Functional Lab Training & Holistic Health Practitioner Program
Stop Guessing, Start Getting Results
The only functional lab methodology proven effective over 17 years of clinical practice
Join 5,000+ practitioners who’ve escaped the trial-and-error cycle to build thriving 6 and 7-figure practices using systematic FDN Methodology
5,000+
Certified Practitioners
50+
Countries
17+
Years Proven
From Dr. Will Cole's Keynote at FDN Holistic Health Week 2026
“I work with almost exclusively FDNs. They’re the best people to work with.”
Dr. Will Cole
Dr. Cole has sent "countless" patients to FDN for certification training.
Read the full interviewNew to FDN?
What is Functional Diagnostic Nutrition?
A non-diagnostic methodology for finding dysfunction in the body, and the training that teaches practitioners how to run the labs that reveal it and what to do with what they find.
HIDDEN. Six body systems examined together, because dysfunction in one shows up in the others.
DRESS. A repeatable protocol framework built from what each client's own labs show.
Lab access. Order from 70+ functional labs without holding a medical license.
Join us for live workshops and trainings that will introduce you to the FDN approach to functional health.
The Reality Check Every Health Practitioner Faces
Even with the best intentions, most practitioners remain stuck in the same cycle their clients experience…
The Symptom-Chasing Game
Running labs based on symptoms (“sounds like thyroid”) creates an endless cycle of test-treat-test-treat without addressing enough underlying causes to completely resolve the problem. You’re playing medical detective without using the most comprehensive investigation
Inconsistent Client Outcomes
Generic protocols work for some clients but fail others, leaving you and your client questioning your expertise. Without a systematic approach, you’re essentially experimenting on every client.
Practitioner Burnout
Generating protocols for every case is exhausting and unsustainable. You need a repeatable system that consistently delivers positive results so you can focus on living a more balanced life.
The Clinical Discovery That Changed Everything
After watching countless clients cycle through 4, 5, 6+ practitioners with no lasting results, Reed Davis made a commitment: “I will be the last practitioner they ever need to see.”
Through 10 years of clinical practice, reviewing thousands of labs for thousands of people, and meticulous observation of patient outcomes, Reed discovered the missing piece in functional health.
10,000+
Labs Analyzed
10
Years Clinical Development
1
Proven System
“The breakthrough wasn’t finding THE root cause – it was systematically identifying MULTIPLE healing opportunities and applying health building principles to every cell, tissue and organ – simultaneously.”
The FDN Difference
Why Our Graduates Become The Last Practitioner
Complete Picture Analysis
Our H.I.D.D.E.N system reveals dysfunction across hormone, immune, digestion, detoxification, energy production, and nervous systems. No more guessing which tests to order – you get the complete metabolic picture every time.
Crime Scene Investigation Approach
Like a detective collecting ALL available evidence before drawing conclusions, we gather comprehensive data to identify multiple healing opportunities simultaneously, not just isolated symptoms.
Systematic Methodology
Whether it’s autoimmune conditions, gut issues, or hormonal imbalances – the FDN Methodology works because we address metabolic dysfunction at multiple sources, not just downstream effects.
Lab Access Without Medical Background
Our Medical Director Program provides you access to 70+ functional labs, transforming your practice capabilities immediately – no license required.
The H.I.D.D.E.N System
Our proven 5-lab framework reveals the complete picture of metabolic dysfunction.
Instead of chasing symptoms, we systematically evaluate major body systems using the FDN Methodology to identify where dysfunction creates downstream effects throughout the body.
Hormone
Labs: Fluids iQ Stress & Hormone Panel
Lab reveals circadian rhythm and adrenal dysfunction along with catabolic dominance and the downward spiral that generates sex hormone imbalances and other common symptoms.
Includes: 4X cortisol, estrogen, progesterone, testosterone, melatonin, SigA, (optional insulin).
Immune
Labs: Stress and Hormones Profile, Fluids iQ Mucosal Barrier Assessment, Leap MRT, GI-MAP Stool test & more
Identifies over and under active immune system, dysbiosis, inflammation, hyperpermeability, oxidative stress, liver congestion and other healing opportunities.
