All weight loss injections work in a similar way, depending on which active ingredient is used (liraglutide, semaglutide, or tirzepatide)
A decrease in vitamin B12 and/or folate results in an increase in homocysteine level
If the injection interacts with your medications
I have previously generated sections on how to reconstitute retatrutide, the correct bac water ratio for retatrutide, and the proper mixing process
There are, however, two studies that we can call on: Pentadecapeptide BPC 157 Interactions with Adrenergic and Dopaminergic Systems in Mucosal Protection in Stress (link) This study wasnt designed to find the comparison between two administration methods, but it did look at how different systems of the body would affect these two methods
Energy metabolism: B12 helps break down carbohydrates into glucose and metabolize fats, which provide energy at the cellular level