Dr. Izabella Wentz is an internationally acclaimed thyroid specialist and solution-focused integrative pharmacist, who has dedicated her career to addressing the root causes of autoimmune thyroid disease after being diagnosed with Hashimoto’s Thyroiditis in 2009, following a decade of debilitating symptoms.

Dr. Wentz has written several best-selling books, including the New York Times best seller Hashimoto’s Thyroiditis: Lifestyle Interventions for Finding and Treating the Root Cause, the protocol-based #1 New York Times best seller Hashimoto’s Protocol: A 90-Day Plan for Reversing Thyroid Symptoms and Getting Your Life Back, and the Wall Street Journal best seller Hashimoto’s Food Pharmacology: Nutrition Protocols and Healing Recipes to Take Charge of Your Thyroid Health.

Her last book, Adrenal Transformation Protocol, focuses on resetting the body’s stress response through targeted safety signals. It is based on her successful 4-week program which has helped over 3,500 people reduce symptoms like brain fog, fatigue, anxiety, sleep issues, and libido.

Her upcoming book, IBS: Finding and Treating the Root Cause of Irritable Bowel Syndrome, releases March 17, 2026. While IBS is often treated as a standalone diagnosis, an IBS diagnosis is often a sign of deeper, unaddressed imbalances for those with autoimmune conditions like Hashimoto’s. Drawing on professional insight, current research, and real-world strategies, IBS: Finding and Treating the Root Cause of Irritable Bowel Syndrome outlines clear, practical steps to help readers identify the drivers of gut dysfunction, follow gentle healing protocols, and finally feel better from the inside out.