Testosterone

    Last Updated: October 13, 2024

    Testosterone is the best-known androgen (male hormone), but females produce it too. In both sexes, low testosterone can reduce libido and cause fat gain, muscle loss, and bone loss.

    examine-databaseExamine Database
    23 references on this page
    20,373 participants in 162 trials

    Overview

    Testosterone is a hormone produced primarily in the testes in men and the ovaries in women. Testosterone is connected to sexual development, muscle building, fat loss, some aspects of cognition, and hair loss.[1]

    A history of testosterone

    Your testosterone levels may not tell the whole story of how testosterone is functioning in your body. Total testosterone can be divided into three categories.[2]

    • Tightly bound testosterone: About two-thirds of the testosterone in your blood is bound to sex hormone binding globulin (SHBG). It is not readily available for use by your body.
    • Loosely bound testosterone: About one-third of the testosterone in your blood is weakly bound to albumin. Once the bond is broken, the testosterone circulates as free testosterone in your body.
    • Free testosterone: A small percentage of the testosterone in your blood (1–4%, as a rule) floats around freely. Your body can readily use it, and the enzyme 5-alpha-reductase can convert it to dihydrotestosterone (DHT), a very potent androgen.

    Together, your loosely bound and free testosterone compose your bioavailable testosterone, which has a greater impact on your health than your total testosterone.

    How are testosterone levels assessed?

    A blood test is used to assess testosterone and its components (free T, bound T, etc). Abnormally low or high levels can cause health issues in males and females.

    When your T levels are tested, the reference range can vary a lot from lab to lab. A recent study showed that the bottom of the range for males can be 5.55–10.4 nanomoles per liter, or nmol/L (160–300 nanograms per deciliter, or ng/dL), and the top of the range can be 25.17–39.18 nmol/L (726–1,130 ng/dL).[3] So if you get measured at 280 ng/dL, you may or may not be considered as having “low testosterone”.[3]

    Because testosterone levels can fluctuate throughout the day, the test should be performed in the morning (8–11 a.m.). If the results come back low, a second test can be ordered to confirm the first result. As part of the workup, your physician may also measure your levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and the T4 thyroid hormone (thyroxine) to get an accurate diagnosis.

    Assessing testosterone levels

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    Examine Database: Testosterone

    DHEA
    B
    Moderate Increase
    Inositol
    B
    Small Decrease
    Ketogenic Diet
    D
    No effect
    Alcohol
    Vitamin D
    Berberine
    Tribulus Terrestris
    Tongkat Ali
    Ashwagandha
    Licorice
    N-Acetylcysteine
    Creatine
    D-Aspartic Acid
    Red Clover Extract
    Zinc
    Caffeine
    Maca
    Panax Ginseng (Korean Ginseng)
    HMB
    Resveratrol
    Magnesium
    Boron
    Velvet Antler
    Fenugreek
    Coenzyme Q10
    Saffron
    Chromium
    Saw Palmetto
    Colostrum
    L-Carnitine
    16:8 Intermittent Fasting
    Rhodiola Rosea
    Garcinia
    Coleus forskohlii
    Curcumin
    Stinging Nettle
    Ginger
    Yohimbine
    Alanylglutamine
    Beta-Alanine
    Phosphatidylserine
    Glutamine
    Arginine
    Green Tea Extract
    Punicalagins
    Grape Seed Extract
    Chrysin
    Gamma Oryzanol
    Astaxanthin
    Calcium
    Shilajit
    Nicotine
    Cannabis
    Ecdysteroids
    7-Keto DHEA
    Arachidonic Acid
    Fish Oil
    Korean black raspberry
    Royal Jelly
    Reishi
    Flaxseed

