where do you give vitamin b12 injections Shots at Home: How, & How Often to Inject Yourself Where to Inject Vitamin B12
Description
Apply Pressure : Post-Injection Care : Use a cotton ball or gauze to apply gentle pressure to the injection site for a few seconds

Advanced Protocol (Weeks 3-12) For individuals with higher body weight, metabolic resistance, or those seeking maximum metabolic enhancement, an advanced 5-amino-1MQ dosage protocol of 100mg daily may be appropriate
Trends in Endocrinology and Metabolism (2017) 7

Why Researchers Choose Cenexa Labs End-to-End Chain of Custody : Every batch is logged, tested, and traceable no middlemen, no relabeling, no guesswork

The numbers below come from two places: rodent studies scaled to a human size (allometric scaling) and several years of research community use reports