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However, they’re formulated to boost anabolic effects—muscle growth and repair—more than androgenic effects, which drive male traits like a deeper voice, facial and body hair, and libido.3 Yet another study, administering 1.000 mg testosterone undecanoate every 10–14 weeks (titrated to testosterone levels) for 2 years, reported a clitoral length of 2.0, 3.2, 3.3, 3.6, and 3.8 cm at baseline, 3, 6, 12 and 24 months of treatment (228). Anabolic–androgenic steroids (AAS) are a class of hormones that are widely abused for their muscle-building and strength-increasing properties in high, nontherapeutic, dosages. Even though they can still be prescribed by a medical doctor in the U.S., the use of anabolic steroids for injury recovery purposes has been a taboo subject, even amongst the majority of sports medicine doctors and endocrinologists. While many anabolic steroids have diminished androgenic potency in comparison to anabolic potency, there is no anabolic steroid that is exclusively anabolic, and hence all anabolic steroids retain some degree of androgenicity.LH stimulates the Leydig cells of the testis to produce testosterone and in conjunction with FSH, regulates spermatogenesis. Consequently, exogenously administered AAS will also exert negative feedback, thereby suppressing testicular testosterone production and spermatogenesis. Estradiol in particular is extraordinarily potent at suppressing gonadotropin secretion as, on a molar basis, it is estimated to be 200-fold more potent than testosterone in doing so (175). LH stimulates testosterone production and, in conjunction with FSH, regulates spermatogenesis. Activating this G protein-coupled receptor triggers a cascade of events that stimulates the synthesis and release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Gonadotropin-releasing hormone (GnRH) neurons of the hypothalamus secrete GnRH in pulsatile fashion into capillaries of the hypophyseal portal system. The testicular production of testosterone is governed by the hypothalamic–pituitary–gonadal axis (HPGA; see Figure 5).
Always consult a healthcare provider before starting any treatment involving testosterone. Anabolic steroids, however, are used for performance and physical enhancement, often at doses that are far higher than the body needs. One major difference between TRT and steroid use lies in the amount of testosterone being introduced into the body.
More recent well-designed trials continued to provide further support for the potent muscle-building effects of AAS that had already been recognized by athletes for decades (15, 22, 35–38). DHT also appears to be broken down in skeletal muscle by inactivation to 3α-androstanediol by the enzyme 3α-hydroxysteroid-dehydrogenase (20, 21). DHT levels are (very) low in skeletal muscle as it does not significantly express the enzyme. With physiological SHBG levels in the 10–56 nmol/L range, it is clear that supraphysiological dosages of testosterone saturate its binding capacity. The oral bioavailability of AAS can be increased by making the parent molecule more lipid-soluble by the esterification process described in the previous paragraph. It remains debatable whether or not physicians should medically target unwanted effects of AAS use. This review therefore provides a comprehensive overview of this class of hormones’ basic pharmacology and side effects.
The NCAA has also banned testosterone and anabolic steroids. The phrase "taking steroids" as used in mainstream society often refers to misusing synthetic testosterone to promote growth and muscle mass in athletes and bodybuilders. TRT is bioidentical hormones made with the same compound testicles produce, and is designed to treat clinically low testosterone levels by replenishing exactly what the body has lost or stopped producing.