Naturopathic Medicine vs. Functional Medicine: Which Approach Is Right for You?
Written by YiQiu Hu, NMD
Arizona-licensed naturopathic physician and virtual concierge medicine provider
Published August 2026 | Medically reviewed August 2026
Naturopathic medicine and functional medicine are often discussed together because both may emphasize personalized care, nutrition, lifestyle, prevention, detailed medical histories, and identifying factors that may be contributing to a patient's health concerns.
But naturopathic medicine and functional medicine are not the same thing.
One of the most important differences has little to do with supplements, laboratory testing, or treatment philosophy. It has to do with what the healthcare provider is actually licensed and trained to do.
In Arizona, naturopathic medicine is a regulated healthcare profession. Licensed naturopathic physicians complete accredited doctoral-level naturopathic medical education and practice under a defined scope established by state law. Functional medicine, by contrast, is a clinical framework that may be incorporated into the practice of professionals with many different underlying licenses.
That distinction is important when deciding which approach—or which individual healthcare professional—is right for you.
The Short Answer
If you are comparing naturopathic medicine vs. functional medicine, neither approach is automatically better.
They overlap considerably.
Both may emphasize:
Detailed medical history
Nutrition
Exercise
Sleep
Stress
Metabolic health
Preventive healthcare
Laboratory evaluation
Individualized treatment
Patient education
Long-term health planning
The biggest difference is that naturopathic medicine is a distinct healthcare profession, while functional medicine describes an approach that can be practiced by healthcare professionals with different underlying credentials.
For that reason, asking whether you should see a "naturopathic doctor or functional medicine doctor" is only part of the question.
You should also ask:
What professional license does this person actually hold, what training have they completed, and what are they legally qualified to diagnose and treat?
What Is Naturopathic Medicine?
Naturopathic medicine is a healthcare system that combines medical evaluation with an emphasis on preventive care, nutrition, lifestyle medicine, patient education, and natural treatment options when appropriate.
Licensed naturopathic physicians may evaluate symptoms, obtain medical histories, perform physical examinations, order laboratory testing, diagnose medical conditions, develop treatment plans, and use therapies permitted within their state's scope of practice.
The exact scope varies considerably by state.
Arizona regulates naturopathic physicians through the Arizona Naturopathic Physicians Medical Board, which oversees the profession within the state.
Naturopathic physicians typically complete a four-year doctoral program accredited by the Council on Naturopathic Medical Education and must satisfy licensing requirements in jurisdictions where naturopathic medicine is regulated. CNME describes its accredited programs as four-year, primarily campus-based doctoral programs designed to qualify graduates for licensure in the United States and Canada.
You can explore the broader philosophy, training, and role of naturopathic physicians in our Naturopathic Medicine Resource Center.
What Is Functional Medicine?
Functional medicine is better understood as a clinical framework or method of approaching patient care rather than a separate medical license.
The Institute for Functional Medicine describes functional medicine as a personalized, systems-oriented approach that evaluates genetic, environmental, lifestyle, and physiologic factors that may contribute to illness.
A functional medicine practitioner might originally be trained as a:
Medical doctor
Osteopathic physician
Naturopathic physician
Nurse practitioner
Physician assistant
Registered dietitian
Other healthcare professional
The person's underlying profession remains extremely important.
Functional medicine education or certification does not automatically give someone the legal authority to diagnose disease, prescribe medication, order certain tests, or perform medical procedures.
The Institute for Functional Medicine specifically notes that its credentials are voluntary and do not grant additional legal or specialty status or expand a practitioner's professional scope of licensure.
In other words:
"Functional medicine practitioner" tells you something about the person's approach to healthcare. It does not, by itself, tell you everything about the person's medical credentials.
Where Do Naturopathic and Functional Medicine Overlap?
There is substantial overlap between the two approaches.
A patient visiting either type of practice may notice that the clinician spends significant time asking about more than the immediate symptom.
For example, an evaluation might consider:
Nutrition
Physical activity
Sleep quality
Stress
Medications
Supplements
Family history
Weight and metabolic health
Gastrointestinal symptoms
Hormonal factors
Environmental exposures when clinically relevant
Previous laboratory findings
Long-term health goals
Both approaches may also place greater emphasis on understanding why a problem developed or what factors may be perpetuating it, rather than viewing each symptom entirely in isolation.
