
Berthoud Functional Medicine
Rodney Diffendaffer, R.Ph.
berthoudfunctionalmedicine@gmail.com
Rodney Diffendaffer, RPh, SAFMCP, is a clinical pharmacist and functional medicine specialist with more than 30 years of experience bridging traditional pharmacy with a holistic, root-cause approach to wellness. A fourth-generation Colorado native, Rodney helps clients understand the interconnectedness of their health through personalized insights into nutrition, hormones, lifestyle, and overall well-being.
OUR CORE SERVICES
athletic performance and recovery
Enhance your athletic potential with targeted strategies to boost endurance, peak performance, and metabolic efficiency while speeding up your post-workout recovery.
healthspan
and
lifespan
Our goal is to support both by helping you build a foundation for lasting energy, resilience, vitality, and well-being throughout every stage of life.
Specialized Testing
The Science of Root-Cause Healing
Berthoud Functional Medicine LLC provides personalized wellness consulting focused on root-cause optimization. By analyzing your history and lab data, we address hormone balance, gut health, and longevity. We empower you through evidence-based education and expert testing guidance. Note: We do not diagnose or prescribe; please consult a licensed physician for medical treatments.

our process
1. Introductory Call
Every client relationship begins with a brief phone conversation, usually about 15 minutes. This is a chance for us to get to know you, hear about the health concerns you'd like to explore, and answer any questions about how we work.
2. Health History and Intake
After your call, we'll email you our intake forms, including a confidential health history questionnaire. We'll also ask for any previous and recent lab results you have, so we can see the full picture of your health over time.
3. Lab Testing
If you don't have recent labs, we'll recommend a lab panel based on your health goals and concerns. Our panels are often more comprehensive than standard testing, because we look at related nutrients and markers that can offer additional insight. For example, when thyroid health is a concern, a panel may include TSH, free T3, free T4, TPO and thyroglobulin antibodies, and reverse T3, along with nutrients such as vitamin D and markers related to stress, like cortisol.
4. Lab Review Session
Once your results are in, we'll meet in person or by telehealth to go over them together. We'll walk you through what each marker measures and how the results may relate to one another, so you understand your own numbers and can be an active part of the process.
5. Your Personalized Wellness Plan
After your review session, we'll create an action plan tailored to your goals, which may include nutrition, exercise, and supplement recommendations.
6. Prescription Services Through Licensed Nurse Practitioners
If prescription medication may be appropriate, we can connect you with a licensed nurse practitioner who works with our practice. All prescribing decisions are made by the nurse practitioner. Medications can be filled through specialized compounding pharmacies and shipped directly to your home, often at a lower cost than a retail pharmacy. If you prefer a commercially manufactured medication filled at your local pharmacy and billed to your insurance, that option is available as well.
7. Ongoing Support and Follow-Up
When prescriptions are part of your plan, including hormones, thyroid support, peptides, and other programs, your nurse practitioner will schedule a three-month follow-up with updated labs, and any medication adjustments will be made by your nurse practitioner at that time. We also check in monthly with a quick 15-minute call or secure message to see how you're doing. After the first three months, we stay in touch throughout the rest of your year, and labs are updated annually to keep your plan current.
Pricing
We are a cash-pay practice and do not accept insurance. Consultations are $200 per hour, billed in 15-minute increments. Lab testing is also cash pay. If your plan includes prescription services, there is an annual nurse practitioner fee of $300, renewed each year with your annual labs.
Monthly Membership
For clients who want ongoing support, our membership is $79 per month and includes a 30-minute meeting each month to review your progress, discuss anything you'd like to add to your plan, and update your nutrition and exercise goals.
Professional-Grade Supplements
We recommend NutriDyn supplements, which are professional-grade, third-party tested, and competitively priced. We'll send you a personalized supplement form, and you can order directly from NutriDyn and reorder anytime, with delivery right to your door.
Disclaimer:
Berthoud Functional Medicine LLC does not diagnose or treat any disease or medical condition. When prescription medications are appropriate, they are prescribed and managed solely by independent licensed nurse practitioners.
services FOR PROVIDERS
01
Global Test Result Interpretation
Deep-dive clinical support for providers managing complex patient cases. I provide methodical analysis of functional lab results including hormone panels and gut health tests, identifying root causes that traditional metrics might overlook. Together, we develop strategic treatment pathways incorporating both natural supplements and synthetic medication options.
02
Evidence-Based Recommendations
Leveraging specialized expertise in hormone regulation and wellness strategies to provide actionable guidance for your practice. My recommendations prioritize patient safety and efficacy, blending natural interventions with precise medication adjustments to ensure comprehensive recovery and long-term health optimization.
Begin the path to root-cause healing
Specializing in comprehensive hormone regulation, gut health strategies, and expert consultative testing analysis for individuals and healthcare providers alike.
Berthoud Functional Medicine LLC
Nationwide Consulting for Medical Providers