Refillable injector pen

What a pain in the ass I think I'll stick with single use insulin pins.

Yup pain in the ass..
5 minutes to load a 3ml glass cassette that lasts me 30 days

But spending the 5 minutes to reconstitute & fill a syringe and pin every single day is fine

Venting is no issue at all.
1 syringe fills and a needle tip in just to allow air escape, thats all thats needed.

The glass cassette holds i believe 3.3-3.5ml so could be enough volume to last you 30ish days and once thats done all you do is throw a needle on the end and your done.

Repeat the 5 minute process when completed all the 3-3.5ml of peptides
 
What I meant was a pain trying to figure out the components. I should have been more clear.

Is this the right pen?

Eli Lilly 2 Pen Type Insulin Syringe Is Suitable For 3mL
That will absolutely work. You can also search for “V1” and “V2” pens, and “HumaPen” for some nice discounted Lily Savio pens (should be <$30). Just avoid Novo pens, as they need to be modded, so probably aren’t the best starter pen.
 
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