Normal puberty with respect to onset and pace No history of chronic disease No prescription medications for at least 2 months except for seasonal allergy medications No illicit drug use No excessive alcohol consumption (< 10 drinks/week) No history of a medication reaction requiring emergency medical care No difficulty with blood draws Not currently seeking fertility Body Mass Index (BMI) > 18.5 and < 30 kg/m2 Normal blood pressure (BP) (systolic BP < 140 mm Hg, diastolic < 90 mm Hg) White blood cell, platelet counts, prolactin, and Thyroid Stimulating Hormone (TSH) between 90% of the lower limit and 110% of the upper limit of the reference range Normal hemoglobin Blood urea nitrogen (BUN), creatinine not elevated Aspartate aminotransferase (AST), alanine transaminase (ALT) <2x upper limit of reference range Normal levels of LH, Follicle Stimulating Hormone (FSH), and sex steroids (estradiol or testosterone) Negative urine drug screening panel  For men:  Normal erectile and ejaculatory function by report, no history of reproductive disorders (i.e. no history of cryptorchidism) Testicular volume >15 ml by Prader orchidometer  For women:  Menstrual cycles between 25 and 35 days in duration, at least 11 periods/year, with no more than 5 days variability in cycle duration No oral contraceptives for at least 1 month No evidence for androgen excess (hirsutism or acne) Not breastfeeding and not pregnant Negative serum human chorionic gonadotropin (hCG) pregnancy test at the time of screening, (additional urine pregnancy test will be conducted prior to drug administration)