Igf requires AA water. I use 1 cc of aa water, then when I pin daily I draw back 3 small ticks on the insulin pin of igf and then 2 more ticks of bac water which gives me 1iu or 100mcg I believe the numbers come out to be.
FYI, studies show using just bac water it kills the igf after 3 days of sitting in the vial, AA water doesn't.
Reason for diluting with bac water is to lessen the sting