Find Healing & Relief

If you have been to all the doctors, done all the tests, taken all the drugs, but you’re just as sick or sicker, my heart goes out to you. I want to help you find real answers. Your illness has a cause. Let’s find that cause and fix it using the best science and nutrition!
I work with patients in the office locally and over the phone or Skype nationwide.

Dr Kilcup
Dr kilkup smiling

Functional Medicine



Is This You?

Are you frustrated with traditional medicine?
Are you tired of doctors who tune you out as soon as you ask about alternative treatment options?
Do you want to get to the root of what’s causing your health problem?
Have you been told that all your tests are normal, but you’re still sick?
Do you want to get well without taking drugs?
Are you taking a bunch of prescriptions or supplements or both and are still sick?

Dr. Kilcup can help you find real answers

Chronic conditions are often a result of more than one component of the body not working correctly. I see many patients who have been to one or more doctors without finding relief. Usually the other doc has treated PART of the patient’s problem but neglected other dysfunctional components. As a result, the patient either experienced partial relief or no relief at all. Every part of the system is as important as another because they work together. Just like baking a cake, every ingredient is important if you want to get a delicious dessert. I find that if we identify and address every aspect of the patient’s problem we get excellent results.

Dr. Kilcup specializes in helping people who have conditions like these:

Gastrointestinal Health

Irritable Bowel Syndrome (IBS), Small Intestine Bacterial Overgrowth (SIBO), Acid Reflux, Leaky Gut, Food Intolerances, C-DIFF


Chronic Fatigue Syndrome, Adrenal Fatigue, Hypo Thyroid

Hormone Imbalances

Adrenal, Thyroid, Sex Hormones

Mental Health

Anxiety, Depression, Insomnia, Brain Fog, PMS, ADD, Hyperactivity

Migraine Headaches

Chronic Headaches and Migraines

Autoimmune Diseases

Celiac Disease, Hashimoto’s Disease, Rheumatoid Arthritis (RA), Multiple Sclerosis (MS), Lupus, Crohn’s Disease, Ulcerative Colitis

Chronic Infections

Parasites, Tick-Borne Pathogens,
Epstein-Barr Virus, Cytomegalovirus


Metal and Heavy Metal Toxicity, Chemical, Mold


General Joint & Body Pain Syndromes

Back & Neck Pain

Chiropractic Care & Massage

If this is you, you are not alone and I can help

I work with people all over the country and I am passionate about bridging the best of safe, effective, wholesome healthcare with rock solid science.

Our Approach

You want a doctor to listen intently to you. You want a doctor to be honest, and if you can be best helped somewhere else, refer you to the appropriate professional. You want a doctor to honor you by explaining, to your satisfaction, what your problem is and the best treatment options. You don’t want a cookie cutter approach to care. You want a doctor who is just as concerned about saving you money as you are. You want the doctor to treat you exactly like he or she would want to be treated. How’s that? This is what I strive to do with each and every patient.


Objective Diagnostic Testing

I don’t guess about your health. I want to give my patients answers that are based on the best of science.

Non-Drug Approach

I never prescribe drugs as part of a patient’s treatment. I will educate you about your drugs, but I leave decisions about taking them up to you and your doctor.

Personal Care

My patients are treated with kindness, compassion, respect and honesty. Besides helping my patients physically I want to bring a little joy into their lives.

Addresses Total Body Systems

Everything is connected. I take into account emotions, diet, lifestyle and all of the body systems when I’m working with a patient.

Treats Root Causes

I don’t treat diseases. What caused your health problem is what I’m interested in.

Nutrition Based

Treatment recommendations consist of lifestyle, diet and specific nutrients based upon objective testing.

Individualized Treatment Plan

No two people are the same. No two treatment plans are the same. My patients get the treatment that is best for them.

Focuses on Long-Term Healing & Health

Finding the underlying problems that are causing your symptoms will help in the short term, but the goal is to get my patients truly healthy so they live a long healthy life.

Functional Medicine

Personalized care with custom treatment plans addressing the underlying causes of disease.

hyperbaric therapy

Hyperbaric Therapy

Pressurized oxygen used to dramatically increase healing and optimize cell recovery.

Red Light Therapy

Red Light Therapy

Gentle therapy used to promote healing & restoration to benefit skin rejuvenation, pain management, and cognitive function.


Hands-on adjustments that realign, relieve pain, and enable the body to heal itself without surgery or medication.


Therapeutic massage relieving painful, tight muscles while melting stress and tension.

I have been going to Dr. Kilcup for several months now and the change has been tremendous. Among other things, I had severe menstrual cramps, migraines, hair loss, exhaustion, anxiety, and brain fog. I had been to several different doctors and they couldn’t figure out what was wrong with me. Dr. Kilcup actually took the time to speak with me regarding all of my issues and then ordered testing to verify the problems. He didn’t just write me off, or order one blood test and tell me everything was fine. He cares about his patients and wants to help them have a better quality of life. I can tell you that almost all of my issues are better or gone. I’ve never been able to work out because I felt so terrible all the time and now I’m training for a half marathon! I’ve never felt this good in my entire life and it’s honestly thanks to Dr. Kilcup.

