About Us

The doctors at Walnut Creek Naturopathic are trained in the art and science of natural health care at accredited medical colleges, and licensed by the state Bureau of Naturopathic Medicine. We recognize that the individual — body, mind, spirit — knows its own healing pathways, and we develop therapeutic programs for the individual that are designed to collaborate with natural healing. We are family doctors, trained to see patients of all ages and all conditions, and each of us is also trained and experienced in specialties such as integrative cancer care. We work with you to diagnose the underlying causes of disease, and restore optimal health. We emphasize education, prevention, and holistic treatment. If your condition requires an outside specialist we will refer you to one, and provide supportive care of the whole person while you are being treated by conventional targeted therapies.

Dr. Heather Barrett

Dr. Barrett is a licensed Naturopathic Doctor who has always had a strong desire to be a healer.  With a background in social work, psychology, and competitive sports, she first learned about naturopathic healing while volunteering at an AIDS orphanage in Africa in 2006…

Dr. Cynthia Castillo

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. Corrine Wang

Dr. Wang is a licensed Naturopathic doctor and obtained her doctorate of Naturopathic medicine from Bastyr University, a leading accredited institution internationally recognized as a pioneer in natural medicine. Prior to pursuing her interests in medicine…

Dr. Renee Choi

Dr. Renee Choi is a licensed Naturopathic Doctor (ND) who earned her degree from Bastyr University in Seattle, Washington.  Her clinical specialties include mind-body medicine (biofeedback), diabetes, cardiovascular…

heather-headshot 150Dr. Heather Barrett, ND, FAAO, Owner & Medical Director

Dr. Barrett is a licensed naturopathic doctor who has always had a strong desire to be a healer.  With a background in social work, psychology, and competitive sports, she first learned about naturopathic healing while volunteering at an AIDS orphanage in Africa in 2006.

Dr. Barrett loves to travel! She has lived in four different countries and had visited over thirty countries by the age of 27 before pursuing her degree in naturopathic medicine.

Having suffered from an undiagnosed severe gluten sensitivity until her late-twenties, Dr. Barrett has personal experience with a number of the symptoms that she is now passionate about balancing for her patients.  Having lived with severe digestive complaints,  extreme adrenal fatigue, migraines, anxiety, and depression, as well as femoral acetabular impingement and hip dysplasia that resulted in the replacement of both of her hips, Dr. Barrett has cultivated a deep relationship with the naturopathic principles, genomic therapies, and the injection therapies that assisted in her own personal healing journey. She now finds great motivation and joy in being able to help others navigate their own individual paths toward health.Heather in Africa

Dr. Barrett graduated from The Boucher Institute of Naturopathic Medicine in 2011 and has extensive experience with a variety of specialty treatments including the use of ozone, prolotherapy, prolozone, neural therapy, neuroprolotherapy, and IV therapies. She also had the privilege of receiving formal medical training in oncology by Dr. Neil McKinney, one of the leading naturopathic doctors in naturopathic oncology.  After graduating, she spent her first year working at Ocean Park Natural Therapies, a clinic that specialized in injury management before joining Synergy Natural Medicine Clinic in Monrovia, a very busy practice where she specialized in naturopathic oncology and gained an invaluable amount of experience in integrative cancer support, general practice, and IV therapies and ozone.

In March, 2016,  Dr. Barrett took the next step in pursuing her dream of creating a clinic that specializes in integrative cancer support and general practice by becoming owner and medical director of Walnut Creek Naturopathic.
In April, 2017, Dr. Barrett was selected to serve on the board of directors of the California Naturopathic Doctor’s Association. She is also a regular speaker in the local community and enjoys spending her free time in the gym, dancing, long distance cycling, swimming, and hiking.

Dr. Barrett’s specialties include:

  • Naturopathic Oncology (Including the integrative support of conventional cancer therapy, with a sub-specialty in breast cancer)
  • Naturopathic Endocrinology (Including hypothyroid, Hashimoto’s, adrenal fatigue, and bioidentical hormone replacement therapy)
  • Genomic Medicine (Multiple Certifications in Methylation and Other SNP Support)
  • Women’s Health (Prevention and treatment of female-specific conditions including additional experience with the use of bioidentical hormones through the American Academy for Anti-Aging Medicine (A4M))
  • Digestive Disorders and Food Sensitivities 
  • Autoimmune Disease 
  • Anxiety & Depression
  • IV and Injection Therapy (Dr. Barrett is certified in intravenous and chelation therapy through the International IV Nutritional Therapy for Professionals)(IIVNTP)

Dr. Barrett is a member of the following organizations:

  • Fellow of the American Academy of Ozonetherapy
  • Board Member of the Board of Directors of the California Naturopathic Doctors Association
  • The Oncology Association of Naturopathic Physicians (OncANP). More information about the role of naturopathic medicine in cancer care is available at the American Board of Naturopathic Oncology, www.fabno.org/about.html.

Dr. CynthiaDr. 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 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.

Dr. Castillo 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.

