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Analytical methods 4.5.1

Though the GLP-1 shortage that initially allowed compounding has ended, "a regulatory loophole" allows compounders to continue to sell copycat versions if they customize the formulations, such as by adding vitamins, Bloomberg reports

G. Sosne and E. A. Berger, Thymosin beta 4: A potential novel adjunct treatment for bacterial keratitis, Elsevier BV, May 2023. doi: 10.1016/j.intimp.2023.109953

The question is are these claims valid and if so what are some reasons b12 shots would not actually live up to their potential

I know and I've validation tested and done independent validation testing of a lot of these companies