Prasterone was discovered in 1934. An association between DHEA levels and aging was first reported in 1965. The compound started being used as a medication in the late 1970s and as a supplement in the early 1980s. The marketing of prasterone over-the-counter as a supplement is allowed in the United States but is banned in many other countries.
DHEA and DHEA sulfate are produced by the adrenal glands. In people with adrenal insufficiency such as in Addison's disease, there may be deficiency of DHEA and DHEA sulfate. In addition, levels of these steroids decrease throughout life and are 70 to 80% lower in the elderly relative to levels in young adults. Prasterone can be used to increase DHEA and DHEA sulfate levels in adrenal insufficiency and older age. Although there is deficiency of these steroids in such individuals, clinical benefits of supplementation, if any, are uncertain, and there is insufficient evidence at present to support the use of prasterone for such purposes.
Prasterone is produced naturally in the human body, but the long-term effects of its use are largely unknown. In the short term, several studies have noted few adverse effects. In a study by Chang et al., prasterone was administered at a dose of 200 mg/day for 24 weeks with slight androgenic effects noted. Another study utilized a dose up to 400 mg/day for 8 weeks with few adverse events reported. A longer term study followed patients dosed with 50 mg of prasterone for 12 months with the number and severity of side effects reported to be small. Another study delivered a dose of 50 mg of prasterone for 10 months with no serious adverse events reported.
As a hormone precursor, there have been reports of side effects possibly caused by the hormone metabolites of prasterone.
It is not known whether prasterone is safe for long-term use. Some researchers believe prasterone supplements might actually raise the risk of breast cancer, prostate cancer, heart disease, diabetes, and stroke. Prasterone may stimulate tumor growth in types of cancer that are sensitive to hormones, such as some types of breast, uterine, and prostate cancer. Prasterone may increase prostate swelling in men with benign prostatic hyperplasia (BPH), an enlarged prostate gland.
Prasterone is a steroid hormone. High doses may cause aggressiveness, irritability, trouble sleeping, and the growth of body or facial hair on women. It also may stop menstruation and lower the levels of HDL ("good" cholesterol), which could raise the risk of heart disease. Other reported side effects include acne, heart rhythm problems, liver problems, hair loss (from the scalp), and oily skin. It may also alter the body's regulation of blood sugar.
Prasterone may promote tamoxifen resistance in breast cancer. It may also increase the risk of uterine and prostate cancers due to metabolism into estrogens and androgens, respectively. Patients on hormone replacement therapy may have more estrogen-related side effects when taking prasterone. This supplement may also interfere with other medicines, and potential interactions between it and drugs and herbs are possible.
Prasterone is possibly unsafe for individuals experiencing pregnancy, breastfeeding, hormone sensitive conditions, liver problems, diabetes, depression or mood disorders, polycystic ovarian syndrome (PCOS), or cholesterol problems.
Prasterone has been reported to possess few or no side effects even at very high dosages (e.g., 50 times the recommended over-the-counter supplement dosage). However, it may cause masculinization and other androgenic side effects in women and gynecomastia and other estrogenic side effects in men.
In clinical studies of prasterone supplementation, dosages have ranged from 20 to 1,600 mg per day. In people with adrenal insufficiency, oral dosages of 20 to 50 mg/day prasterone have been found to restore DHEA and DHEA-S levels to normal ranges seen in healthy young adults. Conversely, oral dosages of 100 to 200 mg/day prasterone have been found to result in supraphysiological levels of DHEA and DHEA-S. At a high dosage of 1,600 mg/day orally for 4 weeks, treatment of postmenopausal women with prasterone has been found to increase serum levels of DHEA by 15-fold, testosterone by 9-fold, DHEA-S, androstenedione, and DHT all by 20-fold, and estrone and estradiol both by 2-fold.Micronization of prasterone has been found to significantly increase levels of DHEA-S achieved with oral administration but to produce no significant change in levels of DHEA or testosterone levels achieved.
Although prasterone can reliably increase testosterone levels in women, this isn't similarly the case in men. A high dosage of 1,600 mg/day prasterone in men for 4 weeks was found to increase DHEA and androstenedione levels but did not significantly affect testosterone levels.
