Meet Our Doctors
Compassionate Experts Dedicated to Your Wellness Journey
Dr. Tonya Fleck, ND
Founder and Medical Director
“It is much easier to prevent a disease than it is to try to reverse it.”
Dr. Fleck founded the Santa Cruz Naturopathic Medical Center in 2009 with a vision to bring truly personalized, integrative healthcare to the Santa Cruz community. With over 20 years of clinical experience, she has become a trusted leader in naturopathic medicine, helping thousands of patients discover their path to optimal wellness.
Education & Training:
- Doctor of Naturopathic Medicine, Southwest College of Naturopathic Medicine
- Bachelor of Science in Psychology, Buffalo State University
- Graduate work in Marriage and Family Therapy
- Specialized training in Bio-Identical Hormone Replacement Therapy
Clinical Specialties:
- Thyroid Optimization
- Hormone Optimization & Bio-Identical Hormones
- Testosterone Replacement Therapy
- Adrenal Fatigue
- Functional Medicine & Root Cause Analysis
- Preventive Medicine & Wellness Optimization
- Autoimmune Conditions
- Depression & Anxiety
Dr. Fleck’s Approach: Dr. Fleck believes in the power of partnership between doctor and patient. She takes time to truly understand each person’s unique health story, combining advanced diagnostic testing with evidence-based natural therapies. Her patients appreciate her thorough, compassionate approach and her ability to explain complex health concepts in understandable terms.
What Patients Say: “Dr. Fleck saved my life. She found the root cause of my chronic fatigue when no other doctor could, and her treatment plan gave me my energy and joy back.” — Sarah M.
Dr. Tristin Wallace, ND
Naturopathic Doctor
Dr. Tristin Wallace is a licensed naturopathic doctor practicing integrative and precision medicine for over 20 years. She offers clinical depth, bridging classical naturopathic philosophy with cutting-edge molecular medicine, to bring patients a comprehensive and individualized model of care.
A Broad Naturopathic Toolkit
Dr. Wallace’s toolkit contains naturopathic talents from bodywork to botanicals, homeopathy to high dose vitamin C, and includes healing approaches to help with sleep, energy, weight management, digestion, and reproductive health. Her passion projects and further specializations are in integrative oncology and complex infectious disease.
Integrative Oncology Support
In her oncology support practice, Dr. Wallace addresses a comprehensive biological architecture of the individual’s unique cancer, incorporating RGCC tumor profiling, ctDNA liquid biopsy monitoring, and genomic analysis. She uses targeted, individually designed botanical and nutraceutical protocols as a foundation, and molecular biomedicine as a defense against cancer progression. Dr. Wallace has served patients facing various malignant conditions including myeloma, lymphoma, glioblastoma, colorectal, breast, uterine, and more. She supports conventional management using thoughtful, multi-layered protocols addressing the tumor microenvironment, immune co-signaling burden, and systemic inflammatory drivers while strengthening the patient’s overall health.
Lyme Disease & Complex Infectious Disease
Dr. Wallace has worked closely with Lyme disease and chronic Lyme-like conditions including MCAS and CIRS since 2011. Her successful approach recognizes multi-species Borrelia complex and the many coinfections of Lyme, such as EBV reactivation, with an eye on her patients’ internal and external environments. She judiciously applies oligonucleotide therapy, safe ozone therapy, and photobiomodulation alongside antimicrobial botanicals grounded in time honored use and published clinical evidence.
Care with Warmth, Precision & Professional Leadership
Dr. Wallace is distinguished by her capacity to meet her patients’ clinical goals with warmth and precision, respecting each patient’s intelligence and autonomy. Prior to joining the inspiring team of healers at Santa Cruz Naturopathic Medical Center, Dr. Wallace served as senior naturopathic consult to Dr. Ahvie Hersokowitz, president of the American College for Advancement in Medicine, in San Francisco. She remains an active participant in naturopathic postgraduate service through her elected position with the Utah Naturopathic Association.
Dr. Kaila Sellars, ND
Naturopathic Doctor
Specializing in Integrative Oncology, Men’s Health and PRP
Dr. Sellars believes in using the best of modern medicine combined with holistic, natural therapies to help you achieve full health and vitality. She will tailor a treatment plan that meets you where you are at in your health journey and encourages you to continuously pursue your best self.
Education & Training:
- Doctor of Naturopathic Medicine, National University of Health Sciences
- Bachelor of Science in Biomedical Science
- Residency in Integrative Oncology
- Additional Certification in Platelet Rich Plasma Injections
- Specialized training in Intravenous Nutrient Therapies
Clinical Specialties:
- Cardiovascular health, with comprehensive labs to fully evaluate heart health and inflammation*Gut health, with comprehensive labs including food sensitivities and microbiome testing
- Hormones, including adrenal, thyroid, pre-menstrual, PCOS, and menopause
- Chronic infections and fatigue
- Integrative cancer treatments
- Longevity and wellness, utilizing your unique genetics with 3×4 genetic testing
- Platelet Rich Plasma (PRP), joint and ligament injections, rejuvenation (“O” shot) injections, & microneedling
Dr. Sellars’ Approach: Dr. Sellars believes that healing happens when patients feel truly heard and understood. She combines detailed detective work to uncover root causes with compassionate support throughout the healing process. Her treatment plans are always realistic, sustainable, and tailored to each patient’s unique needs and lifestyle.
Outside of work, you will find Dr. Sellars on the beach with her husky Kylo, playing pickleball or rowing with the Santa Cruz Rowing Club.
What Patients Say: “Dr. Sellars finally figured out my digestive issues after 10 years of suffering. Her gentle approach and practical solutions changed my life.” — Michael T.
Real stories from real people who've transformed their health at SCNMC
What Our Patients Are Saying
Our Dedicated Support Staff
The Heart of Our Practice
Behind every great medical practice is an exceptional support team. Our staff members are the first friendly faces you’ll see and the caring voices you’ll hear when you call. They’re trained not just in administrative excellence, but in creating a warm, healing environment where every patient feels valued and cared for.
Our Front Desk Team: Our patient care coordinators handle scheduling, insurance questions, and ensuring your visit runs smoothly from start to finish. They’re knowledgeable about our services and passionate about helping you navigate your healthcare journey with ease.
Our Clinical Support Team: Our medical assistants work closely with our doctors to ensure you receive comprehensive care. From preparing treatment rooms to assisting with procedures like IV therapy and B12 injections, they’re trained in the highest standards of clinical excellence and patient care.
Our Administrative Team: Behind the scenes, our administrative staff ensures that everything runs seamlessly—from insurance processing to maintaining your health records securely and efficiently.
What Makes Our Staff Special:
Genuine Care: Every team member is genuinely invested in your health and wellbeing
Extensive Training: All staff receive ongoing education in naturopathic principles and patient care
Personal Attention: We remember your name, your health goals, and your preferences
Professional Excellence: Committed to the highest standards of medical office management
Collaborative Spirit: We work as a unified team to support your wellness journey
Finding us is easy – healing shouldn't be complicated.
Conveniently Located in the Heart of Santa Cruz
Visiting us is easy. Healing shouldn’t be complicated. Conveniently located in the heart of Santa Cruz with ample parking.