In this Huberman Lab Essentials episode, I explain the crucial role hormones play in shaping the sexual development of both the brain and body. I discuss how biological masculinization and feminization depend on factors such as genetics, hormone ratios, and receptor availability. I also explore how hormones like testosterone, estrogen, and other steroid hormones influence sexual characteristics and brain development. Additionally, I examine the impact of environmental factors—such as herbicides like atrazine, cannabis, alcohol, and even cell phones—on hormone function and reproductive health. Episode show notes: https://go.hubermanlab.com/Do6MuHz Huberman Lab Essentials are short episodes focused on essential science and protocol takeaways from past full-length Huberman Lab episodes. Watch or listen to the full-length episode: https://youtu.be/J7SrAEacyf8 Watch more Huberman Lab Essentials episodes: https://youtube.com/playlist?list=PLPNW_gerXa4OGNy1yE-W9IX-tPu-tJa7S *Timestamps* 00:00:00 Huberman Lab Essentials; Hormones, Sexual Development 00:01:25 Chromosomal Sex, Gonadal Sex, Hormonal Sex, Morphology 00:06:06 Steroid Hormones, Sexual Characteristics 00:09:10 Primary & Secondary Sexual Characteristics, Dihydrotestosterone (DHT), Kisspeptin 00:13:23 Masculinization of Brain, Estrogen 00:14:41 Herbicides, Atrazine, Hormone Effects, Sperm Counts 00:20:29 Female Sexual Development, Androgen Insensitivity Syndrome 00:24:03 Cannabis & Aromatase Activity, Gynecomastia; Alcohol & Estrogen Activity 00:27:00 Cell Phones & Gonads 00:29:46 Beard & Hair Growth, DHT 00:33:04 Hyenas, Hormones, Androstenedione; Plants 00:38:06 Recap & Key Takeaways Disclaimer & Disclosures: https://www.hubermanlab.com/disclaimer