Saizen 24 IU is a human growth hormone (hGH) preparation that is used to treat growth hormone deficiency in both children and adults. It is a long-acting form of hGH and has a half-life of 2.5-3 hours. The recommended dosage for men is 4-10 IU per day. Saizen 24 IU is not associated with water retention, acne, or hepatotoxicity. It also does not aromatize.