giving b12 injection in thigh Vitamin C and Techniques Best Vitamin B12 Injection Sites:

Medicare and most payers require clear documentation of the dose administered, the week preceding the first dose (if applicable), and related CPT codes for injection administration

On the other hand, it would seem that a lack of vitamin B12 can cause people to lose their appetite, resulting in a decrease in weight rather than an increase in weight

How Long Does a Vitamin B12 Shot Last

FDA's evaluation concluded that the criteria weighed against placement on the list, citing inadequate physicochemical characterization, immunogenicity concerns from impurities and aggregates, lack of clinical effectiveness data for any approved use, and absence of published human exposure data for the proposed subcutaneous and topical routes