    Research FeedRead all studies

    References

    1. ^The content of this page was partially adapted from MedlinePlus of the National Library of Medicine
    2. ^Anna L Goldman, Shalender Bhasin, Frederick C W Wu, Meenakshi Krishna, Alvin M Matsumoto, Ravi JasujaA Reappraisal of Testosterone's Binding in Circulation: Physiological and Clinical ImplicationsEndocr Rev.(2017 Aug 1)
    3. ^Le M, Flores D, May D, Gourley E, Nangia AKCurrent Practices of Measuring and Reference Range Reporting of Free and Total Testosterone in the United StatesJ Urol.(2016 May)
    4. ^Cote KA, McCormick CM, Geniole SN, Renn RP, MacAulay SDSleep deprivation lowers reactive aggression and testosterone in menBiol Psychol.(2013 Feb)
    5. ^Leproult R, Van Cauter EEffect of 1 week of sleep restriction on testosterone levels in young healthy menJAMA.(2011 Jun 1)
    6. ^Penev PDAssociation between sleep and morning testosterone levels in older menSleep.(2007 Apr)
    7. ^González-Santos MR, Gajá-Rodríguez OV, Alonso-Uriarte R, Sojo-Aranda I, Cortés-Gallegos VSleep deprivation and adaptive hormonal responses of healthy menArch Androl.(1989)
    8. ^Cortés-Gallegos V, Castañeda G, Alonso R, Sojo I, Carranco A, Cervantes C, Parra ASleep deprivation reduces circulating androgens in healthy menArch Androl.(1983 Mar)
    9. ^Nedeltcheva AV, Kilkus JM, Imperial J, Schoeller DA, Penev PDInsufficient sleep undermines dietary efforts to reduce adiposityAnn Intern Med.(2010 Oct 5)
    10. ^Grossmann MLow testosterone in men with type 2 diabetes: significance and treatmentJ Clin Endocrinol Metab.(2011 Aug)
    11. ^Tajar A, Forti G, O'Neill TW, Lee DM, Silman AJ, Finn JD, Bartfai G, Boonen S, Casanueva FF, Giwercman A, Han TS, Kula K, Labrie F, Lean ME, Pendleton N, Punab M, Vanderschueren D, Huhtaniemi IT, Wu FC, EMAS GroupCharacteristics of secondary, primary, and compensated hypogonadism in aging men: evidence from the European Male Ageing StudyJ Clin Endocrinol Metab.(2010 Apr)
    12. ^Hall SA, Esche GR, Araujo AB, Travison TG, Clark RV, Williams RE, McKinlay JBCorrelates of low testosterone and symptomatic androgen deficiency in a population-based sampleJ Clin Endocrinol Metab.(2008 Oct)
    13. ^Corona G, Rastrelli G, Monami M, Saad F, Luconi M, Lucchese M, Facchiano E, Sforza A, Forti G, Mannucci E, Maggi MBody weight loss reverts obesity-associated hypogonadotropic hypogonadism: a systematic review and meta-analysisEur J Endocrinol.(2013 May 2)
    14. ^Camacho EM, Huhtaniemi IT, O'Neill TW, Finn JD, Pye SR, Lee DM, Tajar A, Bartfai G, Boonen S, Casanueva FF, Forti G, Giwercman A, Han TS, Kula K, Keevil B, Lean ME, Pendleton N, Punab M, Vanderschueren D, Wu FC, EMAS GroupAge-associated changes in hypothalamic-pituitary-testicular function in middle-aged and older men are modified by weight change and lifestyle factors: longitudinal results from the European Male Ageing StudyEur J Endocrinol.(2013 Feb 20)
    15. ^O'Leary CB, Hackney ACAcute and chronic effects of resistance exercise on the testosterone and cortisol responses in obese males: a systematic reviewPhysiol Res.(2014)
    16. ^Kraemer WJ, Ratamess NAHormonal responses and adaptations to resistance exercise and trainingSports Med.(2005)
    17. ^Daly W, Seegers CA, Rubin DA, Dobridge JD, Hackney ACRelationship between stress hormones and testosterone with prolonged endurance exerciseEur J Appl Physiol.(2005 Jan)
    18. ^Hackney AC, Aggon EChronic Low Testosterone Levels in Endurance Trained Men: The Exercise- Hypogonadal Male ConditionJ Biochem Physiol.(2018)
    19. ^Feldman HA, Longcope C, Derby CA, Johannes CB, Araujo AB, Coviello AD, Bremner WJ, McKinlay JBAge trends in the level of serum testosterone and other hormones in middle-aged men: longitudinal results from the Massachusetts male aging studyJ Clin Endocrinol Metab.(2002 Feb)
    20. ^Wu FC, Tajar A, Pye SR, Silman AJ, Finn JD, O'Neill TW, Bartfai G, Casanueva F, Forti G, Giwercman A, Huhtaniemi IT, Kula K, Punab M, Boonen S, Vanderschueren D, European Male Aging Study GroupHypothalamic-pituitary-testicular axis disruptions in older men are differentially linked to age and modifiable risk factors: the European Male Aging StudyJ Clin Endocrinol Metab.(2008 Jul)
    21. ^Handelsman DJ, Yeap B, Flicker L, Martin S, Wittert GA, Ly LPAge-specific population centiles for androgen status in menEur J Endocrinol.(2015 Dec)
    22. ^G W DeVane, N M Czekala, H L Judd, S S YenCirculating gonadotropins, estrogens, and androgens in polycystic ovarian diseaseAm J Obstet Gynecol.(1975 Feb 15)
    23. ^Schulster M, Bernie AM, Ramasamy RThe role of estradiol in male reproductive functionAsian J Androl.(2016 May-Jun)

