Dr. Kathryn Retzler & Daniel Soule
HormoneSynergy® was built around a clear mission: to help people pursue vibrant health, stronger brain function, healthier aging, and greater longevity through a more personalized, evidence-based, physician-guided approach.
At the center of that mission are Dr. Kathryn Retzler and Daniel Soule, whose combined backgrounds in medicine, preventive cardiology, hormones, behavior change, education, coaching, and patient-centered support help shape the HormoneSynergy® model.
Together, they have built a clinic philosophy grounded in prevention, clarity, personalization, and the belief that aging does not need to mean declining on schedule.
Our philosophy:
HormoneSynergy® combines physician-guided medicine, prevention, advanced diagnostics, behavior change, education, and long-term strategy to help patients move beyond symptom management alone and toward healthier aging and better function.
Dr. Kathryn Retzler
Dr. Kathryn Retzler is the founder of HormoneSynergy® and a physician focused on longevity medicine, preventive cardiology, hormone optimization, brain health, and personalized healthy aging.
Her purpose is to inspire as many people as possible to pursue vibrant health, healthy aging, and longer life while helping prevent premature decline whenever possible. She believes every person has a unique path to better health, and that optimal aging and healthy brain function are goals worth actively pursuing.
Dr. Retzler rejects the idea that aging must automatically mean falling apart on schedule. She brings that same high standard for physical, mental, and long-term health to her patients through a prevention-first clinical model.
Her work combines medical knowledge, authentic leadership, ongoing education, and individualized treatment strategies designed to help people improve how they feel, function, think, and age.
Training & Background
Dr. Retzler received her doctorate from the National College of Naturopathic Medicine in Portland, Oregon in 2001. After completing an internship in integrative medicine with Andrew Weil, MD, followed by a residency in McMinnville, Oregon, she focused her career on building bridges between conventional medicine and more personalized, integrative approaches to prevention and healthy aging.
She founded HormoneSynergy® Clinic to help people pursue vibrant health, ideal brain function, hormone balance, and longevity. Her clinical model integrates evidence-based natural therapies, lifestyle interventions, pharmaceutical therapies when appropriate, and bioidentical hormones as part of a broader plan to address underlying causes and restore health and vitality.
Dr. Retzler completed two fellowships in preventive cardiology through the American Academy of Anti-Aging Medicine with Mark Houston, MD. She regularly attends, teaches, and lectures at age management, hormone, brain health, and longevity-focused conferences and seminars.
Mentors and influences acknowledged in her background include Rebecca Glaser, MD, Thierry Hertoghe, MD, Daniel Amen, MD, and Dale Bredesen, MD.
She is currently licensed with full prescribing authority in the states of Oregon and Washington and is available as a consultant to patients seeking personalized health optimization and longevity support, as well as to medical professionals seeking training in age management medicine, preventive cardiology, and bioidentical hormone therapy for both women and men.
What people are saying about Dr. Retzler
Clinical Focus Areas
- Preventive cardiology and cardiometabolic health
- Bioidentical hormone therapy for women and men
- Brain health and cognitive resilience
- Healthy aging and longevity medicine
- Personalized prevention and advanced diagnostics
Daniel Soule
Daniel Soule serves as Sole Owner of HormoneSynergy Inc. and Manager of HormoneSynergy Clinic LLC. He brings a background in psychology, counseling, coaching, spiritual care, and behavior change to the HormoneSynergy® mission.
Daniel’s work has long centered on helping people change the story they are living. His perspective is grounded in the belief that growth begins when people recognize they are the authors of their own lives, and that meaningful change becomes possible when they take ownership of that story.
As a counselor and certified spiritual and life coach, he is deeply committed to motivating, encouraging, and supporting people as they work toward healthier lives. Within HormoneSynergy®, his role bridges operational leadership, patient-centered communication, education, and the practical side of helping people move from where they are to where they want to be.
In addition to his work with the clinic, Daniel enjoys time with family, regular exercise, biking, movies, and coastal getaways. Together with Dr. Retzler, he is committed to helping people pursue positive change through education, support, and practical next steps.
Education & Training
Daniel received his degree from Wichita State University and attended New West Seminary in Portland, Oregon. He completed ICF coaching certification training through New Vibe Training Center and earned certification in advanced clinical hypnotherapy and neuro-linguistic programming through Apositiva Counseling and Training Center.
Education
- Wichita State University — Psychology, Sociology, and Anthropology
- New West Seminary — Interfaith Studies
Continuing Education
- New Vibe Training Center — ICF Coaching Certification
- Apositiva Counseling and Training Center — Advanced Clinical Hypnotherapy and Neuro-Linguistic Programming
- AMPAC University — Certification in Clinical Hypnotherapy
- Kansas College of Chinese Medicine
- Total Health Works School of Massage
- Your New Life Story® — Health and Wellness Coaching Certification
The HormoneSynergy® Mission
HormoneSynergy® exists to help patients pursue better energy, better function, stronger cognition, healthier body composition, improved cardiometabolic health, and a more proactive path to longevity. The model is designed to go beyond symptom suppression and instead address the larger systems influencing health over time.
This may include preventive cardiology, hormone optimization, brain health assessment, metabolic evaluation, body composition analysis, personalized lifestyle strategy, and physician-guided interpretation of advanced diagnostic data.
We believe medicine should be both personalized and evidence-based, with a strong emphasis on prevention, education, and long-term outcomes.
Why Patients Choose HormoneSynergy®
- Physician-led longevity medicine with a prevention-first philosophy
- Integrated care across hormones, cardiometabolic health, brain health, and healthy aging
- Advanced diagnostics that help create a clearer baseline
- A patient-centered approach that values education and action
- Local care for Portland and Lake Oswego with broader educational reach
Learn More About Our Approach
If you are exploring a more comprehensive, physician-guided path to preventive longevity medicine, these pages can help you better understand the HormoneSynergy® model:
- Personalized Longevity Medicine
- HormoneSynergy® Longevity Medicine Model
- Preventive Cardiology and Cleerly Testing
- Hormone Optimization and Bioidentical Hormone Therapy
- Weight Loss for Longevity
Longevity Medicine Resources
Connect With HormoneSynergy®
If you would like to learn more about our clinic, our philosophy, or our physician-guided approach to healthy aging, we invite you to connect with us.
Frequently Asked Questions
Who is Dr. Kathryn Retzler?
Dr. Kathryn Retzler is the founder of HormoneSynergy® and a physician focused on preventive cardiology, hormone optimization, brain health, and evidence-based preventive longevity medicine.
Who is Daniel Soule?
Daniel Soule is the sole owner of HormoneSynergy Inc. and manager of HormoneSynergy Clinic LLC. He brings a background in psychology, counseling, coaching, behavior change, and clinic leadership to the HormoneSynergy® mission.
What is HormoneSynergy®?
HormoneSynergy® is a physician-led longevity medicine clinic serving Portland and Lake Oswego with a focus on prevention, hormones, cardiometabolic health, brain health, diagnostics, and healthy aging.
What does HormoneSynergy® focus on?
HormoneSynergy® focuses on preventive cardiology, hormone health, brain health, metabolic wellness, body composition, healthy aging, and personalized longevity medicine.
Does HormoneSynergy® only serve Oregon patients?
HormoneSynergy® provides local clinical care in Portland and Lake Oswego, Oregon, while also offering broader education and supplement resources for individuals seeking a more evidence-based longevity medicine model.
HormoneSynergy® Longevity Medicine • Portland & Lake Oswego • Preventive Longevity Medicine • Hormones • Brain Health • Preventive Cardiology