where to buy b12 injections reddit Shots and Online Do You Need a Prescription
Description
B12 shots are given in the deltoid or gluteal muscle

doi: 10.1182/blood-2017-03-770776 11 WangH-FNingFLiuZ-CWuLLiZ-QQiY-Fet al

The multi-faceted ecto-enzyme CD38: roles in immunomodulation, cancer, aging, and metabolic diseases

Sub q should in theory give close to 100% bioavailability, but we really dont know the one PK study never tested it, so theres no measured number and no dosing conversion behind it