    Examine Database References

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    2. Ginger - Waleed Abid Al-Kadir Mares, Wisam S. NajamThe effect of Ginger on semen parameters and serum FSH, LH & testosterone of infertile menTikrit Medical Journal.()
    3. DHEA - Stomati M, Monteleone P, Casarosa E, Quirici B, Puccetti S, Bernardi F, Genazzani AD, Rovati L, Luisi M, Genazzani ARSix-month oral dehydroepiandrosterone supplementation in early and late postmenopauseGynecol Endocrinol.(2000 Oct)
    4. D-Aspartic Acid - mma D’Aniello, Salvatore Ronsini, Tiziana Notari, Natascia Grieco, Vincenzo Infante, Nicola D’Angel, Fara Mascia, Maria Maddalena Di Fiore, George Fisher, Antimo D’AnielloD-Aspartate, a Key Element for the Improvement of Sperm QualityMedicine and Healthcare.()
    5. Cannabis - E B De Sousa Fernandes Perna, E L Theunissen, K P C Kuypers, S W Toennes, J G RamaekersSubjective aggression during alcohol and cannabis intoxication before and after aggression exposurePsychopharmacology (Berl).(2016 Sep)
    6. Red Clover Extract - Lee CC, Bloem CJ, Kasa-Vubu JZ, Liang LJEffect of oral phytoestrogen on androgenicity and insulin sensitivity in postmenopausal womenDiabetes Obes Metab.(2012 Apr)
    7. Tribulus Terrestris - Roaiah MF, El Khayat YI, GamalEl Din SF, Abd El Salam MAPilot Study on the Effect of Botanical Medicine (Tribulus terrestris) on Serum Testosterone Level and Erectile Function in Aging Males With Partial Androgen Deficiency (PADAM)J Sex Marital Ther.(2016 May 18)
    8. Ashwagandha - Gupta A, Mahdi AA, Shukla KK, Ahmad MK, Bansal N, Sankhwar P, Sankhwar SNEfficacy of Withania somnifera on seminal plasma metabolites of infertile males: a proton NMR study at 800 MHzJ Ethnopharmacol.(2013 Aug 26)
    9. Tribulus Terrestris - Neychev VK, Mitev VIThe aphrodisiac herb Tribulus terrestris does not influence the androgen production in young menJ Ethnopharmacol.(2005 Oct 3)
    10. Ashwagandha - Wankhede S, Langade D, Joshi K, Sinha SR, Bhattacharyya SExamining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trialJ Int Soc Sports Nutr.(2015 Nov 25)
    11. DHEA - Martina V, Benso A, Gigliardi VR, Masha A, Origlia C, Granata R, Ghigo EShort-term dehydroepiandrosterone treatment increases platelet cGMP production in elderly male subjectsClin Endocrinol (Oxf).(2006 Mar)
    12. D-Aspartic Acid - Darryn S. Willoughby, Brian Leutholtzd-Aspartic acid supplementation combined with 28 days of heavy resistance training has no effect on body composition, muscle strength, and serum hormones associated with the hypothalamo-pituitary-gonadal axis in resistance-trained menNutrition Research.()
    13. Calcium - Vedat Cinar, Abdulkerim Kasim Baltaci, Rasim Mogulkoc, Mehmet KilicTestosterone levels in athletes at rest and exhaustion: effects of calcium supplementationBiol Trace Elem Res.(Summer 2009)
    14. Alcohol - Välimäki MJ, Härkönen M, Eriksson CJ, Ylikahri RHSex hormones and adrenocortical steroids in men acutely intoxicated with ethanolAlcohol.(1984 Jan-Feb)
