educational
thorough, connected, tied systems/labs together with thorough explanation, Detective Ev always a pleasure
Lori cui
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Functional Diagnostic Nutrition
5.040 reviews
Last reviewed: Jan 21, 2026Do you agree with Functional Diagnostic Nutrition's TrustScore? Voice your opinion today and hear what 40 customers have already said.
functionaldiagnosticnutrition.comMember since Mar 2026
Functional Diagnostic Nutrition is an online company. Based on 40 reviews on TrustPlane, it has an average rating of 5.0 out of 5 stars. Last reviewed January 21, 2026.
Customer Reviews
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40 reviews
My Name is Dr Lt Sagi Kalev,
My Name is Dr Lt Sagi Kalev and FDN is truly one off a KIND!!!!FDN -P was and after 14 years is still my to go to program. I joined FDN on Mr Reed Davis second class and from the start I knew that Mr Reed didn't create the course for the money but only to make health provider's like myself BETTER!!! As a Veteran my word is my VALOR and no matter if you are an MD- DO-ND- NMD- NP- PA extra you will be amazed how your outlook at healing and helping your patient's :)... You will be their Hero for a life time. I have Graduated from 3 Universities..on top of IFM- A4M- UFM,,,, EVERY single time I get asked " how are you so well rounded and what did you do to get there?... FDN program is a NO Brainer.
Dr Lt Sagi Kalev
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No Regrets!
From the first module I listened and learned from I knew this was the right place for me! As a health and wellness coach I wanted a way to offer testing for my clients! Learning that testing and not guessing is the motto at FDN! I not only learned the the why but the why and what to do for my clients! Quality thru and thru from the material, to the support and the likeminded people I met. Get started today, you won’t regret it for a second!
JoAnne
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Simply the best
Simply the best, attention to detail, and always updating key information. Attention to detail and caring for FDN clients is the blueprint for how we all should care for our clients.
Kevin
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Certification Far Exceeded My Expectations Plus Continued Education Opportunities
The FDN Certification was everything I didn't know I needed. I set out to get a certification to further my work as a practitioner and I got so much more than I could have imagined, including a supportive community, continuous learning opportunities, and the knowledge and tools to truly make a difference in the lives of others on their health rebuilding journeys. I would recommend FDN time and time again to those who are looking to get into or further their career in the health space.
Laura Burns
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Grateful for the FDN Certification Program & Membership
I learned about the FDN program several years ago, during a time when I was struggling with many unexplained physical and mental health issues. I had seen many doctors and tried a lot of things, but I was not getting enough relief. I liked the FDN concept of investigating the actual underlying reasons why I wasn't feeling great so that I could do something about it. By completing the FDN course and gaining access to functional lab work, I was able to identify the missing pieces and help myself and my family members to overcome different health challenges. I do not want others to struggle for as long as I did, so I started my own health coaching business. I now help children and adults naturally improve their mood, focus, and other brain-related problems, so that they can finally feel great, inside and out. The FDN staff and community have always been positive and helpful when I need advice. I'm grateful for my improved health and for the career opportunities that the FDN certification course has provided me.
Anita Ray Ng, BA, FDN-P
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FDN will change your life and allow you to help others do the same!
I considered many options when I was looking to get certified in health coaching/functional wellness and I'm so glad I chose FDN. As a former educator I can say that I'm truly impressed with the content format, multi-modal delivery and support I had every step of the way through the course. Plus the opportunity to participate in the same functional labs I was learning about helped me not only better understand the material, but also helped me radically improve my own health. The knowledge and tools I acquired have allowed me to feel confident working with complex clients right out of the gate. Plus, as a practicing FDN there are ongoing learning opportunities and a supportive community. If you are considering FDN my advice is "go for it," you won't be disappointed!
Jennifer Lanie
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Loved FDN
FDN is a comprehensive program that delivers high value, a beautiful community, ongoing extensive training, and amazing support. I highly recommend it to any person or practitioner who wants to gain the knowledge of how to help people with solutions that actually work.
Shiri
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FDN shifted my paradigm on health
Functional Diagnostic Nutrition shifted my paradigm on what health means! Growing up I have always believed that Western Medicine knew everything and that everything outside of it was voodoo. But as I got older and started hearing about how much that system failed people, I began to look elsewhere. I found the Health Detective Podcast, and my world shifted! The stories, what seemed to be miracles, inspired me and gave me hope that I could help others heal as well. The course is absolutely brilliant, and I love that it's self-paced. I wish there were more practical work, or "homework" to guided our learning throughout the modules. Like for every module, have a small assignment or worksheet to fill out :)
Maddy
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FDN's Training and Mentors
When I went thru the FDN course it was a place to be able to learn, grow and connect with like minded people. We became a community. I loved the knowledge, skills, and training that I received. The best part was being mentored by Tess Hanke and Brandon Molle. They were inspiring, kind, helpful and knowledgeable willing to help bring out the Health Coach in me....I loved being connected with people of this caliber...
