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What Nolvadex Truly Is
Most lifters assume Nolvadex is a pure estrogen antagonist (which would mean it prevents estrogens from acting on their receptors). As far as bodybuilding is concerned, this assumption is very wrong as Nolvadex is both an estrogen receptor agonist and an antagonist. It all depends upon the tissues. Along with the nipples, on which Nolvadex acts mainly as an antagonist, we are also interested by its behaviour on skeletal muscles, on the liver and on the fat cells.
Nolvadex has been shown to behave as estrogens in skeletal muscles (5). This is a very good thing for every athletes except bodybuilders. You see, estrogens protect muscle cells from the training-induced damages (5-6). It means that one can train more without damaging his muscles. Recovery will also be much faster. But for bodybuilders, the training-induced damages are a key ingredient to trigger growth. Nolvadex will therefore reduce the muscle building effects of resistance training.
As for the impact of Tamoxifen on IGF-1, it simply demonstrates another estrogen-like action of Nolvadex. By rendering the liver less sensitive to growth hormone (probably by reducing the liver density of GH receptors), estrogens and tamoxifen diminish the production of IGF-1. This action of estrogens explains why women produce less IGF-1 than men even though the have a higher GH level.
Thank you for this post! I've posted numerous times on superior choices to novla and has fallen on deaf ears.