However, the phrase "root cause" should be used thoughtfully.
Many chronic medical conditions do not have one simple root cause. Genetics, aging, lifestyle, medications, environment, socioeconomic factors, physiology, and other medical conditions may all contribute simultaneously.
Good medical care therefore involves identifying modifiable contributing factors while remaining grounded in established diagnosis, evidence, and patient safety.
How Does Diagnostic Testing Differ?
Both naturopathic and functional medicine practitioners may use laboratory testing extensively.
The important question is not simply how many tests are ordered.
The more useful question is:
Will the result provide meaningful information that could change diagnosis, treatment, monitoring, or medical decision-making?
Routine testing may include established evaluations such as:
Complete blood count
Comprehensive metabolic panel
Lipid testing
Blood glucose or hemoglobin A1c
Thyroid testing
Urinalysis
Iron studies
Selected vitamin or nutrient levels
Hormone testing when indicated
You can learn more about commonly used testing in our Routine Laboratory Testing Resource Center.
Both naturopathic and functional medicine practices may also use more specialized testing.
Some specialty tests can provide useful clinical information in appropriately selected situations. Others may have uncertain clinical significance, limited validation, or little evidence that testing improves patient outcomes.
For this reason, more testing is not automatically better healthcare.
Before ordering an advanced test, patients should understand:
What question the test is intended to answer.
How reliable and clinically validated the test is.
Whether the result would actually change treatment.
What the testing costs.
Whether a more established or less expensive test could answer the same question.
Our Specialty Laboratory Testing Resource Center discusses these considerations in greater detail.
How Do Treatments Compare?
Naturopathic and functional medicine treatment plans can look remarkably similar in some practices and very different in others.
Naturopathic Medicine May Include
Depending on the patient's needs, physician training, and applicable scope of practice, naturopathic treatment may incorporate:
Nutrition
Exercise
Sleep optimization
Stress management
Behavioral changes
Nutritional supplementation
Botanical medicine
Physical medicine
Acupuncture in appropriately trained practices
Prescription medications when appropriate and permitted
Diagnostic testing
Preventive screening
Coordination with specialists
Other naturopathic therapies
The goal should not be to use a natural treatment simply because it is natural.
Natural substances can have side effects, medication interactions, contraindications, and inconsistent evidence. The National Center for Complementary and Integrative Health emphasizes that "natural" does not automatically mean safer or more effective.
Treatment should be selected according to the patient's diagnosis, evidence, potential benefits, possible harms, preferences, and alternatives.
Functional Medicine May Include
Functional medicine treatment commonly emphasizes many of the same foundational strategies:
Nutrition
Exercise
Sleep
Stress reduction
Metabolic health
Behavioral change
Nutritional supplements
Correction of documented deficiencies
Management of contributing medical conditions
Medication when permitted and appropriate
However, the treatments available depend heavily on the practitioner's original profession and legal scope.
For example, functional medicine training does not independently give a nutrition professional, chiropractor, nurse, naturopathic physician, MD, DO, or other clinician identical authority to diagnose, prescribe, or perform procedures.
Their underlying professional licenses remain different.
Does Functional Medicine Use More Supplements?
Sometimes—but not necessarily.
Supplement use varies dramatically between practitioners in both naturopathic and functional medicine.
A responsible treatment plan should not automatically result in a patient leaving with a large collection of supplements.
Supplementation may be reasonable when there is:
A documented deficiency
A clinically meaningful nutritional need
Evidence supporting its use for a particular condition
A favorable benefit-to-risk profile
A clear therapeutic goal
Patients should also be told about possible medication interactions, side effects, duration of treatment, and whether follow-up testing is needed.
The same standard should apply regardless of whether a treatment is called naturopathic, functional, integrative, conventional, or natural.
What About Prescription Medications?
One misconception about naturopathic medicine is that naturopathic physicians never use prescription medications.
That is not necessarily true.
Prescribing authority depends on the jurisdiction. Arizona has a defined statutory and regulatory scope for licensed naturopathic physicians, including prescribing authority subject to applicable laws and regulations.
A naturopathic physician may therefore determine that a prescription medication is the safest or most effective treatment for a particular patient.
