Nobody should try to inject the vitamin B12 solution on their own, and its best to have it done by an expert or professional
[5] Use of Lipo-C Injection is contraindicated in patients with known hypersensitivity to methionine, choline salts, carnitine, dexpanthenol, or any formulation excipients, as well as in individuals with severe hepatic failure in whom augmented methionine intake could precipitate hypermethioninemia and encephalopathy
CPT 96372 covers injection into muscle tissue or subcutaneous tissue
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Another study published in Diabetes Care showed that combining semaglutide with vitamin B12 supplementation led to improvements in insulin sensitivity and glucose metabolism, making it an effective option for individuals with prediabetes or type 2 diabetes
Therefore, there is a very low risk of B12 toxicity, even at high doses like 1,000 mcg a day