Giant Semaglutide Thread (and other GLP-1 / GIP agonists)

Would you guys reccoment 15 or 20mg vials for tirz? First time with GLPs so I'm gonna do the pharma protocol (2.5 for 4 weeks, then 5 for 4 weeks and so on).
The first vial would last me 5 or 6 weeks, is that too long? will it loose potency?
 
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