It would seen like it would since hgh is the precurser to igf-1. HGH is released then the liver converts it to igf-1. So if your body has igf-1, I can see how it could suppress your hgh.
I believe that it can through some sort of a feedback loop. As far as I know getting tested while on IGF is not a good idea. I believe that they look at IGF levels to get an idea of how much GH you are producing.
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