an IU (International Unit) is not a standard measurement in CC/ML.
What I mean is you could have 500iu in one ML, or you could have 10,000iu in one ML.
Your Human Chorionic Gonadotropin (HCG) will come in a powder of say 5,000iu. Depending on how much water you mix it with will determine the conversion to a ML. ie; if you mix that 5,000iu with 10 ML water, you have a concentration of 500iu/ML.........if you mix it with 5 ML water, it will be at a 1,000iu/ML concentration.......got it ?