This is an update to a review I left back in January 2026. I appreciated that Dr. Willis reached out a number of times to see how they could make this right with me. Considering I still have health concerns that I'd like to correct I felt he provided a sincere concern on how to rectify the situation. As a business owner myself that was is important to me. I am willing to go along with the program designed for me (which is much different than the first time around). I cannot say if it is going to make a difference since it's only been a week. Health issues can be very complex and achieving the desired results can and usually does take many paths. I encourage anyone seeking optimal health to at least talk with AFM with their concerns and ask the honest questions and do the research on understanding your individual health concerns. Thank you Dr. Willis for responding to my previous review. read more

I spent nearly $11,000 with Advanced Functional Medicine seeking treatment for mold-related illness and left feeling completely misled. I was not there for treatment of my autoimmune condition--I already had a neurologist managing that. I came specifically for help with mold illness, yet nearly every symptom I reported was attributed to my autoimmune disease while my mold concerns were never addressed. At the time, I was incredibly sick and so desperate to feel better, so I was willing to try almost anything that gave me hope. Because of that, it didn't take much for me to agree to finance treatment. I deeply regret that decision. My initial consultation was with Dr. Willis, but after that I never saw him again. Every subsequent appointment I had was with other staff members, such as a nutritionist. I later learned that Dr Willis was a chiropractor rather than a functional medicine physician, and there was no physician involved in my care who could prescribe medications. Most appointments were phone calls that consisted of me crying and being told to give the 'treatment' more time while my health continued to decline significantly. I also experienced repeated problems with my 'medical records' and the administrative side of my care, including errors in medical documentation and billing. In my experience, the entire process was disorganized and added to an already overwhelming situation. After months of treatment, I had accumulated a large loan while my condition continued to worsen. Ironically, I am now doing significantly better under the care of a physician who actually specializes in mold-related illness and toxicity. This experience left me feeling devastated and taken advantage of. This is my personal experience, and I hope others carefully research who will be treating them, understand their credentials and scope of practice, and think carefully before making a significant financial commitment before signing anything. read more

Advanced Functional Medicine San Diego takes a truly holistic and personalized approach to health that goes far beyond traditional medicine. Instead of simply treating symptoms, they focus on understanding the root causes of what your body is experiencing. Through comprehensive and rigorous testing, you gain real insight into how your body is functioning, where your limitations may be, and what imbalances might be affecting your overall health. What impressed me most is how Sara took the time to review the results in detail and develop a clear, individualized plan designed to restore balance and bring your body back to optimal health. Their approach combines science, nutrition, and lifestyle strategies in a way that feels thoughtful, thorough, and empowering. If you're looking for a proactive and holistic path to improving your health--one that actually helps you understand your body rather than just mask symptoms--I highly recommend Advanced Functional Medicine San Diego. read more

The front office manager, Lauren, is awesome! She'll be one of your main contacts and she definitely knows her stuff! You are in good hands with her guiding you to better health! read more

Great doctors a day staff. Expensive! Dr. Stengler Encinitas the way to go! I think optio s are always good! read more

I went to the clinic because they offered a complimentary supposedly comprehensive blood panel. They did not mention until after I scheduled that there would be a $99 fee for Lab interpretation. I figured, okay, they hasn't been up front about it, but $99 isn't much of they actually test for some things and have done insights. However, they spent maybe 3 minutes on my lab results and the rest of the visit was a big sales pitch and pressure to sign a contract right then and there. I have no doubt that they do indeed get done results for some people, but it is cost prohibitive for someone in my position. And there was no way to know just how expensive it was going to be before paying $99 to hear a sales pitch. read more

I have been going to Advanced Functional Medicine for several years off and on to assist with a previous history of Mold illness and food sensitivities. I am happy to say that AFM has been transformational in helping me to improve my health and energy levels (not to mention detoxing from the mold) and definitely recommend them to anyone struggling with tricky chronic health issues. 5 stars all the way! read more

