And this is the area where you are missing it.
An IU = potency, not MG. MG is weight only.
Let's say we purchased 10IU GH -- this means the rHGH measures a total of 10IU potency,
but that's all the 10IU means. Next we check out the MG and it's here that GH manufactures vary as there are several methods to manufacture GH. However in a nut shell, they'll formulate the protein - taking it though a lyophilized process, leaving a powder remaining. This is what we call "the puck". But this might be the part you're missunderstanding -- this powder is NOT all pure GH.
Aggragates/fillers have been added (these vary too) giving us the final weight of the GH = MG.
To be clear, the more IU per MG, generally the more simplified the protein (GH), w/fewer fillers.
By the way, if you are questioning that manufacturers vary their IU per MG, here's a post which includes a picture I took back in Oct. 09, of 3 different pharmaceutical brands of GH.
http://www.professionalmuscle.com/f...son-problems-w-synthetic-gh-2.html#post664957
Note the Genheal on the right shows
4MG 10IU as I previously stated. Next, if you look closely at the middle box (GenSci's) at the top right of the box you'll see it says "
10IU(3.7 mg)". Though 3.7mg doesn't go into 10IU (so figure that one out), but this is what they clearly list and they are FDA approved. The Humatrope on the left shows
5MG and they're
15IU vials. I'm sure you can do the math, noting the variances between IU's and MG's.
For more information on IU vs. MG, check out this link - it's really very simple, but misunderstood as you've reflected.
**broken link removed**
Note it states,
"
How can I convert from international units (IU) to milligrams or micrograms?
Generally speaking, you can't. IU's measure the potency of a drug, not its mass or weight."