@mrjoshua44 100% this: we’ve seen so many people try mixing their peps including specifically a GLP-1 and report very bad outcomes either with gelling or very uncomfortable ISR’s. I have mostly seen people report gelling.
With other peps, mix if you want, but go slow if it is something you haven’t seen mixed or blended. My bride’s rat was complaining about multiple pins so her peptide concierge mixed her Glow and ARA-290 into one shot. She complained about the ISR pain for 4 days and her concierge requested a transfer to Anna Wintour. (The request, sadly, was denied.)