http://anabolicminds.com/forum/post-cycle-therapy/66113-no-excuses-no.html
Excerpt from TheSinner's PCT thread. -
The first thing we need to understand is what is going on with our bodies when we're taking anabolic steroids:
Exogeneous anabolic hormones (or derivatives of anabolic hormones) are being brought into your system. This causes the body to take a number of responsive actions. The first and foremost (as you already know) is increased muscle mass. Unfortunately, other things are also going on that aren't so great
When an enzyme or hormone is brought exogeneously into the system, chemical balances shift around to attain a certain equilibrium. This is a chemical concept known as Le Chatelier's Principle of Chemical Equilibria. In a nutshell, your body will increase production of estrogen, cortisol, and other hormones in response to heightened testosterone levels, while simultaneously slowering (or completely stopping) natural production of testosterone. Biologist call this negative feedback.......biology sucks doesn't it?
Le Chatelier's Principle for the scientifically impaired:
Let's pretend A and B react to make C (can't get much simpler than that).
A + B --------> C
So we have a mixture containing A, B, and C. According to LeChatlier's principle, if we add more C to the mixture, the amounts of A and B will increase. If we remove some of the C from the mixture, A and B will decrease. And if we were to add A, B, or a combination of the two, C will increase. Still with me here? Good.
What's going on when we come off a cycle:
Ok, so while we're on the cycle, are natural test production is going down to compensate for the exogeneous test intake, and our production of other steroid hormones (i.e. Estrogen, Cortisol, etc.) is going up to compensate for the heightened test levels. When we come off a cycle, we cease intake of exogeneous testosterone. In other words, we have very low test levels, and very high cortisol and estrogen levels: it's the EXACT OPPOSITE of what we had while starting our cycle.
REMEMBER Le Chatelier's Principle because this is where it gets really important. When we have an excess of one hormone, the others will start shifting around, to attain a certain equilibrium. Ok, I'm gonna say it (and bold it) again because it's just that important. When we have an excess of one hormone, the others will start shifting around, to attain a certain equilibrium.
It is a very common misconception that we want to eradicate estrogen . High estrogen levels play an integral part in Post Cycle therapy. That's right, you want to welcome high estrogen with open freaking arms, but there's a trick to it. And that trick is the almighty SERM (Selective Estrogen Receptor Modulator).
SERM's: the foundation of post cycle therapy:
Selective Estrogen Receptor Modulators are (and damn well should be) the foundation for any proper post-cycle therapy plan. A post cycle therapy plan without them, isn't a post cycle therapy plan: it's a bunch of crap you decided to take after doing a cycle. The purpose of a SERM is to block the negative effects estrogen, while your hormone levels go back to equilibrium.