Includes: Zonulin, Histamine, DAO, Indican, 8-0HdG, Urinary Bile Acids & more.
Digestion
Labs: Fluids iQ Metabolic Wellness Panel, Fluids iQ Mucosal Barrier Assessment and GI-MAP Stool test
Uncovers maldigestion & malabsorption, compromised detoxification, leaky gut, bacterial overgrowth (h.Pylori etc), parasitic infections, yeast overgrowth, viral load, pancreatic enzymes & other helpful markers.
Includes: Multiple functional, microbiome and pathogen assessments
Detoxification
Labs: Fluids iQ Metabolic Wellness Profile, GI-MAP Stool Screening
Direct measurement of liver function, protein breakdown & synthesis and a complete gut microbiome and detoxification pathway assessment.
Energy Production
Labs: Metabolic Typing® Assessment, Oxford Mediator Release Test (MRT)
Reveals your unique blueprint for unlocking energy from food including protein, fat and carb metabolism. Leads to maximum energy production and efficiency in every cell, tissue and organ.
Includes: Oxidative rate and autonomic nervous system balance.
Nervous System Balance
Labs: Metabolic Typing® Assessment, Oxford Mediator Release Test
Reveals your body’s innate preference for regulating & distributing energy and balancing the sympathetic and parasympathetic nervous systems.
Includes: Oxidative rate and autonomic nervous system balance.
The D.R.E.S.S. for Health Success® Protocol
Once H.I.D.D.E.N healing opportunities are identified, applying the health building principles inherent in the D.R.E.S.S. for Health Success program produces the results you and your clients are looking for.
This signature framework transforms lab data into personalized protocols that reliably and repeatedly produce successful outcomes, regardless of your client’s health challenges.
“The FDN System consistently outperforms any other programs we are aware of.” – Reed Davis
Learn More About Our DRESS MethodologyD - Diet
There is no one diet that is right for everyone. A personalized nutritional foundation based on lab findings & other data – not generic advice but bio-individual recommendations addressing individual genetic requirements.
R - Rest
Not just sleep optimization but a holistic approach to total recovery strategies tailored to individual circadian rhythm and cortisol patterns and balances the hormone and autonomic nervous systems.
E - Exercise
Exercise programs are designed to meet the needs of each client based on their current health status, age and conditioning, then revised & updated as conditioning improves, often leading to surprisingly superior results, even surpassing clients’ highest expectations.
S - Stress Reduction
Stress in all its forms is complex and multi-faceted but not impossible to sort out, even when it comes to well-hidden and deep-rooted sources. Stressors ranging from physical ailments to mental-emotional and psycho-spirtual distress to environmental and bio-chemical challenges add up over time and have down-stream effects that contribute to Metabolic Chaos®.
Not only does each causal factor have a negative effect, they all affect each other in ways that can’t be singly measured. Our D.R.E.S.S protocol has a positive effect on every cell, tissue, organ and system (the entire organism) simultaneously.
S - Supplementation
Used not to treat the disease but to Substitute for what’s missing in today’s food, Support weak systems, Stimulate areas as needed and Self-treat when all-natural, drug-free protocols are appropriate.
Supplement Recommendations are based on specific deficiencies and dysfunction – guided by lab data and client complaints, not just guesswork.
FDN is a proven step-by-step system that identifies obstacles to healing and helps clients creatively overcome them, eventually unveiling the core dysfunctions and underlying causes.
The Power of Integration D.R.E.S.S. protocols affect every cell, tissue, organ, and system simultaneously. This systematic approach is why our graduates achieve transformative results when others see only marginal improvements.
How It Works:
Become Your Own First Client
Master the FDN Methodology by experiencing it first for yourself – then help others achieve the same results.
You can’t effectively teach what you haven’t personally experienced. Every FDN student optimizes their own health first, gaining invaluable firsthand experience with our systematic approach.
Enroll, Start Learning & Join the Community
Begin by joining the FDN community, welcomed by the founder, immediate access to your lessons and receive your 5 personal functional lab test kits.