I thought I did my research on this place before going. I read that they do not prescribe medication, but they try to get to the root of the issue by performing extensive testing. I was feeling really hopeful going into my initial consult because I'm so tired of getting the runaround from other doctors and just being given medication. I really thought this place was going to help me. Turns out, it was one big sales pitch. There were about 4 red flags before the final one that sealed the deal for me. After telling me about all these great things they can do for me, I asked "what's the cost?". His response..." we will get to that ". Immediate no from me. He tells me about the 28 day detox, the supplements, and how he thinks I would be a great candidate for the 4 month treatment plan. He then shows me a paper with prices. A 4 month plan for labs, supplements, and a grocery list is $500/month for 24 months (totaling $12,000). When I told him I could not afford or commit to that, he offered the 3 month plan ($400/month for 24 months). Wow. What a steal. Again, I told him I could not commit to that. Then he pulls out another paper where I had an option to pay over $3,000. I said I would need to consult with my fiancée before making a financial commitment like this. He continued to pressure me saying "does he know about your health issues? Does he support you? If he supports you, don't you think he'd want you to do what's good for your health?". Gross. When I walked out of the office, I sat in my truck and did more digging. Turns out, everyone is a candidate for the 4 month treatment plan, and everyone should do the 28 day detox with supplements (regardless of your health issues). Also, they apparently threatened someone with legal action for posting a bad review. Shaadyyyy!! Moral of the story....don't waste your time. Don't waste your money. Find a real doctors office that will actually help you and not send you away with supplements and a grocery list. read more

American style medicine tries to cure your problems after they develop, with drugs mainly, and fixing one problem while creating another one. What you will find out with the experts at Advanced Functional Medicine is how to minimize your time and effort with the traditional medical protocols trying to fix your health issues. AFM will instead treat the causes of ill health, guide you with the proper nutrition, after they diagnose your health using a very elaborate and deep dive into your overall conditions. With the expert advice of numerous professionals, you will see proof of improvements that their advice generates. In my case, my goal was to reverse my pre diabetes, and receive the guidance to avoid the causes. In 3 months the results were astonishing and my path forward was made clear with expert advice. Everyone at AFM is a true professional. read more

After reading some great reviews on this business, had an initial consultation today at Advanced Functional Medicine that went very well, and though I have not signed up for the program, I may in the future. The office is very beautiful, staff are friendly and courteous, and I appreciated the water and tea station. The representative who did my consultation was very courteous, and low pressure, which I really appreciated. He had reviewed my medical history that I had provided previously and was very interested in hearing what my goals would be for the program. He gave me a ball park total figure of what it would cost, let me know that financing is flexible, and that the program is all-inclusive, with patients checking in every 2 weeks. However, I received nothing in writing to take home. Also, it would be most helpful to know who the providers are and their credentials, and a cost breakdown of the program, none of which are on the website other than the owner. As a health professional myself, I feel it's important to know these things up front and not after signing up for a financial commitment . Addendum: Thank you, Dr. Willis for the notifying me of the provider list page:) read more

I have worked with Advanced Functional Medicine specifically Sarah, her and the team provided for me and easy to follow plan that helped me to lose 155 pounds and reverse type two diabetes I could not have done this without the nutrition and the education that was provided by Advanced Functional Medicine I am continuing to work with the AFM team and Sarah to continue my health journey read more

If you know nothing at all about nutrition and have diabetes, these folks will help you and you can likely see excellent results. But that's it. Nice office and friendly support staff, but they offered me literally nothing to support what I came in for (migraine headaches) after telling me they could definitely help. read more

A great group of people who work together to help YOU and YOUR nutritional needs! Thank you for not being a one-size-fits-all approach in helping me heal my body. Everyone there were very professional, friendly, accommodating, knowledgeable and seemed to really enjoy working with people. After 4 months I was able to reduce my inflammation, clear my mind, sleep better, increase my range-of-motion (with less pain), and my hearing even got better! I appreciate they give you tools/knowledge to continue on without overburdening you with supplements and special diets that you just can't stay on long term. They taught me how to get what I need through the food I eat and avoid the things that bother my body. Thanks Advanced Functional Medicine (Especially Dr. Willis, Dr. Grace, Leslie, and all the other staff!) read more

