can you do your own b12 injections How to self-inject intramuscular vitamin - Overview Create a Vitamin B12 Self-Injection
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Many companies claim third-party tested, but testing only matters when the laboratories are credible and the results are actually reviewed

This metabolic function has led to widespread interest in whether B12 supplementation might support weight loss efforts

Liu W, Gou H, Wang X, Li X, Hu X, Su H, Li S, Yu J (2021) TTPAL promotes gastric tumorigenesis by directly targeting NNMT to activate PI3K/AKT signaling

And always avoid any unauthorized megadose vitamin regimens unless your provider approves