In contrast to most other AAS, 17α-alkylated testosterone derivatives show resistance to metabolism due to steric hindrance and are orally active, though they may be esterified and administered via intramuscular injection as well. An exception is the very long-chain ester testosterone undecanoate, which is orally active, albeit with only very low oral bioavailability (approximately 3%). AAS that are not orally active are used almost exclusively in the form of esters administered by intramuscular injection, which act as depots and function as long-acting prodrugs. Non-17α-alkylated testosterone derivatives such as testosterone itself, DHT, and nandrolone all have poor oral bioavailability due to extensive first-pass hepatic metabolism and hence are not orally active. Similarly to the case of estrogenic activity, the progestogenic activity of these drugs serves to augment their antigonadotropic activity. In contrast, AAS that are 4,5α-reduced, and some other AAS (e.g., 11β-methylated 19-nortestosterone derivatives), have no risk of gynecomastia. Non-medical use of steroids is not permitted in the United States. Healthcare professionals use some types of steroids in medical treatment. They affect many body parts, including the muscles, bones, hair follicles, liver, kidneys, blood, immune system, reproductive system, and central nervous system. The drugs are artificially derived from the hormone testosterone. Different types include bulking, performance, and cutting steroids. Handelsman also notes that the term "anabolic steroid" is easily and unnecessarily confusable with corticosteroids. Although the term "anabolic–androgenic steroid" is technically valid in describing two types of actions of these agents, Handelsman considers the term to be unnecessary and redundant. It has also been noted that the use and distinction of the concepts "anabolic" and "androgenic", as well as the term "anabolic–androgenic steroid", are oxymoronic. Per Handelsman, the terms "anabolic steroid" and "anabolic–androgenic steroid" are obsolete, meaningless, and falsely distinguish these agents from androgens when there is no physiological basis for such distinction. In addition, it was related to misinterpretation of flawed animal androgen bioassays that had been employed to distinguish between androgenic or virilizing effects and anabolic or myotrophic effects (i.e., the Hershberger assay involving the unrepresentative levator ani muscle). Mood disturbances (e.g. depression, hypo-mania, psychotic features) are likely to be dose- and drug-dependent, but AAS dependence or withdrawal effects seem to occur only in a small number of AAS users. High concentrations of AAS, comparable to those likely sustained by many recreational AAS users, produce apoptotic effects on neurons,citation needed raising the specter of possibly irreversible neurotoxicity. Kidney tests revealed that nine of the ten steroid users developed a condition called focal segmental glomerulosclerosis, a type of scarring within the kidneys. All the different names for anti-inflammatory steroids aren’t the same as the anabolic steroids some athletes use to gain an unfair competitive advantage. Corticosteroids have a similar anti-inflammatory effect throughout your body, but in a way your provider can change and adjust to fit your needs. Corticosteroids (also called glucocorticoids or steroids) are prescription medications that reduce inflammation in your body. Corticosteroids can treat many causes of inflammation in your body. People will attend follow-up appointments and take periodic blood tests to monitor for unwanted effects. The adverse effects of AAS use depend on the product, the person’s age and sex, how much they use, and for how long. However, they may also be potentially available through anyone with prescriptive authority, including pharmacists, doctors, and veterinarians. As it is not legal for athletic purposes, there is no legal control over the quality or use of drugs sold for this purpose. These changes are also seen in non-drug-using athletes, but steroid use may accelerate this process. Possible effects of these alterations in the heart are hypertension, cardiac arrhythmias, congestive heart failure, heart attacks, and sudden cardiac death. For example, AAS may prematurely stop the lengthening of bones (premature epiphyseal fusion through increased levels of estrogen metabolites), resulting in stunted growth. AAS such as testosterone also increase the risk of cardiovascular disease or coronary artery disease. Most of these side-effects are dose-dependent, the most common being elevated blood pressure, especially in those with pre-existing hypertension. Misuse of anabolic steroids can be harmful to your health. Misuse of anabolic steroids can cause a variety of side effects ranging from mild to harmful or even life-threatening. Anabolic steroids (artificial androgens) work by activating androgen receptors in your body and mimicking the effects of natural androgens. Healthcare providers sometimes prescribe anabolic steroids for other conditions. Healthcare providers provide corticosteroids much more often than anabolic steroids. The technical term for these compounds is "anabolic-androgenic steroids" (AAS). Men can experience decreased sperm production, enlarged breasts, and male-pattern baldness. When AASs are used for body enhancement, they are typically taken in doses between 10 and 100 times higher than prescription doses. They can also be used off-label to reduce muscle wastage in diseases like AIDS. AASs may be prescribed for the treatment of select medical conditions. They use the energy your body generates to increase cell growth.