John J. Herbert, DC is a retired chiropractor, educator, and health researcher with more than four decades of experience studying the underlying causes of chronic fatigue, dysautonomia, and stress-related disorders. A graduate of Palmer College of Chiropractic (Class of 1980), Dr. Herbert spent years studying patients whose symptoms did not fit neatly into conventional diagnostic categories.

Throughout his career, Dr. Herbert observed a recurring pattern among patients suffering from persistent fatigue, brain fog, exercise intolerance, anxiety, and autonomic dysfunction—many of whom were told their labs were “normal” despite clear functional impairment. This long-standing clinical paradox became the foundation for his research into subclinical adrenal insufficiency and its relationship to modern fatigue syndromes.

Now retired from active practice, Dr. Herbert focuses on education and writing, translating complex physiology into clear, patient-centered explanations. His work bridges the gap between traditional endocrinology, functional medicine, and real-world clinical observation, offering a fresh perspective for patients, clinicians, and researchers alike.