I used them 10 years ago for type 2 diabetes. They determined I was gluten and a2 milk sensitive. In 6 short weeks I was able to eliminate these foods and stop insulin and metformin with just diet control and my A1c down to 5.2 read more

The benefits I have as a graduate of this program are better sleep, even energy all day, gut health and digestion that has greatly improved. The root of my condition of prediabetes is a lowered A1C to 5.6 and I'm still getting better. Thank you AFM read more

I got a lot out of my 4 month program with Dr. Susy. She's wonderful. I was able to eliminate a lot of toxins from my system, and clean up my gut health. I didn't achieve all my weight loss goals, but I did drop 18 lbs overall. I feel a lot better and am in maintenance now. I intend to continue with my supplement routine and blood work. Dr. Susy is really a compassionate, knowledgeable practitioner. I appreciate her attention to my case. (My only criticism is that I am a vegan and they kept giving me recipes with meat and dairy. I would suggest the business consider that more and more people are turning to plant-based diets for health and that AFM should really be cognizant of that and tailor the food plans to each client rather than a "one size fits all" approach) read more

I highly recommend Advanced Functional Medicine! My husband was diagnosed with diabetes & he couldn't get a handle on it on his own. He went to see Dr. Kris Larson & it was a total game changer. Dr. Kris is so knowledgeable. Basically she holds your hand as you go through the program. Among other tools, he was given a 3 ring binder with photos of the foods to replace what he had been eating and it was more than helpful when we went shopping. In just a few months on the program my husband went from being a diabetic to PRE- diabetic! He expects to be in the "normal" range soon & his weight slowly comes down. His medical doctor is impressed The only "con" I will add is the program is pricey. The supplements & comprehensive labs, among other tests do add up. If you are able to afford it, , we definitely recommend! read more

What a genuinely caring and knowledgeable doctor and staff. I wish I would have done the program years ago. After completing it, I'm back to my optimal weight, have much better sleep quality and patterns, way less stress and anxiety, and much clearer mind and emotional function. And so much more constant and cleaner feeling energy throughout the day. Chronic pain in a few areas has gone down a lot. They were all extremely very communicative and helpful throughout the process. Also, I've been a type 1 diabetic since 1989 and my blood sugars have never been better! Thank you Dr Willis, Dr Susy, Sara, and Lauren. I can honestly say you have changed my life and put me on one heck of a positive healthy trajectory filled with hope, restoration, and healing! God bless you all! read more

Came in with major GI issues, brain fog, fatigue, and more. The care team at AFM started with a consultation and walked me step by step through the program I would take on. Went through a series of baseline exams to understand my starting point and how to tackle my issues based on data. I'm happy to say that I feel much more stable on a day to day basis and even when I have some flare ups, my body recovers more quickly and responds better. Would recommend working with AFM! read more

I have been suffering with symptoms ever since I got a virus two years ago I have been to several doctors, including gastroenterologist and no one can find out what was wrong with me advance functional medicine took several blood tests, spit tests, poop tests and did way more tests of the blood then my doctors did. They found multiple things wrong with me that my doctors doctors didn't find and the gastroenterologist didn't do the proper testing to find out that I had multiple bad bacteria, including H. pylori in my stomach. Gastroenterologist a blood test they would've found out what was causing me so many issues. We did an intense detox program. They put me on supplements to help with a lot of things I was deficient in the inflammation that has been eating away at my body. I've had multiple problems has leveled off, and in some cases has gone away from being sick every single day to even being 50 to 60% better when I've suffered for a year and nine months is so amazing and I'm just hopeful that I will continue to see good results as I continue on the program read more

