Tamoxifen and IGF-1 produciton
I was searching about Tamoxifen's effect on IGF-1 production, which alot of people say is why it reduces gains on cycle, with google and came upon this:
"On a tangent, The IGF-1 to which we're referring is only hepatically-derived IGF-1 and not the splice variant of IGF-1 that is expressed in skeletal muscle. It's still debatable whether or not systemic, hepatically-derived IGF-1 plays any significant role in skeletal muscle hypertrophy. When injected IM, it induces hypertrophy in the muscle into which it was injected....also, when IGF-1 (the hepatic isoform) has been expressed in skeletal muscle (rats), there is significant hypertrophy in the muscle in which it was overexpressed and some effect on nearby muscles, but there has shown to be NO increase in plasma IGF-1 levels. This implies that IGF-1 does not leave the muscle,which is its site of origi, very effectively. This would also suggest the opposite is true; that it won't enter muscle efficiently."
So, if Tamoxifen reduces IGF-1 does it only do so in the liver?; and IGF-1 sourced from the liver is not-anabolic (ie doesn't make it to muscle tissue)?