The difference between the two is that cyanocobalamin is a synthetic form of Vitamin B12 found only in supplements (pills), while methylcobalamin is a naturally occurring form that you can get through either food sources or injections
[7] Improved body composition: From a fitness perspective, reducing subcutaneous fat can help reveal muscle definition and improve overall body composition, which are important factors for bodybuilders and fitness enthusiasts
Nutrient Requirements of Swine , 11th Edition
[4] Reminder: there is no magic pill and no magic peptide, however, used in combination with low hanging fruit like diet, exercise, and simple lifestyle modifications, a lot is possible
Tiaminal B12 Injection Protocols for Dual Deficiencies Tiaminal B12 injection helps those with both vitamin B12 and thiamine deficiencies
So the two papers above are doing real scientific work