malfeasance
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Maybe - I do not know the answer. Production of IGF-1 is dependent upon a number of things. Steroids increase it. Insulin increases it. Estrogen increases it (that's right, the use of aromatase inhibitors, aromasin, arimedex, decreases it!). Obviously injecting growth hormone increases it. Injecting growth hormone decreases your body's natural hormone production. I am unclear on how long and that sort of thing - my knowledge ends at the bro science of Hey! Don't inject at night!You are correct about testosterone since your body will shut down production of natural test when using supplemental. So you are thinking using GH shuts down your bodies natural production of IGF-1 in a similar fashion?
I would think at some point injecting hgh would drive your IGF-1 number without respect to whatever it was before you began injecting growth hormone.
I am very open to be educated on this subject, however.