Insulin and HCG is measured in US Pharmacopeia Units or USP U's
Not if they are manufactured anywhere except in the US. In europe and mexico, the source of most non-prescription HCG used by bodybuilders, IU's are used. Actually, more technically, the UI is used. It is just the french abbreviation for unité international and is the same unit of activity as the IU. For instance, I have a box of Profasi in front of me as we speak with each amp containing 10,000 UI of HCG.
If you visit the US Organon site you will see Pregnyl dosed in USP units. If you visit a european Organon website you will see the same drug dosed in UI.
I see this type of question posted so often, usually relating to reconstituting GH, that this entry from a pharmaceutical dictionary might be helpful to readers.
international unit (IU)
a unit used to measure the activity (that is, the effect) of many vitamins and drugs. For each substance to which this unit applies, there is an international agreement specifying the biological effect expected with a dose of 1 IU. Other quantities of the substance are then expressed as multiples of this standard. Examples: 1 IU represents 45.5 micrograms of a standard preparation of insulin or 0.6 microgram of a standard preparation of penicillin. Consumers most often see IU's on the labels of vitamin packages: in standard preparations the equivalent of 1 IU is 0.3 microgram (0.0003 mg) for vitamin A, 50 micrograms (0.05 mg) for vitamin C, 25 nanograms (0.000 025 mg) for vitamin D, and 2/3 milligram for (natural) vitamin E. Please note: for many substances there is no definite conversion between international units and mass units (such as milligrams). This is because preparations of those substances vary in activity, so that the effect per milligram of one preparation is different from that of another