I really appreciate this insight, and I’m going to carry it around with me. It feels much more true to me than the idea that introversion versus extroversion is just about social life. As Susan Cain states, “It’s the idea that we all have a battery that either gets drained or recharged depending on how much social life is coming at you. I think this is largely accurate and helpful as a metaphor but it’s important to understand that it is only a metaphor for what is happening neurobiologically. The fact is that introverts and extroverts really do have different nervous systems. We are wired differently. Introverts have a nervous system that reacts more to all forms of stimulation — whether that’s lights, noise, or social life.”
The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
The Mesterolone hormone is not estrogenic. It does not aromatize and it carries no progestin nature. As a result, the side effects of Proviron will not include any related effects such as gynecomastia or excess water retention. Such adverse effects are impossible with this steroid. This will also greatly reduce the risk of high blood pressure as high blood pressure associated with anabolic steroid use is often due to extreme water retention. In fact, Proviron should provide an anti-estrogenic effect by preventing testosterone to estrogen conversion or at least tremendously slow it down.