    15. Ecdysteroids - Wilborn CD, Taylor LW, Campbell BI, Kerksick C, Rasmussen CJ, Greenwood M, Kreider RBEffects of methoxyisoflavone, ecdysterone, and sulfo-polysaccharide supplementation on training adaptations in resistance-trained malesJ Int Soc Sports Nutr.(2006 Dec 13)
    16. Velvet Antler - Sleivert G, Burke V, Palmer C, Walmsley A, Gerrard D, Haines S, Littlejohn RThe effects of deer antler velvet extract or powder supplementation on aerobic power, erythropoiesis, and muscular strength and endurance characteristicsInt J Sport Nutr Exerc Metab.(2003 Sep)
    17. Tribulus Terrestris - Roaiah MF, Elkhayat YI, Saleh SF, Abd El Salam MAProspective Analysis on the Effect of Botanical Medicine (Tribulus terrestris) on Serum Testosterone Level and Semen Parameters in Males with Unexplained InfertilityJ Diet Suppl.(2016 Jun 23)
    18. Curcumin - Choi YH, Han DH, Kim SW, Kim MJ, Sung HH, Jeon HG, Jeong BC, Seo SI, Jeon SS, Lee HM, Choi HYA randomized, double-blind, placebo-controlled trial to evaluate the role of curcumin in prostate cancer patients with intermittent androgen deprivationProstate.(2019 May)
    19. Panax Ginseng (Korean Ginseng) - de Andrade E, de Mesquita AA, Claro Jde A, de Andrade PM, Ortiz V, Paranhos M, Srougi MStudy of the efficacy of Korean Red Ginseng in the treatment of erectile dysfunctionAsian J Androl.(2007 Mar)
    20. Magnesium - Cinar V, Polat Y, Baltaci AK, Mogulkoc REffects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustionBiol Trace Elem Res.(2011 Apr)
    21. DHEA - Muller M, van den Beld AW, van der Schouw YT, Grobbee DE, Lamberts SWEffects of dehydroepiandrosterone and atamestane supplementation on frailty in elderly menJ Clin Endocrinol Metab.(2006 Oct)
    22. Licorice - R A Josephs, J S Guinn, M L Harper, F AskariLiquorice consumption and salivary testosterone concentrationsLancet.(2001 Nov 10)
    23. Vitamin D - Elisabeth Lerchbaum, Christian Trummer, Verena Theiler-Schwetz, Martina Kollmann, Monika Wölfler, Annemieke C Heijboer, Stefan Pilz, Barbara Obermayer-PietschEffects of vitamin D supplementation on androgens in men with low testosterone levels: a randomized controlled trialEur J Nutr.(2019 Dec)
    24. Boron - Green NR, Ferrando AAPlasma boron and the effects of boron supplementation in malesEnviron Health Perspect.(1994 Nov)
    25. Red Clover Extract - Hidalgo LA, Chedraui PA, Morocho N, Ross S, San Miguel GThe effect of red clover isoflavones on menopausal symptoms, lipids and vaginal cytology in menopausal women: a randomized, double-blind, placebo-controlled studyGynecol Endocrinol.(2005 Nov)
    26. Alcohol - Sierksma A, Sarkola T, Eriksson CJ, van der Gaag MS, Grobbee DE, Hendriks HFEffect of moderate alcohol consumption on plasma dehydroepiandrosterone sulfate, testosterone, and estradiol levels in middle-aged men and postmenopausal women: a diet-controlled intervention studyAlcohol Clin Exp Res.(2004 May)
    27. Stinging Nettle - Safarinejad MRUrtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover studyJ Herb Pharmacother.(2005)
    28. DHEA - Weiss EP, Shah K, Fontana L, Lambert CP, Holloszy JO, Villareal DTDehydroepiandrosterone replacement therapy in older adults: 1- and 2-y effects on boneAm J Clin Nutr.(2009 May)
