b12 injections used for Benefits of Optimal Health Vitamin B12 Injection, 1000mcg, 10ml,

Human clinical research remains early stage, with small pilot studies exploring its effects on exercise performance, insulin sensitivity, and metabolic biomarkers rather than obesity endpoints

Some preliminary research also suggests potential benefits for cartilage and joint health, though this application requires further clinical investigation

[10] [11] Intramuscular B12 injections (hydroxocobalamin or cyanocobalamin) bypass the digestive system, but UK product information (SmPCs) for hydroxocobalamin injections does list gastrointestinal disturbances, including diarrhoea, as possible adverse reactions, albeit rare

Vitamin B12 injections are supplemental treatments containing cyanocobalamin, a synthetic form of vitamin B12