It helps you realize what your body needs. We never got to meet Dr. Willis, I just suggest that you are careful in signing an agreement with them. The supplements through much research, is very expensive and no facts, or studies proving their worthiness. Call the company and they refuse to give any information on their product but tell you to call your functional doctor to get answers. read more

I received 5 star care from Advanced Functional Medicine, San Diego! The comprehensive care I received from AFM will likely extend my life for years to come. I have much more awareness of where I stand on the heath continuum! AFM is the "gold standard" of medical care which sets them apart from traditional primary care providers. Traditional PCM's manage health and chronic illnesses by utilizing HEDIS (The Healthcare Effectiveness Data and Information Set which is a tool used by more than 90 percent of U.S. health plans to measure performance on important dimensions of care and service). Some think of HEDIS as a "one size fits all" standard of care. It's a great preventative tool, however AFM surpasses by leaps and bounds what HEDIS measures. How often have you had your adrenals checked, your omega profile checked, your neurotransmitters checked, a complete hormone profile checked, and your microbiome checked, an Alzheimers genetic? Those are just a few of the tests offered by AFM that PCM's typically do not and will not order; partly due to lack of insurance approval. AFM gets to the core of your health by reviewing your health concerns, obtaining your health and family history, and obtaining a variety tests; all tailored to your specific concerns to include your health and family history; and AFM's assessment. Traditional PCM's typically do not have the time to customize a unique plan of care specific to you the patient to include continuity of care. AFM takes the time to listen to your concerns, evaluates your heath history and orders tests in an effort confirm or dispelled those health concerns and/or symptoms. AFM reviews the test results with you and develops a comprehensive care plan specific to you. And, I used my FSA which covered the associated costs! As a Registered Nurse (RN) of 35+ years in San Diego County who experienced in critical care medicine and family medicine, I understand and value great medical care. AFM San Diego surpassed my expectations! Thank you AFM! read more

Advanced Funcional Medicine helped me to lower my cholesterol and blood pressure. The team used blood test results to make sure that they were providing me with the best care for my individualized needs. I felt heard and supported. I also lost 22 lbs. over the six months I worked with the doctors at Advanced Functional Medicine. read more

I went to advanced functional medicine after being sick for over a year with chronic fatigue, daily headaches, body aches, and a seemingly constant cold. I felt like I had no immune system. I had developed chronic sinusitis and could barely breathe through my nose. As a 34 year old mother of two young boys, I had to get better. I had been seeing my regular western medicine doctor since my symptoms started. They ran all the tests and referred me to numerous specialists. None of them could find anything wrong with me. All of my results came back normal while my symptoms continued getting worse. I had thought about seeing a functional doctor for some time but didn't go because they didn't take my insurance. By the time I went to advanced functional medicine I was desperate, sick as ever and literally in tears. Within a few weeks of starting their program, I noticed an improvement but was skeptical (not wanting to get my hopes up) I thought it was probably just "a good week". But as I continued with my diet and supplement regimen I continued feeling better. Fast forward 8 months. I'm still following my diet and supplement regimen and I feel better than ever. My headaches and chronic fatigue are gone. I rarely get sick and can breathe through my nose. Paying for healthcare out of pocket isn't cheap, but you can't put a price on your health. My only regret is that I didn't go to Dr. Willis and his team sooner. read more

Dr. Willis emulates how a doctor should practice medicine! As a registered nurse with over 10 years experience specializing in cardiovascular, immunology, and preventative care, I understand the in's and out's of the system. My own personal health experiences gave me a deeper understanding in this. When I noticed changes in myself, I went to my regular doctor who gave me limited tests and ultimately told me everything looks fine, but my symptoms said otherwise. I then found Dr. Willis who changed the course of my health path forever!!! The tests he provides are so thorough you get like a 'birds eye' view of what is happening within the entire body! If he recommends certain supplements, they arrive at your doorstep in lightening speed too. Best of all, he helped prevent me from causing further damaged to my body and taught me how to heal my current state, thank you!!! RN approved! read more

