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Upper Buttocks: A Common Choice for Healthcare Professionals The upper buttocks, or gluteus muscle, are a popular site for healthcare professionals to administer Vitamin B12 injections

(I use a company that has an FDA inspected and cleared lab, and sources all of the ingredients only from the US.), and that ideally use should be supervised by someone familiar with peptides

Frequency: Once per day (subcutaneous), preferably in the evening

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Choosing between them depends on your personal needs, lifestyle, and wellness goals

doi:10.1007/s00109-016-1488-y Brcic L, Brcic I, Staresinic M, Novinscak T, Sikiric P, Seiwerth S