Testosterone is transported in blood bound to a carrier protein, called either testosterone binding globulin (TeBG) or, more commonly, sex hormone binding globulin (SHBG). In healthy men, only about 2% of the circulating testosterone is unbound, with 44% bound to SHBG and 54% bound to serum albumin. The protein-bound testosterone is protected from metabolism in the liver and provides an easily accessible pool of hormone, as the testosterone readily dissociates from its binding protein. Levels of SHBG in plasma are regulated by androgens, oestrogens and thyroid hormones. In healthy men, SHBG levels are fairly constant, but may need to be considered when steroid replacement therapy is used. Plasma testosterone concentrations are around 9–41 nmol/L in healthy men and 1–3 nmol/L in women. Plasma testosterone tends to decrease with age in men. Testosterone is metabolized in the liver, mostly to form androsterone and aetiocholanolone, which are excreted in urine.
Anabolic steroids are synthetic versions of hormones that human body produces naturally. Their main role is to assure increased physical performance in all sports and athletic pursuits. Steroidal compounds enhance stamina, strength, weight and size of muscles and may improve the energy levels during physical training. Oral and injectable steroids posses the ability to increase athletic performance, have a positive effect on red blood cells production and bones density. The steroids are used in accordance with requirement and needs of any athlete individually. There are special compounds which are not suitable for women and a series of anti-estrogen products which main role is to counter the eventual side effects of steroids use and to restore natural testosterone levels of the human body. These compounds nowadays became an important part of muscle building process among professional athletes and bodybuilders, as well as regular people, males and females that have the goal to become more attractive and exhibit good looks. Follow us on Twitter | Steroids Store - Pinterest .