Likewise, an appropriately licensed MD, DO, NP, PA, or other prescribing clinician who practices functional medicine may prescribe medications when appropriate.
The goal should not be to automatically choose natural versus conventional medicine.
The goal should be to choose the treatment with the most appropriate balance of evidence, safety, effectiveness, patient preference, and clinical practicality.
Which Approach Is More Evidence-Based?
This question cannot be answered accurately by declaring one entire field "evidence-based" and the other "not evidence-based."
Both naturopathic medicine and functional medicine include interventions with very different levels of scientific support.
Nutrition, exercise, smoking cessation, appropriate sleep, weight management, blood-pressure control, diabetes management, preventive screening, and treatment of documented nutritional deficiencies have substantial medical evidence behind them.
Other interventions may have promising but incomplete evidence.
Still others may have little reliable evidence or may not be appropriate for a particular condition.
The National Center for Complementary and Integrative Health similarly emphasizes evaluating complementary interventions based on the scientific evidence for each specific therapy.
A useful question for any practitioner is:
"What evidence supports this particular recommendation for my situation?"
That question is usually more informative than asking whether an entire philosophy of medicine is evidence-based.
Is a Naturopathic Physician the Same as a Functional Medicine Doctor?
No.
The terms describe different things.
A licensed naturopathic physician has completed naturopathic medical education and obtained professional licensure in a jurisdiction that regulates naturopathic medicine.
A functional medicine practitioner is someone using a functional medicine framework within their existing healthcare profession.
Some naturopathic physicians may pursue additional functional medicine training.
Similarly, MDs, DOs, nurse practitioners, physician assistants, and other healthcare professionals may study functional medicine.
Therefore, a naturopathic physician can potentially incorporate functional medicine concepts into practice, but the terms are not interchangeable.
Which Approach May Be Right for You?
Instead of choosing based only on the words naturopathic or functional, evaluate the actual clinician.
You May Prefer a Licensed Naturopathic Physician If:
You want a healthcare professional whose formal medical education specifically integrates conventional medical sciences with naturopathic principles, nutrition, lifestyle medicine, and natural treatment modalities.
For Arizona patients, the NMD or ND credential also provides a clearly regulated professional pathway with a state licensing board and defined scope of practice.
You May Prefer a Functional Medicine Practitioner If:
You specifically want a systems-oriented functional medicine framework and have identified a practitioner whose underlying medical credentials, experience, and scope match your healthcare needs.
For example, one patient may prefer a functional medicine MD, while another may prefer a functional medicine-trained naturopathic physician.
The words "functional medicine" alone are not enough to determine which practitioner is more appropriate.
Five Questions to Ask Before Choosing Either Type of Practitioner
Before establishing care, consider asking:
What is your underlying professional license?
Do not rely solely on terms such as functional, holistic, wellness, or natural medicine.What education and postgraduate training have you completed?
Understand both the clinician's foundational healthcare education and any additional training.How do you decide which laboratory tests are necessary?
Testing should have a clinical purpose rather than being ordered automatically.How do you evaluate the evidence for supplements and other treatments?
Ask how benefits, risks, alternatives, medication interactions, and costs are considered.Are you willing to prescribe conventional treatment or refer to another physician when appropriate?
A good clinician should recognize when another treatment, specialist, urgent care, hospital evaluation, or emergency service is needed.
What Should Arizona Patients Know?
Arizona is particularly important in this comparison because naturopathic physicians are licensed and regulated by the state.
Patients can verify naturopathic physician licensing through the Arizona Naturopathic Physicians Medical Board.
Functional medicine, on the other hand, does not have a separate Arizona medical license.
If someone advertises functional medicine services, patients should determine what professional license that individual holds underneath the functional medicine designation.
That license determines what the clinician is legally qualified to do.
Can Naturopathic and Functional Medicine Be Combined?
Yes.
These approaches are not mutually exclusive.
A licensed naturopathic physician may incorporate functional medicine concepts, just as an MD, DO, or other healthcare professional may incorporate nutrition, lifestyle medicine, preventive care, or complementary approaches.
Healthcare increasingly overlaps across traditional labels.
The more important questions are:
Is the clinician appropriately trained and licensed?
Is the evaluation medically sound?
Are tests being ordered for a legitimate clinical reason?
