100 iu would last you depends on how much a day you are taking. It would prolly have 10 10iu vials in it, which you dilute with bact water. You get 100iu total out of kit, so if you use 5iu a day it would last you 20 days, and you usually want to run GH for 6 months, so do the math, anyways it will cost you a pretty penny