I use Hygetropin which comes in 8iu bottle. Use 0.8 cc's of bac water, so that 0.1 cc is equal to 1 iu. Be very careful when mixing it as GH is unstable. Do not spray the water directly on the powder. Let it run down the side of the vial and then GENTLY swirl it until it is mixed. It is good for 10 days in the fridge when reconstituted so I usually mix up a few bottles at a time.