, Rissanen A, et al

Antineoplastics that are antimetabolites for the vitamin may induce inadequate utilization of vitamin B12
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Hormone disruption: It doesn't affect testosterone, estrogen, thyroid, or other hormones