    29. Tongkat Ali - Shawn M Talbott, Julie A Talbott, Annie George, and Mike PughEffect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjectsJISSN.()
    30. Zinc - Netter A, Hartoma R, Nahoul KEffect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm countArch Androl.(1981 Aug)
    31. Creatine - Volek JS, Ratamess NA, Rubin MR, Gómez AL, French DN, McGuigan MM, Scheett TP, Sharman MJ, Häkkinen K, Kraemer WJThe effects of creatine supplementation on muscular performance and body composition responses to short-term resistance training overreachingEur J Appl Physiol.(2004 May)
    32. Maca - Gonzales GF, Córdova A, Vega K, Chung A, Villena A, Góñez C, Castillo SEffect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy menAndrologia.(2002 Dec)
    33. Vitamin D - Małgorzata Magdalena Michalczyk, Artur Gołaś, Adam Maszczyk, Piotr Kaczka, Adam ZającInfluence of Sunlight and Oral D 3 Supplementation on Serum 25(OH)D Concentration and Exercise Performance in Elite Soccer PlayersNutrients.(2020 May 4)
    34. 16:8 Intermittent Fasting - Tatiana Moro, Grant Tinsley, Antonino Bianco, Giuseppe Marcolin, Quirico Francesco Pacelli, Giuseppe Battaglia, Antonio Palma, Paulo Gentil, Marco Neri, Antonio PaoliEffects of eight weeks of time-restricted feeding (16/8) on basal metabolism, maximal strength, body composition, inflammation, and cardiovascular risk factors in resistance-trained malesJ Transl Med.(2016 Oct 13)
    35. Zinc - Kilic M, Baltaci AK, Gunay M, Gökbel H, Okudan N, Cicioglu IThe effect of exhaustion exercise on thyroid hormones and testosterone levels of elite athletes receiving oral zincNeuro Endocrinol Lett.(2006 Feb-Apr)
    36. DHEA - Libè R, Barbetta L, Dall'Asta C, Salvaggio F, Gala C, Beck-Peccoz P, Ambrosi BEffects of dehydroepiandrosterone (DHEA) supplementation on hormonal, metabolic and behavioral status in patients with hypoadrenalismJ Endocrinol Invest.(2004 Sep)
    37. Beta-Alanine - Hoffman J, Ratamess NA, Ross R, Kang J, Magrelli J, Neese K, Faigenbaum AD, Wise JABeta-alanine and the hormonal response to exerciseInt J Sports Med.(2008 Dec)
    38. Ashwagandha - Lopresti AL, Smith SJ, Malvi H, Kodgule RAn investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: A randomized, double-blind, placebo-controlled studyMedicine (Baltimore).(2019 Sep)
    39. Fenugreek - Steels E, Rao A, Vitetta LPhysiological Aspects of Male Libido Enhanced by Standardized Trigonella foenum-graecum Extract and Mineral FormulationPhytother Res.(2011 Feb 10)
    40. Garcinia - Hayamizu K, Tomi H, Kaneko I, Shen M, Soni MG, Yoshino GEffects of Garcinia cambogia extract on serum sex hormones in overweight subjectsFitoterapia.(2008 Jun)
    41. Licorice - Helga Agusta Sigurjonsdottir, Magnus Axelson, Gudmundur Johannsson, Karin Manhem, Ernst Nystrom, Sven WallerstedtLiquorice in moderate doses does not affect sex steroid hormones of biological importance although the effect differs between the gendersHorm Res.(2006)
