what works better semaglutide or tirzepatide vs. Semaglutide: What's the Difference? Semaglutide vs Tirzepatide: Which Is
Description
Once-daily GLP-1 receptor agonist therapies are also available in fixed-ratio combination formulations with long-acting insulins (insulin glargine with lixisenatide [22] and insulin degludec with liraglutide [23])

No, vitamin B12 does not directly make tirzepatide more effective

Discussion In this nationwide register study, we investigated the association between new users of GLP-1 RAs, SGLT-2 inhibitor users and DPP-4 inhibitor users and the risk of suicide or suicide attempts

There is no simple yes or no answer
"I come across a number of patients in this similar situation," Natesh says

J Biol Chem 295:1049310505