Estradiol - Wikipedia
The ratio of estrogen and testosterone determine their effects. They are mainly produced in the ovaries or testicles (and adrenals for testosterone).
Andrew Huberman • The Science of How to Optimize Testosterone & Estrogen
Determine How Long & Well You Live by Dr. Becca Levy, www.becca-levy.com Hormone Intelligence: The Complete Guide to Calming Hormone Chaos and Restoring Your Body’s Natural Blueprint for Well-Being by Dr. Aviva Romm, www.avivaromm.com
Liz Moody • 100 Ways to Change Your Life: The Science of Leveling Up Health, Happiness, Relationships & Success
not correct to call estrogen then a “sex hormone,” but a stress hormone, and its greater proportion in body of female is because female is under greater stress due to demands of inner cell division and menstruation.