This mechanistic distinction is one reason these compounds are sometimes studied together in multi-compound laboratory research designs (each acts on a different pathway, so each provides an independent variable for the research design)
Additionally, theres currently no evidence that one form of vitamin B12 supplement, such as capsule or liquid, is better absorbed than another
By itself, B12 will generally NOT help with weight loss
You want a product from a reputable source that guarantees sterility and the correct concentration of benzyl alcohol
"Research chemical" peptides from unregulated sources carry additional risks unknown purity, incorrect concentrations, contamination
Double-check your math before every injection, especially during the first few weeks when you are establishing your routine