GLP-1 Forum

Thoughts on injection pens & peptide filtering?

mercuryleaf7

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Sep 24, 2025
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Hi everyone, I am currently waiting on my first grey order of Tirzepatide and whilst doing my research I have learnt about syringe filters and how they can remove bacteria and other nasties.

Obviously once you reconstitute and then go to pass the mixture through the filter you need a sterile vial.
I am struggling to find sterile vials or more so how to be sure they're sterile as I can't find any medical suppliers selling them in the UK.

I was thinking would it be better to just buy some pen cartridges and put the filtered solution into that to make it easier to inject each week.
I may have to sterilise the cartridges in a pressure cooker or something but I just thought if I'm going to all this effort anyway maybe I should have the convenience of a pen at the end of it.

Leading on from that what's everyone's favourite pen styles/brands? The ones I've seen so far are below.
  • Injector pen v2/v3
  • Bird pen
  • Uni pen
  • Novo Nordisk NovoPen4 (with adapter to make universal cartridges fit)
 
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