@Ctrain24 where did you get the adapter. Can only seem to find it at one place online and they are out of stock.

Is the Novopen 4 compatible to use for peptides. Obviously knowing that I'd have to buy 3ml cartridges?

@randy...so I'm assuming you can't use the same pen for different peps that you are taking at the same time? Like could you take cartridges in and out interchangeably in one pen or do you need a different pen for each pep?

Just wondering where I can get the cartridges that fit in the pens. Any recomendations?