    42. DHEA - Kenny AM, Boxer RS, Kleppinger A, Brindisi J, Feinn R, Burleson JADehydroepiandrosterone combined with exercise improves muscle strength and physical function in frail older womenJ Am Geriatr Soc.(2010 Sep)
    43. Saw Palmetto - Bent S, Kane C, Shinohara K, Neuhaus J, Hudes ES, Goldberg H, Avins ALSaw palmetto for benign prostatic hyperplasiaN Engl J Med.(2006 Feb 9)
    44. Tongkat Ali - M I B M Tambi, M K Imran, R R HenkelStandardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism?Andrologia.(2012 May)
    45. Maca - Zenico T, Cicero AF, Valmorri L, Mercuriali M, Bercovich ESubjective effects of Lepidium meyenii (Maca) extract on well-being and sexual performances in patients with mild erectile dysfunction: a randomised, double-blind clinical trialAndrologia.(2009 Apr)
    46. Saffron - Fukui H, Toyoshima K, Komaki RPsychological and neuroendocrinological effects of odor of saffron (Crocus sativus)Phytomedicine.(2011 Jun 15)
    47. Panax Ginseng (Korean Ginseng) - Salvati G, Genovesi G, Marcellini L, Paolini P, De Nuccio I, Pepe M, Re MEffects of Panax Ginseng C.A. Meyer saponins on male fertilityPanminerva Med.(1996 Dec)
    48. Coleus forskohlii - Godard MP, Johnson BA, Richmond SRBody composition and hormonal adaptations associated with forskolin consumption in overweight and obese menObes Res.(2005 Aug)
    49. L-Carnitine - G Cavallini, S Caracciolo, G Vitali, F Modenini, G BiagiottiCarnitine versus androgen administration in the treatment of sexual dysfunction, depressed mood, and fatigue associated with male agingUrology.(2004 Apr)
    50. Colostrum - Shing CM, Peake JM, Suzuki K, Jenkins DG, Coombes JSA pilot study: bovine colostrum supplementation and hormonal and autonomic responses to competitive cyclingJ Sports Med Phys Fitness.(2013 Oct)
    51. Alcohol - Sarkola T, Fukunaga T, Mäkisalo H, Peter Eriksson CJAcute effect of alcohol on androgens in premenopausal womenAlcohol Alcohol.(2000 Jan)
    52. DHEA - Yamada S, Akishita M, Fukai S, Ogawa S, Yamaguchi K, Matsuyama J, Kozaki K, Toba K, Ouchi YEffects of dehydroepiandrosterone supplementation on cognitive function and activities of daily living in older women with mild to moderate cognitive impairmentGeriatr Gerontol Int.(2010 Oct)
    53. Maca - Melnikovova I, Fait T, Kolarova M, Fernandez EC, Milella LEffect of Lepidium meyenii Walp. on Semen Parameters and Serum Hormone Levels in Healthy Adult Men: A Double-Blind, Randomized, Placebo-Controlled Pilot StudyEvid Based Complement Alternat Med.(2015)
    54. D-Aspartic Acid - Topo E, Soricelli A, D'Aniello A, Ronsini S, D'Aniello GThe role and molecular mechanism of D-aspartic acid in the release and synthesis of LH and testosterone in humans and ratsReprod Biol Endocrinol.(2009 Oct 27)
    55. DHEA - Morales A, Black A, Emerson L, Barkin J, Kuzmarov I, Day AAndrogens and sexual function: a placebo-controlled, randomized, double-blind study of testosterone vs. dehydroepiandrosterone in men with sexual dysfunction and androgen deficiencyAging Male.(2009 Dec)