Are recommendations supported by reasonable evidence?
Are potential harms and interactions considered?
Is conventional treatment used when it is the better option?
Does the practitioner recognize when referral or higher-level care is necessary?
Those considerations often matter more than what the practice calls itself.
Frequently Asked Questions
Is functional medicine the same as naturopathic medicine?
No. Naturopathic medicine is a distinct healthcare profession, while functional medicine is a clinical framework that can be used by practitioners from different licensed professions.
Can a naturopathic physician practice functional medicine?
A naturopathic physician may incorporate functional medicine concepts or pursue additional functional medicine education as long as care remains within the physician's legal scope of practice. Functional medicine certification is separate from naturopathic medical licensure.
Do functional medicine doctors have medical degrees?
Some do and some do not.
The term "functional medicine practitioner" does not identify one specific professional degree. A practitioner may be an MD, DO, ND/NMD, nurse practitioner, physician assistant, dietitian, or another healthcare professional depending on their background and training.
Always verify the person's actual professional credentials.
Which approach uses more laboratory testing?
Either may use extensive laboratory testing. Testing patterns depend more on the individual practitioner than the label.
The most important issue is whether a test is clinically appropriate, validated for its intended purpose, and likely to influence medical decision-making.
Which approach is better for chronic health concerns?
There is no universal answer.
The best clinician depends on the condition being evaluated, the practitioner's credentials and experience, the quality of the diagnostic process, available treatment options, and the patient's individual needs.
Some chronic conditions can be managed in primary care, while others require specialists or multidisciplinary care regardless of whether naturopathic or functional medicine is also involved.
The Bottom Line
Naturopathic medicine and functional medicine share many similarities, particularly their emphasis on individualized care, nutrition, lifestyle, prevention, and understanding factors that may contribute to illness.
But there is an important structural difference:
Naturopathic medicine is a distinct licensed healthcare profession in Arizona. Functional medicine is an approach that healthcare professionals from different backgrounds may incorporate into their existing practice.
That means choosing between the two should not be based on the label alone.
Look carefully at the practitioner's education, underlying license, clinical experience, diagnostic methods, treatment philosophy, use of scientific evidence, and willingness to coordinate with other healthcare professionals.
For Arizona patients specifically seeking physician-level naturopathic care, a state-licensed naturopathic physician provides a clearly defined educational and regulatory pathway.
If you are interested in learning more, explore our Naturopathic Medicine Resource Center or read What Is Naturopathic Medicine? A Complete Guide for Arizona Patients.
You can also learn more about how diagnostic information should be selected and interpreted through our Routine Laboratory Testing and Specialty Laboratory Testing resource centers.
If you are considering personalized naturopathic medical care in Arizona, you can also contact Ask Dr. Hu to learn more about available services.
Medical Review, Editorial Standards, and Transparency
This article was written and medically reviewed by YiQiu Hu, NMD, an Arizona-licensed naturopathic physician and concierge medicine provider.
Information regarding naturopathic medical education and professional regulation was reviewed with reference to the:
An important distinction in this article is that functional medicine education or certification does not itself create a new healthcare license or expand a professional's existing legal scope of practice. The Institute for Functional Medicine specifically states that its credentials are voluntary and must be used within the practitioner's underlying professional scope.
Transparency statement: Ask Dr. Hu provides naturopathic medical care and therefore has a financial interest in patient education about naturopathic medicine. This article is intended to provide a balanced comparison rather than suggest that naturopathic medicine is inherently superior to functional medicine. Provider qualifications, evidence, patient safety, scope of practice, and appropriateness of care should be evaluated individually.
Information on this page is provided for general educational purposes and does not replace individualized medical evaluation or establish a physician-patient relationship.
Last medically reviewed: August 2026
About the Author
YiQiu Hu, NMD
Dr. YiQiu Hu is an Arizona-licensed naturopathic physician, founder of Ask Dr. Hu, and medical director. His clinical work includes concierge medicine, preventive healthcare, health optimization, laboratory evaluation, chronic disease management, medical weight management, hormone care, and individualized treatment planning.
Dr. Hu's approach emphasizes thoughtful medical evaluation, clear patient education, preventive healthcare, evidence-informed treatment options, and appropriate integration of conventional and naturopathic approaches based on each patient's individual needs.