When to use a pen and when a syringe?

[miameow]

The advice for blends that I read is that you recon with bac amount for the largest mg amount pep, then use that solution to recon each successive peptide. so you dont end up with a large volume. all based on what mg dose youd want of the first.
i.e. Klow 80. you'd recon for the 50 GHK-cu amount, disregarding the other ones. ( However in the case of Klow. I add way more bac, because it lessens the sting.)

It seems like you are recommending how to mix multiple peps in one vial, no? Yeah I don't do that.

The correct way to recon is to get the amount of liquid that you can comfortably handle.