Test Yourself First
As you continue your lessons, complete your own H.I.D.D.E.N labs, experience the testing process firsthand, and work with expert mentors to learn what your personal test results mean.
Create Your D.R.E.S.S. Protocol
Working with a mentor, you will build your personalized protocol using your own lab data and experience the methodology firsthand, and track your own healing progress.
Mastery Through Mentorship
Receive 12 one-on-one mentor sessions including: personal health labs & protocols, role-playing and practical exercises, final examinations and post graduate interview with the founder Reed Davis to envision the future & your next steps.
Launch Your Practice
Graduate as a certified Functional Diagnostic Nutrition Practitioner (FDNP) with real-world experience, access to 70+ labs, and the knowledge, skills and confidence to help others achieve their health goals whether building your own practice or as part of a team.
Continuing Education
Master clinical and business skills when you join our alumni program, The Association of Functional Diagnostic Nutrition Professionals (AFDNP). Enjoy many benefits including discounts, peer support groups and FDN Advanced Courses in many niche-specific trainings.
In addition to your FDNP credential you are also eligible to receive the following designation: Holistic Health Practitioners (HHP) via the American Association of Drugless Practitioners (AADP), plus you’ll have the option to pursue board certification with American Association of Natural Wellness Practitioners (AANWP) and American Natural Wellness Coaching Board (AANWC).
Available Internationally
There are successful FDN Graduates in over 50 countries worldwide. You can take the FDN Program so long as you have an Internet connection. Our labs ship globally, mentorship happens online, and our community spans every continent.
Where our Lab Partners Ship to
Who Becomes an FDN Practitioner?
From healthcare professionals to passionate health seekers – if you’re willing to learn, FDN works for you
The Common Thread
Whether you’re a seasoned practitioner or just starting your health journey, every successful FDN graduate shares three qualities: willingness to learn, dedication to helping others, and commitment to doing the work. No prerequisites required – just bring your passion.
Medical Professionals
Doctors, Naturopaths, Nurses expanding their functional health toolkit
Chiropractors
Adding functional health assessments & protocols to complement their practices
Health Coaches & Allied Practitioners
Upgrading from generic advice to evidence-based protocols
Aspiring Health Coaches
Starting your health career with advanced functional skills
Personal Health Seekers
Individuals focused on optimizing their own and their family’s health ~ worth the price of admission
FDN vs. Other Health Certifications
See why thousands of practitioners choose FDN over other programs
The difference isn’t just in what we teach – it’s a proven process that works with every client no matter their complaint. You will graduate with the confidence to practice, get results and join an international alumni on a mission to help people get well and stay well naturally in a successful fee-for-service practice model or join an existing functional health practice.
Other Certifications
- Teach generalized holistic health information, leaving you guessing what’s actually wrong with your clients and not understanding what’s going to help them reach their health goals.
- Teaches how to treat the paper instead of the person, often leads to continued frustration and poor results.
- No proven process to help clients get well, no reliable, repeatable system that can help you help your clients get well naturally.
- Claim to teach “business & marketing”, but fall short on practical strategies necessary to grow your online or brick & mortar business.
- Provide no direct access to functional labs as an unlicensed professional, limiting your ability to run a profitable independent wellness practice or work in an integrative practice.
- Provide minimal (if any) one-on-one mentorship throughout certification and fall short on practical graduate support.
- Don’t include running labs on yourself to optimize your own health, leaving you with less firsthand experience and more imposter syndrome.
- Limited Access to the program materials after completion, leaving you without reference materials or needing to pay additional fees to keep access to what could be outdated learnings.
Functional Diagnostic Nutrition (FDN)
- Teaches functional lab analysis, so you can make evidence-based decisions that consistently get results, even for complex cases. Backed by 10+ years of clinical experience in a wellness center helping thousands of people.
- Provides a proven systematic framework that combines lab-guided decisions and devoted clinical correlation with each client’s main complaints and lifestyle in mind. It’s not about treating the paper.
- Gives you access to 70+ functional lab tests through our Medical Director Program, enabling a highly effective & profitable independent practice.
