While most patients tolerate B12 shots well, mild side effects can occasionally occur, including minor pain or redness at the injection site, mild diarrhoea, or, in rare instances, an allergic reaction
Stuart (USA authors) Very comprehensive book about B12 deficiency with lots of case studies
S2CID 9346522
Stacking peptides increases both potential efficacy and complexity
Research progress Support The animal experiments have achieved remarkable results: In the obese mouse model, after daily subcutaneous injection of AOD 9604 (250 g/kg) for 8 weeks, the body weight of the mice decreased by 12%, the subcutaneous fat mass decreased by 25%, and the weight of epididymal adipose tissue significantly decreased, confirming its effectiveness in fat reduction
This contains B12 but also has the other B vitamins other than B12