The Complete Guide to B12 Shots Rebekah Jun 4, 2025 12 min read Updated: Nov 3, 2025 B12 shots are injectable forms of vitamin B12 (cobalamin) administered directly into muscle tissue, typically in the arm or thigh
Based on the data available in 2015, EFSA did not identify any known health risks associated with the use of dietary supplements, so no maximum dose or maximum daily intake, also known as a tolerable upper intake, was set (EFSA, 2015)
Studies have found 12 to 58% of ergogenic supplements contaminated, 30% containing incorrect amino acid sequences, and 65% exceeding safe endotoxin thresholds
Medication/Drugs Mixing alcohol and medications/drugs together can lead to serious physical, behavioral, and health complications