Hey QT --- I beat my brains on this one --- all I know about IGF-1 is that it is a precursor to GH in your body.. For example, if you want to get your GH tested (amount), they measure the IGF-1 because it is less transient than the actual GH.
As a "supp", I've never heard of women using it. Some guys have gotten nothing out of it, some have gotten amazing results. Generally I've heard for the money, use something different.