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Wang, D., Guo, K., Zhu, Y., Sun, J., Dreglea, A., & Yu, J
Ventrogluteal Muscle: This site, located on the hip, minimizes the risk of hitting major blood vessels or nerves, making it a preferred site for healthcare professionals
The FDA placed it in 503A Category 2 ("may present significant safety risks") in 2023, effectively barring compounding pharmacies from using it, then removed it from that category in April 2026 after nominators withdrew their submission, without adding it to the approved Category 1 compounding list
Frequency of Monitoring The outcome measurement of vitamin B12 level was done from a range of 13 months (exception of Delpres study, which was done ranging from 9 to 14 days)