~Elisha Swier

I went to Dr. Kilcup originally for help with insomnia. I would get 1-3 hours of sleep every night at the most. Also, every time I ate I would feel really sick. Obviously I couldn’t stop eating and I needed to sleep eventually so I went to Dr. Kilcup for help. He asked me about my symptoms and was able to quickly diagnose me. He was great about being up front with me and explained his conclusion in a way I would understand. Then, he got me on an all natural plan to fix it. This involved a strict diet and natural supplications. Although it wasn’t fun cutting half my diet out, I felt so incredible after a month and it was easier after that. I was sleeping at least 5 hours a night easy, and I didn’t feel sick at all! I finally felt normal! I would definitely recommend Dr. Kilcup for anyone who would like a natural fix for digestion problems.

~ Aletheia Birch



What is the background of Dr. Darrell Kilcup as a functional medicine practitioner?

Dr. Darrell Kilcup has a background as a chiropractor and functional medicine practitioner. He received his Doctor of Chiropractic degree from Southern California University of Health Sciences, and has also completed advanced training in functional medicine through the Institute for Functional Medicine. Dr. Kilcup integrates chiropractic care, functional medicine, and nutrition counseling to provide a holistic approach to health and wellness.

How does Dr. Darrell Kilcup approach patient care differently from traditional medical doctors?

Dr. Darrell Kilcup takes a holistic approach to patient care, which differs from the traditional medical model. He focuses on identifying and addressing the root causes of health problems, rather than just treating symptoms. Dr. Kilcup also emphasizes the importance of nutrition and lifestyle factors in promoting overall health and wellness, and works with patients to develop individualized treatment plans that address their unique needs and goals.

What types of conditions does Dr. Darrell Kilcup treat with functional medicine?

Dr. Darrell Kilcup uses functional medicine to treat a variety of conditions, including digestive disorders, hormonal imbalances, autoimmune diseases, chronic pain, and fatigue. He also works with patients to manage chronic conditions such as diabetes, heart disease, and high blood pressure, and to prevent disease through nutrition counseling and lifestyle modifications. Additionally, Dr. Kilcup provides chiropractic care to address musculoskeletal problems such as back pain, neck pain, and headaches.

How long does it typically take to see results with functional medicine treatment?

Patients undergoing functional medicine treatment typically start to see results during their initial round of treatment, but it’s important to note that several rounds of testing and treatment may be necessary to fully address all underlying health issues. Achieving optimal health and wellness is a process that takes time, patience, and commitment, and results can vary depending on the individual’s specific condition and circumstances.

Is functional medicine covered by insurance?

Functional medicine is generally not covered by insurance, as it is considered a form of alternative or complementary medicine. However, some aspects of functional medicine, such as Blood Work, may be covered by certain insurance plans. Patients are advised to check with their insurance provider – our office can assist you in this! We also accept HSAs.

Can patients still see their primary care physician while working with Dr. Darrell Kilcup?

Yes, patients can still see their primary care physician while working with Dr. Darrell Kilcup. However, it’s important to note that Dr. Kilcup’s approach to patient care differs from traditional medical care, and patients may find that their primary care physician is less familiar with functional medicine practices. Patients are encouraged to communicate openly with both Dr. Kilcup and their primary care physician to ensure that all aspects of their care are coordinated and in line with their overall health goals.

What is the process like for becoming a patient of Dr. Darrell Kilcup?

To become a patient of Dr. Darrell Kilcup, interested individuals can fill out the new patient form located under the ‘Get Started with Functional Medicine’ button on the website. Once the form is submitted, you will get a link schedule for an initial consultation after Dr. Kilcup looks over your history. During the consultation, Dr. Kilcup will review the patient’s medical history and recommend the necessary testing.

Are there any age restrictions for patients seeking functional medicine treatment from Dr. Darrell Kilcup?

There are no age restrictions for patients seeking functional medicine treatment from Dr. Darrell Kilcup. In fact, babies and children can benefit greatly from functional medicine, as it can help identify and address underlying issues that may be affecting their health and development. Dr. Kilcup works with patients of all ages to develop personalized treatment plans that address their unique needs.

How often do patients typically need to visit Dr. Darrell Kilcup for treatment?

After the initial testing and evaluation, patients typically need to visit Dr. Darrell Kilcup every 3-4 months. During these appointments, Dr. Kilcup will review their progress and re-evaluate their treatment plan as needed. Patients will also undergo re-testing to track their improvement and adjust their treatment plan accordingly. This personalized approach allows for ongoing support and monitoring to achieve optimal health and wellness.

Can patients who do not live in the Phoenix area still work with Dr. Darrell Kilcup remotely?

Yes, patients who do not live in the Phoenix area can still work with Dr. Darrell Kilcup remotely. Dr. Kilcup offers virtual consultations and telemedicine services, allowing patients to receive functional medicine treatment from anywhere in the world. Remote patients can expect the same high level of personalized care and attention as in-person patients, with the added convenience of being able to participate from the comfort of their own home.

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