Dr. Cynthia Castillo, ND, MSAOM, FABNO

Dr. Castillo is a licensed naturopathic doctor and researcher. She is passionate about empowering patients through knowledge, helping them make educated decisions about their health care, with the goal of optimizing their well-being.

Dr. Castillo developed a keen interest in cancer care after close family members and friends received a diagnosis of Breast Cancer. She obtained her specialty in Naturopathic Oncology after completing a two-year residency at Cancer Treatment Centers of America® (CTCA) in Philadelphia, PA, where she also served as a Staff Naturopathic Doctor. During her almost five years at CTCA, Dr. Castillo provided integrative Naturopathic Medicine support to patients with early- and advanced-stage cancers, including solid tumors and blood cancers. She also cared for and participated in the development of integrative treatment protocols for patients undergoing stem cell transplantation.

She believes that complex disorders such as cancer and chronic diseases are best addressed utilizing novel therapeutic approaches that recognize the interconnectedness among genetic makeup, biochemistry, physiology, psycho-emotional-spiritual states, as well as environmental exposures and lifestyle patterns, that converge to create a state of imbalance or one conductive to health. Dr. Castillo believes in holistic approaches incorporating innovative therapeutic modalities, naturopathic and conventional, collaborating with patients and multidisciplinary medical professionals to develop comprehensive clinical treatment options that are transformative and effective.

Prior to pursuing a Naturopathic Medicine degree, Dr. Castillo earned a Bachelor of Science in Microbiology and a Master of Science in Biology from the University of Texas at El Paso (UTEP). She has conducted basic science research in microbiology and molecular biology at UTEP, Tufts University, and the National Institutes of Health, and has co-authored several articles published in scientific journals.

With her background in molecular biology, Naturopathic medicine and Traditional Chinese medicine, Dr. Castillo utilizes the wisdom of nature with modern scientifically supported treatment methods to make safe, innovative, and personalized recommendations to help patients achieve their health goals, maintain their quality of life, cultivate hope and a state of vitality during and after cancer treatment.

Dr. Castillo is a certified Fellow of the American Board of Naturopathic Oncology (FABNO); a member of the American Association of Naturopathic Physicians (AANP) and the Oncology Association of Naturopathic Physicians (OncANP).

When she is not tending to her patients, Dr. Castillo enjoys spending time with her husband exploring the outdoors hiking, biking, kayaking, or simply enjoying a relaxing walk in nature.


  • Naturopathic Oncology
  • Auto-immune Conditions
  • Endocrine Disorders and Hormonal Imbalances
  • Digestive Disorders and Food Sensitivity Testing
  • IV Therapy and Injection Therapy


Dr. Castillo received her Doctorate of Naturopathic Medicine and a Masters of Acupuncture and Oriental Medicine from Bastyr University in Seattle, WA, followed by and an intensive immersion program in Traditional Chinese Medicine and Acupuncture in Chengdu and Shanghai, China.

She then completed a one-year residency in Primary Care at Emerald City Clinic in Seattle, WA, where she provided primary health care services to children and adults specializing in gastrointestinal health, women’s health, auto-immune conditions, hormonal imbalances, and supportive cancer care.