DHEA was discovered, via isolation from male urine, by Adolf Butenandt and Hans Dannenbaum in 1934, and the compound was isolated from human blood plasma by Migeon and Plager in 1954. DHEA sulfate, the 3β-sulfateester of DHEA, was isolated from urine in 1944, and was found by Baulieu to be the most abundant steroid hormone in human plasma in 1954. From its discovery in 1934 until 1959, DHEA was referred to by a number of different names in the literature, including dehydroandrosterone, transdehydroandrosterone, dehydroisoandrosterone, and androstenolone. The name dehydroepiandrosterone, also known as DHEA, was first proposed by Fieser in 1949, and subsequently became the most commonly used name of the hormone. For decades after its discovery, DHEA was considered to be an inactive compound that served mainly as an intermediate in the production of androgens and estrogens from cholesterol. In 1965, an association between DHEA sulfate levels and aging was reported by De Nee and Vermeulen. Following this, DHEA became of interest to the scientific community, and numerous studies assessing the relationship between DHEA and DHEA sulfate levels and aging were conducted.
In 2001, Genelabs submitted a New Drug Application of prasterone for the treatment of systemic lupus erythematosus (SLE) to the FDA. It had the tentative brand names Anastar, Aslera, and Prestara. However, this application was not approved, and while development of prasterone for SLE in both the United States and Europe continued until up to 2010, the medication was ultimately never approved for the treatment of this condition. In 2016, the FDA approved prasterone in an intravaginal gel formulation for the treatment of painful sexual intercourse due to vulvovaginal atrophy in the United States under the brand name Intrarosa. This was the first prasterone-containing medication to be approved by the FDA in this country.
In the United States, prasterone or prasterone sulfate have been advertised, under the names DHEA and DHEA-S, with claims that they may be beneficial for a wide variety of ailments. Prasterone and prasterone sulfate are readily available in the United States, where they are sold as over-the-counterdietary supplements.
Prasterone is legal to sell in the United States as a dietary supplement. It is currently grandfathered in as an "Old Dietary Ingredient" being on sale prior to 1994. Prasterone is specifically exempted from the Anabolic Steroid Control Act of 1990 and 2004.
It is banned from use in athletic competition.
In Canada, prasterone is a Controlled Drug listed under Section 23 of Schedule IV of the Controlled Drugs and Substances Act and as such is available by prescription only.
In Australia, a prescription is required to buy prasterone, where it is also comparatively expensive compared to off-the-shelf purchases in US supplement shops. Australian customs classify prasterone as an "anabolic steroid[s] or precursor[s]" and, as such, it is only possible to carry prasterone into the country through customs if one possesses an import permit which may be obtained if one has a valid prescription for the hormone.
Prasterone is a prohibited substance under the World Anti-Doping Code of the World Anti-Doping Agency, which manages drug testing for Olympics and other sports. In January 2011, NBA player O. J. Mayo was given a 10-game suspension after testing positive for prasterone. Mayo termed his use of prasterone as "an honest mistake," saying the prasterone was in an over-the-counter supplement and that he was unaware the supplement was banned by the NBA. Mayo is the seventh player to test positive for performance-enhancing drugs since the league began testing in 1999. Rashard Lewis, then with the Orlando Magic, tested positive for prasterone and was suspended 10 games before the start of the 2009-10 season. 2008 Olympic 400 meter champion Lashawn Merritt has also tested positive for prasterone and was banned from the sport for 21 months.Yulia Efimova, who holds the world record pace for both the 50-meter and 200-meter breaststroke, and won the bronze medal in the 200-meter breaststroke in the 2012 London Olympic Games, tested positive for prasterone in an out-of-competition doping test. In 2016 MMA fighter Fabio Maldonado revealed he was taking prasterone during his time with the UFC.
A meta-analysis of intervention studies shows that prasterone supplementation in elderly men can induce a small but significant positive effect on body composition that is strictly dependent on prasterone conversion into its bioactive metabolites such as androgens or estrogens. Evidence is inconclusive in regards to the effect of prasterone on strength in the elderly. In middle-aged men, no significant effect of prasterone supplementation on lean body mass, strength, or testosterone levels was found in a randomized placebo-controlled trial.
There is no evidence prasterone is of benefit in treating or preventing cancer.
A review in 2003 found the then-extant evidence sufficient to suggest that low serum levels of DHEA-S may be associated with coronary heart disease in men, but insufficient to determine whether prasterone supplementation would have any cardiovascular benefit.
Prasterone may enhance G6PD mRNA expression, confounding its inhibitory effects.
There is some evidence of short-term benefit in those with SLE but little evidence of long-term benefit or safety. Prasterone was under development for the treatment of systemic lupus erythematosus in the United States and Europe in the 1990s and 2000s and reached phase IIIclinical trials and preregistration for this indication, respectively, but ultimately development was not continued past 2010.
Prasterone supplementation has not been found to be useful for memory function in normal middle aged or older adults. It has been studied as a treatment for Alzheimer's disease, but there is no evidence that it is effective.
A few small, short term clinical studies have found that prasterone improves mood but its long-term efficacy and safety, and how it compares to antidepressants, was unknown as of 2015.
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