    56. Arginine - Abel T, Knechtle B, Perret C, Eser P, von Arx P, Knecht HInfluence of chronic supplementation of arginine aspartate in endurance athletes on performance and substrate metabolism - a randomized, double-blind, placebo-controlled studyInt J Sports Med.(2005 Jun)
    57. DHEA - Ostojic SM, Calleja J, Jourkesh MEffects of short-term dehydroepiandrosterone supplementation on body composition in young athletesChin J Physiol.(2010 Feb 28)
    58. DHEA - Jedrzejuk D, Medras M, Milewicz A, Demissie MDehydroepiandrosterone replacement in healthy men with age-related decline of DHEA-S: effects on fat distribution, insulin sensitivity and lipid metabolismAging Male.(2003 Sep)
    59. Vitamin D - Juan Mielgo-Ayuso, Julio Calleja-González, Aritz Urdampilleta, Patxi León-Guereño, Alfredo Córdova, Alberto Caballero-García, Diego Fernandez-LázaroEffects of Vitamin D Supplementation on Haematological Values and Muscle Recovery in Elite Male Traditional RowersNutrients.(2018 Dec 12)
    60. Coenzyme Q10 - Izadi A, Ebrahimi S, Shirazi S, Taghizadeh S, Parizad M, Farzadi L, Gargari BPHormonal and Metabolic Effects of Coenzyme Q10 and/or Vitamin E in Patients With Polycystic Ovary SyndromeJ Clin Endocrinol Metab.(2019 Feb 1)
    61. Zinc - Kilic MEffect of fatiguing bicycle exercise on thyroid hormone and testosterone levels in sedentary males supplemented with oral zincNeuro Endocrinol Lett.(2007 Oct)
    62. Boron - Naghii MR, Mofid M, Asgari AR, Hedayati M, Daneshpour MSComparative effects of daily and weekly boron supplementation on plasma steroid hormones and proinflammatory cytokinesJ Trace Elem Med Biol.(2011 Jan)
    63. Tribulus Terrestris - de Souza KZ, Vale FB, Geber SEfficacy of Tribulus terrestris for the treatment of hypoactive sexual desire disorder in postmenopausal women: a randomized, double-blinded, placebo-controlled trialMenopause.(2016 Nov)
    64. Licorice - Armanini D, Bonanni G, Palermo MReduction of serum testosterone in men by licoriceN Engl J Med.(1999 Oct 7)
    65. Tribulus Terrestris - Sellandi TM, Thakar AB, Baghel MSClinical study of Tribulus terrestris Linn. in Oligozoospermia: A double blind studyAyu.(2012 Jul)
    66. Boron - Nielsen FH, Hunt CD, Mullen LM, Hunt JREffect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal womenFASEB J.(1987 Nov)
    67. Yohimbine - Guay AT, Spark RF, Jacobson J, Murray FT, Geisser MEYohimbine treatment of organic erectile dysfunction in a dose-escalation trialInt J Impot Res.(2002 Feb)
    68. Vitamin D - Armin Zittermann, Jana B Ernst, Sylvana Prokop, Uwe Fuchs, Jens Dreier, Joachim Kuhn, Cornelius Knabbe, Heiner K Berthold, Ioanna Gouni-Berthold, Jan F Gummert, Jochen Börgermann, Stefan PilzVitamin D supplementation does not prevent the testosterone decline in males with advanced heart failure: the EVITA trialEur J Nutr.(2019 Mar)
    69. HMB - Wilson JM, Lowery RP, Joy JM, Walters JA, Baier SM, Fuller JC, Stout JR, Norton LE, Sikorski EM, Wilson SM, Duncan NM, Zanchi NE, Rathmacher Jβ-Hydroxy-β-methylbutyrate free acid reduces markers of exercise-induced muscle damage and improves recovery in resistance-trained menBr J Nutr.(2013 Jan 3)
