Started out using Norditropin Pen but decided to look for an alternative due to price. I went with GG's Rips and get all the same sides I did from the Norditropin. Was using 2iu per day on the Pen and I am using 5iu per day on the Rips. I think I could bring down the IU per day on the Rips but at 5iu a box lasts one month (5 days on 2 off)Could not be more pleased with delivery, customer service, and most importantly quality of the product. Keep killin it GG.