- Includes 12 individual 1:1 mentorship sessions to optimize your own health, practice what you’ve learned, and get personal support through multiple practical exercises.
- Provides essential business training so you understand how to create high-value packages with your advanced health skills.
- 2 Live weekly group support calls, with founder & education director. All are recorded and available to watch in your student portal.
- Offers top-tier graduate support with a private community of successful health entrepreneurs & practitioners.
- Build a referral-based waiting-list practice, because you can help people get results, they will refer you to their friends, family, co-workers & more.
- Teaches you to optimize your own health first with functional labs (included), giving you extensive firsthand experience. This is worth the price of entry alone.
Researchers and experts all agree that there are exceptional opportunities in the health coaching market, with the industry expected to grow to over $22 Billion by 2030. Research also reveals there is a significant gap in programs that bridge basic coaching and advanced clinical training.
The Bottom Line. Beyond teaching theory, FDN gives you a complete system that works in the real world. FDN teaches you how to help your clients improve health no matter what the condition.
What You Get:
Complete Value Breakdown ($32,982)
Everything you need to master functional health and build a thriving practice or utilize our job board and work in a successful integrative practice.
LEARN MORE ABOUT WHAT'S INCLUDEDThe FDN Program
Master H.I.D.D.E.N lab interpretations & D.R.E.S.S for Health Success Protocols
Permanent Program Access & Ongoing Updates
Ongoing access to evolving curriculum and any program updates
Medical Director Program Access
Order 70+ labs without medical license
Business Development Training
Start, build and scale your practice
12 One-on-One Mentorship Sessions
Private guidance to interpret YOUR own lab results and prepare for real-world practice
Metabolic Typing Test & Consultation
Personalized report & review session
Global Practitioner Community Access
Network with other FDN practitioners worldwide
5 Functional Lab Tests for You
Complete H.I.D.D.E.N panel to optimize your health
Your Investment Today:
From $389/month
36 monthly payments, or $11,497 paid in full. Other payment plans available.
Real Practitioners, Real Results
See why FDN graduates consistently build 6 and 7-figure practices
Ryan Monahan
FDN Practitioner
“The FDN program was really the only program out there that was teaching its practitioners how to interpret functional labs, and I was confident that FDN would provide me with the tools needed to restore my own health, and to make a lasting difference in my work with my own clients.”
Diane Kazer
FDN Practitioner
“I was making $2k per month as a personal nutritionist and trainer. Once I became an FDN that went up to $5k per month. Then $8k per month the following year. Now I have an online health business making over $250k per year. I recommend FDN to anyone who really cares about helping others make a big change and is ready to work to make a difference.”
Deb Pomeroy
FDN Practitioner
“FDN gave me the confidence to implement new teachings in my business immediately, and it has helped me grow personally and professionally in so many ways. As an IIN graduate and health coach I felt I could help more individuals if I could dig deeper, and FDN has given me the tools to do that!”
Free Workshop
See The FDN Methodology In Action
Watch us analyze a real client’s functional labs and create their personalized D.R.E.S.S. protocol live
Real Client Case Study
Follow along as we analyze actual H.I.D.D.E.N lab results from a client with chronic fatigue and digestive issues
Lab Interpretation Secrets
Learn how to read between the lines and identify healing opportunities others miss. Learn how to connect all the dots, not just understanding what each dot means.
D.R.E.S.S. Protocol Creation
Watch us build a personalized protocol step-by-step using the lab data and client intake information from their Metabolic Chaos® Scorecard.
Client Results Reveal
See the amazing transformation this client achieved following their unique D.R.E.S.S for Health Success® Protocol.
Q&A Session
Get your questions answered by FDN experts and see how the methodology applies to you and your clients.
Watch the Lab Workshop Now
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Join 2000+ health practitioners who've attended this workshop
Ready to Become The Last Practitioner Your Clients Ever Need to See?
Join the 5,000+ practitioners who’ve stopped guessing and started getting results
Complete the program in as little as 4 months – 8 months* with our self-paced approach.
*Talk to one of our advisors to discover how long it will take you to complete based on your personal set up.