Keifei Growth Hormone 36iu PenDosage: 0. 1 iu 1 iu Day Chemical Name: Human Growth Hormone Quantity: 1 x Pen Picture may differ from actual Product. Keifeitropin Pen Presentation: Each pre filled disposal pen for subcutaneous injection contains 36IU(12mg) of Somatropin with Pre mixed powder and solvent solution. You never have to change cartridges. When the pen is empty, you just start a new pen. Non re fillable pen. Pen is packed in a printed Keifei logo PVC bag in a print box