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.
Dr. Castillo’s specialties include:
– Naturopathic Oncology
– Auto-immune Conditions
– Endocrine Disorders and Hormonal Imbalances
– Digestive Disorders and Food Sensitivity Testing
– IV Therapy and Injection Therapy


Corrinne headshotDr. Corrine Wang, ND

Dr. Wang is a licensed Naturopathic doctor. She obtained her doctorate of Naturopathic medicine from Bastyr University, a leading accredited institution internationally recognized as a pioneer in natural medicine.

Prior to pursuing her interests in medicine, Dr. Wang received her bachelor’s degree of science in electrical engineering and computer science at the University of California at Berkeley. She worked in the semiconductor industry in San Jose, California, and in Shanghai, China.

With a penchant for health, psychology, teaching and a desire to work with people more directly, Dr. Wang decided to pursue naturopathic medicine upon returning from China. Dr. Wang is committed to assisting others achieve balance and wellness in their lives and creates individualized treatments to support each person’s unique healing process.

Dr. Wang has special interests in women’s health and hormone balancing and has pursued additional training in bioidentical hormones through the American Academy for Anti-Aging Medicine (A4M). She has also had training in intravenous therapy through the International IV Nutritional Therapy for Professionals (IIVNTP).

Dr. Wang’s specialties include:

  • Menstrual irregularities including PMS, PCOS, and endometriosis
  • Enhancing fertility through natural treatments
  • Support for transitioning through menopause
  • Bio-identical hormone replacement therapy
  • Other endocrine imbalances – hypothyroidism, Hashimoto’s, adrenal fatigue, and weight concerns
  • Food intolerances and digestive disorders

Dr. Wang also enjoys volunteering and working with underserved populations locally and internationally. She received a venture grant at Bastyr with two classmates to travel to and study different systems of medicines in Peru, working mostly with low-income families. Since coming back to California, she has completed a medical brigade to Nicarauga, providing primary care services using natural treatments to a local community on the island of Ometepe. Dr. Wang has also volunteered at Stanford Hospital, providing reiki to patients on the cancer ward as well as to physicians, nurses and other staff at the Stanford Cancer Care Center. We are excited to welcome Dr. Wang to the team of doctors at WCN to allow us to continue to provide outstanding care to our community. Outside of practicing, Dr. Wang enjoys traveling, dancing, backpacking, rock climbing, hiking, snowboarding, painting, and spending time with family and friends. Dr. Wang is a member of the American Association of Naturopathic Physicians (AANP) and California Naturopathic Doctors Association (CNDA).


Renee Choi HeadshotDr. Renee Choi, ND

Dr. Renee Choi is a licensed Naturopathic Doctor (ND) who earned her degree from Bastyr University in Seattle, Washington. Dr. Choi’s clinical specialties include mind-body medicine (biofeedback), diabetes, cardiovascular, and immune health. While the majority of her time at WCNI is spent administering IV therapies, she also holds certifications in craniosacral therapy and kinesiotaping.

After obtaining her undergraduate degree in nutritional sciences from Cornell University, Dr. Choi served as a research fellow at the National Center for Complementary and Alternative Medicine (NCCAM). Her research focused on the safety and efficacy of phytonutrients on prostate cancer – a subject she continued to research while at Bastyr University.

Outside her practice, Dr. Choi enjoys spending her time practicing yoga, cooking and traveling around the world. Dr. Choi is a member of California Naturopathic Doctor’s Association (CNDA) and American Association of Naturopathic Physicians (AANP).

We are pleased to welcome Dr. Choi back from her maternity leave during which time she gave birth to a healthy and beautiful son, Liam.

Contact & Location

Walnut Creek Naturopathic
120 La Casa Via
Suite 104
Walnut Creek, CA. 94598

(925) 939-0300 | Phone
(925) 939-3181 | Fax

Office Hours

9:30am – 5:30pm Monday – Friday

SUPPORT STAFF

Maria headshotMaria Carr, Patient Care Manager
Maria has worked in the medical field since 1995. She became fascinated with naturopathic care and the body’s ability to heal itself. Other interests have lead her to study real estate and small business management. Although born in Japan, Maria grew up in southern California. She is fluent in Spanish and currently lives in the East Bay with her three daughters and Yorkie named Zacque. In her free time Maria enjoys traveling and relaxing.

Annette headshotAnnette J. MacDonald, Office Manager 
Annette is our office manager and is the friendly voice you hear when calling Walnut Creek Naturopathic to schedule your appointments. Although Annette has a varied background, that includes ergonomics, human resources, and business management, her first love has always been holistic medicine. Annette has a Bachelor’s Degree in Health Science and Health Care Administration as well as certifications in Holistic Nutrition and Health Ergonomics. Annette lives in the East Bay with her husband and her “furry” children Lulu and Blu, and enjoys long walks, reading and dining out with her husband.

Zen Frog
Team Mascot Zen Frog has been our team mascot since 2009. It is our hope that he brings a sense of peace and humor to all who enter our space. Feel free to stop in and meet him anytime.