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Some doctors may also administer single-ingredient shots, such as vitamin B12, but these are Theres no official guidance on the frequency of lipotropic injections for weight loss

Int J Mol Sci 23:1851 Ding C, Wu Y, Chen X, Chen Y, Wu Z, Lin Z, Kang D, Fang W, Chen F (2022) Global, regional, and national burden and attributable risk factors of neurological disorders: the global burden of disease study 19902019

There are exceptions to this but in general it is left to Pharmaceutical companies to develop medicines that can be used to treat diseases like Pernicious Anaemia

(PubMed) da Costa KA, Niculescu MD, Craciunescu CN, Fischer LM, Zeisel SH