Inclusion Criteria:  • Male sex  18 - 50 years of age Hypogonadism following observational period of a minimum of 12 weeks since AAS discontinuation OR hypogonadism with a urine sample negative for AAS analyses at screening visit: plasma total testosterone ≤ 10 nmol/L AND featuring at least one symptom of male hypogonadism using IIEF in terms of erectile function (IIEF: Q1 - Q5 + Q15; total score < 26) and/or sexual desire (IIEF: Q11 + Q12; total < 7) (1) and/or ADAM questionnaire (YES to three questions other than question 1 and 7) and/or regular use of medical treatment for erectile dysfunction. Motivation for permanent AAS cessation  Exclusion Criteria:  Established cardiovascular disease  Established diabetes of any kind 384 Congenital hypogonadal conditions (cryptorchidism, Klinefelter's disease, Kallmann's disease etc.) Previous established hypogonadal conditions due to other causes than illicit use of AAS Current or previous treatment with testosterone on other indication than AAS-induced male hypogonadism Abnormal puberty development (small testes, late or absent pubic hairing, late or absent deepening of voice, etc.) Current or previous pituitary diseases including pituitary tumors Current or previous tumors of the hypothalamus Current or former testicular cancer Current or previous prostate cancer Current or previous breast cancer Other cancers unless complete remission ≥ 5 year Other concomitant disease or makes the patient unsuitable to participate in the study Severely impaired liver function Allergy or hypersensitivity to the active substance (letrozole) or excipients of Letrozol "Accord"® listed in Appendix D Allergy or hypersensitivity to the active substance (hCG) or excipients of Brevactid® listed in Appendix D Established Lapp lactase deficiency or glucose/galactose malabsorption Severe venous phlebitis or current or previous venous thromboembolism Inguinal hernia treatment which according to the investigators' assessment Simultaneous participation in another clinical study Unable to follow treatment instructions in terms of study medication instructions Ongoing criminal behavior in terms of violence or illicit distribution of drugs Currently or in the foreseeable future included in anti-doping programs