With a claim of 96% success i had to check it out. No they do not have a new brand of snake oil. They use science in the form of blood and other tests to find the cause of issues, then decide upon the treatment path if any. In theory it could work. What the free chicken dinner gave me was an opportunity to pay $$$ for a session to learn what the costs are of the tests and if what i have is a condition they believe they will have success with. If all doctors could choose their patients like this their success rate would skyrocket. I wish I knew more about the tests and their costs.....after I posted that above I received a call that gave me the detail I wanted. read more

Everyone in the office is very nice, the environment is great, and you can tell the folks really care about their clients. They will teach you about nutrition, what is healthy and what to avoid, and for those who are in the dark about this, and used to the sad American diet, you will get an education about health and diet. There are a variety of people you will deal with, naturopaths, a nurse, an herbalist, a nutritionist, so get advice from a spectrum of people in the health industry. Sara the nurse is great, a shining star. I really liked her a lot. She has both the Western medicine background as well as the functional medicine. Enjoy the office, it's very soothing! Christine Schinelli read more

Wanted to give an update one year after my total transformation. I'm still going strong and truly believe the program designed for me by AFM was what solved my health issues. I got a little lazy with my diet for a little bit recently and was able to go and redo the detox program. All the needed supplements, shopping guides, and even a few recipes are included. After the first week I was already feeling back on track. I can't stress how much I appreciate this program. read more

After being misdiagnosed by an endocrinologist for my thyroid issue and almost took medication to "kill" my thyroid, I went to AFM to get a better understanding of my condition and to see how to manage it using the functional approach. I just completed a 5 month program which brought down my thyroid antibodies from the 200s to 50s. It's amazing how much your diet, supplements and change in lifestyle can do to improve your health! Dr. Susy and Dr. Grace are amazing. They truly care about helping you get better. I plan to continue working with AFM to hopefully get my Hashimoto's in remission. It is costly, but worth it! read more

Amazing experience! No longer on any blood pressure or acid reflux medications and feel so much better!

I've been to a couple of other functional medicine doctors who took some tests, gave me some supplements, and that was the end of it. Dr. Willis and his team are so different! After a thorough consultation and testing, they had a complete picture of my health from every angle. The best part is that they hold your hand and guide you through the next few months. They tell you exactly what you need to do to optimize your health. I thought I was fairly healthy, but realized that I was doing things that weren't best for my body. They helped me learn what's best for ME. Thank you to the entire team for being so helpful and supportive! read more

After suffering for 25 years with diabetes, with no significant change despite endless injections and various medications I was ready to give up ever being free of the disease. Then I heard radio personality, La Donna Harvey discuss her positive experience with Advanced Functional Medicine. I thought I'd give it a try. I met with Dr. Willis and he came up with a plan, which included extensive testing, diet and supplements. Shortly after starting the program I was able to discontinue insulin injections. Not long after that I was able to get off oral medications. I have lost 60+ pounds and feel great! My nutritionist, Dr. Trear, was amazingly knowledgeable and helped me understand which supplements my body needed to fight the diabetes. Thank you AFM for helping me get my life back! read more

