Likely, multiple mechanisms contribute
If you work a typical Monday-to-Friday schedule, consider scheduling your injection on a Thursday or Friday evening
Patients inadequately controlled with diet and exercise alone If therapy with a combination tablet containing sitagliptin and metformin is considered appropriate for a patient with type 2 diabetes mellitus inadequately controlled with diet and exercise alone, the recommended starting dose is 50 mg sitagliptin/500 mg metformin hydrochloride twice daily
GLP1s in higher amounts also act on portions of the brain that suppress appetite and signal satiety (feeling full)
Some groups (online forums) buy from online vendors and then pay to have random samples sent in for purity analysis, then publicly publish said results as a way to help keep the vendors honest
If you are also taking other medications, such as Ozempic, be sure to discuss timing and interactions with your provider