Did you know that hormones play a pivotal role in directing the course of your health throughout your lifetime? From physical growth and development to emotional well-being and reproductive health, these chemical messengers are vital for our overall well-being. Understanding how hormones function and seeking appropriate medical guidance can help us navigate through the various stages of life while maintaining hormonal balance.   Dr. Felice Gersh joins me as we take a closer look at the different types of estrogens, their individual impacts on the body, and the importance of understanding their nuances for overall health. We also discuss how reproduction is the prime directive of life and how hormones act as 'hormonal glue' to enable reproductive success. Plus, we dive into some of the benefits and complexities of Hormone Replacement Therapy (HRT), including when to start and the potential risks associated with it.   Dr. Felice Gersh is board-certified in both OB/GYN and Integrative Medicine. She is the founder and Medical Director of the Integrative Medical Group of Irvine. Always passionate about learning and education, she taught obstetrics and gynecology at Keck USC School of Medicine for 12 years as an Assistant Clinical Professor. Dr. Gersh now serves as an Affiliate Faculty Member at the Fellowship in Integrative Medicine, through the University of Arizona School of Medicine, where she lectures and regularly grades the case presentations written by the Fellowship students for their final exams. Dr. Gersh is a globally recognized expert on a wide range of female and integrative health topics.      Thank you to our sponsors for making this episode possible: Restoracell: Use code NAT25 at https://www.vitaliskincare.com/ Troscriptions: Use code NAT10 at https://troscriptions.com/ LVLUP: Use code NAT10 to save 10% off at https://lvluphealth.com/ Find more from Nathalie: YouTube: https://www.youtube.com/channel/UCmholC48MqRC50UffIZOMOQ Facebook Group: https://www.facebook.com/groups/biohackingsuperhumanperformance Instagram: https://www.instagram.com/nathalieniddam/ Website: NatNiddam.com Join Nat’s Membership Community: https://www.natniddam.com/bsp-community Work with Nat: Book Your 20 Minute Optimization Consult: https://calendly.com/nniddam/intro-call?month=2021-08   Find more from Dr. Felice Gersh: Website: https://integrativemgi.com/ Instagram: @dr.felicegersh    What we discuss: (0:00:03) - The importance of women's hormones (0:16:18) - Understanding the different types of estrogens (0:20:05) - The effects of hormone therapy (0:27:25) - Exploring hormone replacement and natural alternatives (0:34:47) - The benefits of cyclical hormone therapy (0:45:23) - Benefits of vaginal estrogen and hormone replacement therapy (0:53:58) - The complexities of hormone replacement therapy (1:06:24) - Testing hormones for women   Key Takeaways: Osteoporosis is a condition where bone loss occurs gradually over time. However, in the first few years after menopause, there is a significant acceleration of bone loss. If individuals have not proactively taken measures to mitigate this rapid loss, their condition could worsen. This pattern can be applied to other organ systems as well, where starting the menopausal transition in a good state overall leads to better outcomes. It is essential to understand that the testosterone produced by the ovaries plays a crucial role in promoting overall health and well-being in women. The ovaries have the ability to produce testosterone indefinitely in a different part of the ovary, even after the eggs are depleted. This explains why removing the ovaries, even in post-menopausal years when they are no longer producing estrogen or progesterone, can negatively impact a woman's health and increase mortality.  The prime directive of life is reproduction, and humans are the only species on the planet that actively work towards controlling their reproductive fate. Unlike animals in the wild, humans have