    70. Creatine - van der Merwe J, Brooks NE, Myburgh KHThree weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby playersClin J Sport Med.(2009 Sep)
    71. Tribulus Terrestris - Rogerson S, Riches CJ, Jennings C, Weatherby RP, Meir RA, Marshall-Gradisnik SMThe effect of five weeks of Tribulus terrestris supplementation on muscle strength and body composition during preseason training in elite rugby league playersJ Strength Cond Res.(2007 May)
    72. Licorice - Armanini D, Bonanni G, Mattarello MJ, Fiore C, Sartorato P, Palermo MLicorice consumption and serum testosterone in healthy manExp Clin Endocrinol Diabetes.(2003 Sep)
    73. Caffeine - Beaven CM, Hopkins WG, Hansen KT, Wood MR, Cronin JB, Lowe TEDose effect of caffeine on testosterone and cortisol responses to resistance exerciseInt J Sport Nutr Exerc Metab.(2008 Apr)
    74. Saffron - Safarinejad MR, Shafiei N, Safarinejad SA prospective double-blind randomized placebo-controlled study of the effect of saffron (Crocus sativus Linn.) on semen parameters and seminal plasma antioxidant capacity in infertile men with idiopathic oligoasthenoteratozoospermiaPhytother Res.(2011 Apr)
    75. DHEA - Igwebuike A, Irving BA, Bigelow ML, Short KR, McConnell JP, Nair KSLack of dehydroepiandrosterone effect on a combined endurance and resistance exercise program in postmenopausal womenJ Clin Endocrinol Metab.(2008 Feb)
    76. Korean black raspberry - Ji Eun Lee, Eunkyo Park, Jung Eun Lee, Joong Hyuck Auh, Hyung-Kyoon Choi, Jaehwi Lee, Soomuk Cho, Jung-Hyun KimEffects of a Rubus coreanus Miquel supplement on plasma antioxidant capacity in healthy Korean menNutr Res Pract.(2011 Oct)
    77. Phosphatidylserine - Parker AG, Gordon J, Thornton A, Byars A, Lubker J, Bartlett M, Byrd M, Oliver J, Simbo S, Rasmussen C, Greenwood M, Kreider RBThe effects of IQPLUS Focus on cognitive function, mood and endocrine response before and following acute exerciseJ Int Soc Sports Nutr.(2011 Oct 21)
    78. Alcohol - Mendelson JH, Mello NK, Ellingboe JEffects of acute alcohol intake on pituitary-gonadal hormones in normal human malesJ Pharmacol Exp Ther.(1977 Sep)
    79. DHEA - Liu TC, Lin CH, Huang CY, Ivy JL, Kuo CHEffect of acute DHEA administration on free testosterone in middle-aged and young men following high-intensity interval trainingEur J Appl Physiol.(2013 Feb 17)
    80. D-Aspartic Acid - Melville GW, Siegler JC, Marshall PWThree and six grams supplementation of d-aspartic acid in resistance trained menJ Int Soc Sports Nutr.(2015 Apr 1)
    81. DHEA - Alessandro D Genazzani, Massimo Stomati, Francesca Bernardi, Matteo Pieri, Lucio Rovati, Andrea R GenazzaniLong-term low-dose dehydroepiandrosterone oral supplementation in early and late postmenopausal women modulates endocrine parameters and synthesis of neuroactive steroidsFertil Steril.(2003 Dec)
    82. Caffeine - Cook C, Beaven CM, Kilduff LP, Drawer SAcute caffeine ingestion increases voluntarily chosen resistance training load following limited sleepInt J Sport Nutr Exerc Metab.(2012 Feb 15)
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