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Due to the large absorption area (around 100 m2, which is equal to a quarter area of a basketball court), the main absorption site of drugs is the small intestine

The Vitamin B12 injection is a highly effective treatment for Vitamin B12 deficiency

In cases where hypersensitivity is confirmed, desensitization protocols have been developed to allow patients to continue receiving necessary vitamin B12 supplementation safely

It is important to note that all current evidence derives from in vitro cellular models and in vivo animal studies, and no human clinical trials have been conducted as of February 2026

Those drugs are based on the active ingredient tirzepatide, which mimics two hormones: GLP-1 and GIP