Medical Advisory Board Member:
Cassie Smith MD

Dr. Cassie Smith, MD is a dual board-certified endocrinologist, Founder of Modern Endocrine, and Chief Medical Officer of Renthyroid. She also serves on the medical faculty of Evexias Medical, a bioidentical hormone company. Dr. Smith is known for helping patients uncover why they still feel unwell despite “normal” lab results by using a holistic, root-cause approach to gut, metabolic, thyroid, and hormonal health.

After completing her fellowship at the Harold Hamm Diabetes Center and being named a Top Doctor by 405 Magazine, Dr. Smith grew frustrated with the limitations of conventional care and built a model focused on treating the whole person—not just symptoms. She is the author of Fix Your Gut, Fix Your Hormones: The Critical Connection Your Doctor Is Missing… and Why You Still Feel Bad Despite Normal Labs, and through her popular podcast, Hormones, Metabolism, and You, she translates complex endocrinology into practical, actionable guidance.

Today, Dr. Smith and her team help thousands of patients each year get to the root cause of gut health issues, hormone imbalances, thyroid disease, and weight resistance. She is licensed to provide telehealth and in-clinic care across 46 states, based in Oklahoma.