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Biker is correct its all down to the HGH you use. Some is only 4iu a ml some is 10 iu a ml.
If you use Jintropin for instance like me with the yellow tops then that is 10iu per ml. So when you mix your 1ml of water with the powder you get 1ml of solution containing 10iu of HGH. If this is the case then yes 20 on the slin pin is 2iu.
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