I am so full of gratitude for Dr. Willis and his team. I came to Dr. Willis's office at the end of 2022 with a diagnosis of interstitial cystitis. My quality of life was at an absolute zero. I was in agonizing pain 24 hours a day and only able to eat plain oatmeal and plain salmon. I wanted to give up. Traditional doctors only offered scary prescriptions that didn't even help and made me feel like a zombie. Worst of all I was told this was a lifelong chronic condition that was incurable. When I found Dr. Willis, the most crucial thing he offered me was hope. He spent more than an hour with me on my first visit just listening. He told me I wouldn't be in pain forever and that together, we would find a way out. When I began the protocols he recommended, I struggled, because of pain, to complete them with fidelity. Each time that happened he would encourage me to finish what I could... and gradually, I began to improve. When I wanted to pursue adding the recommendations of an IC specialist to our protocols, Dr. Willis generously consulted with them. In the end, Dr. Willis's supplements and nutrition put me on a path to healing and probably most profoundly, it was the hope and encouragement he gave me. I also loved the app curable. This helped with my mental health as I navigated the physical. Dr. Willis always encouraged me to support my mental health with the physical and that helped as well. It is almost the new year... 2024 and I have my life back. I am back to everything that makes life great: surfing, honestly laughing with my kids, eating chocolate, drinking wine, being intimate with my husband... you know, the stuff that makes life great. I am forever grateful. I do still take some supplements, and I love the shakes. They honestly help me feel my best. But mostly, I live and eat normally. Which, if you are an IC sufferer, is a miracle. If you are reading this and are lost in the lonely world of IC- Call Dr. Willis and his team; they will never give up on you, and you won't be alone. IC is not incurable. You will get better. read more

I cannot thank Dr. Willis and his team for helping me heal from mold. They were so kind, understanding, and truly listen to your concerns. I would recommend them to anyone with a mystery illness feeling stuck. Thank you again! - Alyssa Johnson read more

This place has changed my life. I have struggled with diabetes for several years. I have been working with Sara and she is very knowledgeable about this specific disease. She has taught me a lot that I never knew and made it easy to understand. My numbers dramatically changed and is going down. My goal is to not use medication anymore and I am on my way! Thanks for your help and encouragement to a healthier lifestyle! read more

Would give it more than 5 stars if I could. The team is dedicated to treating underlying disease versus just symptoms. Since arriving for my first appointment, I've sorted digestive and immune issues (both connected). They also set me on a path to maintain a healthy lifestyle through providing nutrition support and easy guides. read more

I had issues with sleep, very low energy, and brain fog. None of my primary care or referral doctors suggested any other treatment besides medications. Advanced Functional Medicine gave me options outside the box to dig deeper and understand the root cause of my symptoms. Their tests and treatments brought me back to an optimal health state and alleviated all of my symptoms in 3 months. The program takes work and lifestyle changes but it is extremely with it to feel this good. read more

I am so happy with the care I received from Dr. Willis and Dr. Trear. Thank you for helping me to resolve my severe eczema by reducing my inflammation through diet and appropriate supplements. I just finished the program and now on to home care and continuing my work. The path you have set me on is awesome and completely within my control. My eczema is nearly resolved. My A1C nearly in healthy range and my thyroid condition is nearly resolved. All without medication, simply making better food choices, avoiding food triggers for inflammation, drinking more water, and taking supplements identified specifically for me through comprehensive testing. I have also lost 25 lbs, which is an awesome added benefit!! Thank you to all!! Special thanks also to my patient care coordinator, Lauren. The whole office staff is amazing. 5 star service. 5 star outcomes! read more

Advanced Functional Medicine - Focus on foods that heal. - Medical Centers Near Me - San Diego, California

I was under Advanced Functional Medicine for about two months to help decrease my cholesterol numbers. During that time, I was able to decrease my overall cholesterol numbers with the steps and plans that was laid out for me. Thank you read more

I can't thank the team at Advanced functional medicine enough for getting me on track with my health. I've had a total reset with their help . I came to them feeling defeated and on my own I was unable to get to the root cause of my health issues. I started with them in February 1, 2023 at my highest weight. Feeling exhausted I had joint pain, some serious skin/body rashes, no allergist or immunologist couldn't figure out. It's been about eight months now, I reached my goal weight and have been maintaining it . Plus I have not had any breakouts or rashes or any reactions on my skin. My pain has improved and I am continuing to eat a plant-based diet and use the supplements recommended. Plus they provided a ton of support if needed. Everyone in the office is kind and courteous I believe the team listened to me and steered me in the right direction. If it wasn't for this practice I really don't know where I would be. My deepest gratitude to all of you for all you do A-huge thank you! Definitely worth my investment! read more