I like to mix my test ahead of time in a sterile vial, then pull into a syringe to inject. With that in mind, the mg/ml matters and the pip doesn't. If the test is (assuming accurately dosed) at 300, 400, or 500mg/ml, that means fewer ml for each inject.
When also adding mast e, Tren e, and possibly a dash of deca (for joints), it can wind up quite a few ml per week. I want to keep the volume of injects to an absolute maximum of 3ml eod.
Let's have a more specific example:
Test 450+ Mast 200 at a 1:1 mix yields
Test 225+Mast 100 (per ml), and no pip worth mentioning.
My problem is that the test 450 I have is a blend of 5 esters and I am less comfortable than when using a single ester containing Test c, even if I inject eod.
Lots of posters have mentioned some sources of concentrated test that they like, but not the ester or whether it is a single ester. I'm hoping to find single ester sources, preferably ones that have a verified concentration as advertised. Otherwise I may have to consider going back to the old test c 250mg/ml, and wrestle with a mix that gives me enough mg per week without being an uncomfortable inject volume.