Omnitrope 10mg 30 IU comes in a reconstituted (pre-mixed) cartridge. Omnitrope is made by Sandoz and is a FDA approved Human Growth Hormone. Like all other FDA approved human growth hormone (HGH), Norditropin is a 191 amino acid chain. Omnitrope comes in a pre-mixed cartridge that loads into the SurePal pen. Unfortunately, we no longer have access to the SurePal pens. There is no mixing HGH with bacteriostatic water. However, if you don't have the SurePal pen, you will have to extract the Omnitrope HGH with a diabetic needle. While this is feasible, the Norditropin NordiLet Pen comes in a disposable pen with needle caps and is also FDA approved. If you don't have the SurePal pen, I would not recommend Omnitrope but instead recommend Norditropin.