TMS-Induced LH Response in Healthy Women in Luteal Phase

Inclusion Criteria: * Healthy women aged 22-40 years with regular menstrual cycle. * In luteal phase at the time of visit. Exclusion Criteria: * Presence of any known structural brain abnormalities or tumors. * Presence of metal implants/devices in the head or neck. * Has ever had a stroke, seizure, or has a family history of epilepsy. * Head injury with loss of consciousness. * Use of hormonal contraceptives in the past 3 months. * Irregular menstrual cycles. * Diagnosed with a reproductive system disorder (e.g., PCOS, endometriosis, infertility, hypogonadism). * History of endocrine disorders such diabetes mellitus, thyroid disease, adrenal disorders, pituitary tumor or others. * Been diagnosed or received treatment for depression, anxiety disorder, schizophrenia, PTSD or bipolar disorder. * Have a history of medical disorder such liver or renal impairment, HIV/AIDS or unstable cardiac disease. * Taking any medications that affect the central nervous system such as antidepressents, antipsychotics, GLP-1 receptor agonists or hormone therapies. * Are you pregnant, planning pregnancy or breastfeeding. * Have experienced difficulties in the past during blood draws such as locating the vein, fainting or other adverse reactions. * Have any sleep disorder such as insomnia or sleep apnea. * Have fear of needles or the sight of blood. * Underwent TMS stimulation in the past and had difficulties.