Tisha
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This program has been amazing!!
This program has been amazing! I loved that it was self paced and had mentor sessions! I really appreciated the hands on application with self testing and practicals. I just graduated and already have my first couple clients! They are complex cases and I feel confident I can truly help them!
Stephanie Miranda
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Changed the trajectory of my health, career and community
FDN has made all of the difference in my health, my career and my community. First and foremost, FDN gave me a repeatable process to find solutions to my health and to benefit my clients. We have so many tools and resources provided. As a graduate of the course, I continue to receive benefits. The extra training, the "unmasked" guest speakers, the weekly calls and recordings available, Affiliate program (amazing platform for communicating with colleagues and a place to get more support), and there is so much more.During the course, we get to be our "first client." As part of the enrollment, we receive labs and we get our own results and recommendation calls with a mentor, so we get to experience how to help others first-hand. We learn the flow of the call and then get many opportunities to hone our skill set in the form of practicals- mock clients that we develop a protocol for and are tested on our ability to help.Lastly, but not at all the least important, I have made lifelong friends and formed community with other like-minded people whom I can look to for support and advice in my personal life and professionally. FDN seems to appeal to kind and helpful individuals that really want others to succeed. I think that draw has a lot to do with the nature of our founder, Reed Davis- who also loves to see us all succeed.
Kim Del Castillo
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FDN has changed my life
FDN has changed my life and has helped me change the lives of others. This program is like no other out there and it works. Getting to know your body is one of the greatest things you can do in the journey of life.
Clarissa
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I loved my program!
I loved my program: it was very comprehensive; there was tremendous support and extra learning such as Study Hour and Hot Topics every week. I graduated several weeks ago and feel very confident in sharing my knowledge with my clients. The practicals and reviews with my mentors helped me solidify my knowledge, walk the walk, speak about the screening and the FDN approach confidently and learn even more. My mentors were motivating, friendly and knowledgeable. Not only did I learn to help others stay well naturally, I also learned more about my own health in that I was able to do all the lab screenings on myself first. I loved this hands-on experience! I haven't seen this in any other program that I looked at before deciding to join FDN. I am eager to advance my studies by taking their advanced courses in the future. I also joined AFDNP which is a membership program after we graduate to further our education--not to mention all the other great perks. Thank you again for such a wonderful program. Proud to be a new FDN-P!
Valerie L
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Finding FDN was an answer to prayers
Finding FDN was an answer to prayers. I chose to take the course to improve my own health, but along the way I realised I could help so many other people. FDN helped me to find answers to health problems that I had been seeking for years. I have greatly reduced dosages for two prescription medications and am becoming stronger every day. I most recently reviewed an organic acids test with a mentor, and have found, what I hope is, one of the biggest pieces to my health puzzle. Based on what the mentor told me, I am now putting steps in place to improve in this area.The testing is what makes this program unique. It’s amazing to get the big picture view of what your health is and be able to set actionable steps to improve on it. Working with an FDN practitioner allows you to take control of your health.
Angela
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The FDN-P course is a must for every health practitioner
The FDN-P course is very comprehensive and detailed. I don't think there is a comparable course to ours. Reed and the fantastic team provide a lot of support and help. Once one certifies from the initial course can continue their education and further deepen their knowledge with the advanced courses. I had several health issues which I was able to resolve thanks to what I've learned from the FDN courses. It's an absolute for health practitioners.
Grazia
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Good support and quick
Good support and quick
Lori
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I have been able to resolve a lot of nagging health issues
I have been able to resolve a lot of physical and even mental issues I have dealt with for years using the methods I learned through FDN. They are a tremendous resource for healthy lifestyle guidance and functional lab analysis. I'm so thankful I found FDN!
Tracy
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An excellent organization with a great community of practitioners
I have been part of the FDN community since 2020 and it has significantly enhanced my technical knowledge and they continue to be one of the best sources of up-to-date information I've seen. Highly recommend for professionals that want to add a holistic perspective to their practice.
Juliana Leamen
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The training I needed to heal myself and help my clients
FDN provided me with the foundation I needed to heal myself back in 2014. Now I use FDN principles as the foundation on which I run my gut health clinic. The network of practitioners and support that this community provides is phenomenal. I am so grateful to be a part of this community.
Bella
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According to TrustPlane, Functional Diagnostic Nutrition has a 5.0/5 rating based on 40 verified reviews as of March 2026. Source: trustplane.app/company/functionaldiagnosticnutrition-com