AA to bring fix the PH levels/stabalise, so inject an appropriate ratio into the vial. then when you use the syringe to get the dose you want, take up BW aswell at a ratio of 4:1 (bw:AA/igf) within the syringe then inject. this is what ive picked up from the forums. has to do with avoiding necrosis and keeping the acidity down and increasing its shelf life