I'm sure you already know this or I hope so but a little tip and something I always tell people is to be careful not to let the water hit the dry powder (peptide) with the water when mixing. I always point the needle at an angle and let it dribble down the side of the vial. Most peptide vials are vacuum sealed if they're good quality. So I make sure I have the needle at an angle before I even pierce the rubber stopper or the vacuum will suck the water right out of the syringe as soon as you pierce the top. Peptides are very fragile especially the higher amino chain like hgh so letting the water hit the peptide directly under pressure will destroy it.