Injectable use is often marketed as more direct, but neither route has enough high-quality clinical evidence to support routine use for tendonitis
FDA did not evaluate Crohns disease, celiac disease, or tendonitis under the vote question because the nomination lacked sufficient information and the agency did not identify suitable clinical studies in those populations
Injections skip this process by going straight into the bloodstream
Unlike oral supplements, which face the gauntlet of our digestive system (and often get broken down, resulting in as little as 20-50% absorption), intravenous delivery bypasses the gut entirely
A B12 injection is a clinical procedure: site rotation, clean technique and correct dosing matter, which is why a trained clinician is the safest place to have one
Conclusion Vitamin B12 is more than just a nutrient