is b12 injected into the muscle How to self-inject intramuscular vitamin - Overview Best Vitamin B12 Injection Sites

You are unique, so what works for someone else may not benefit you the same

The exception involves individuals with specific genetic variants in the MTHFR, MTR, or MTRR genes that impair B12 metabolism

10 Other people who are at risk for vitamin B12 deficiency include individuals: 11 who have had bariatric surgery, with malabsorption syndromes such as celiac disease and tropical sprue, with pancreatic insufficiency, who are alcoholics, with AIDS, who have used acid-reducing drugs long-term, and who are vegetarian

Food and Drug Administration (FDA) allowed compounding semaglutide during the shortage of Ozempic and Wegovy