What Is a Holistic Doctor? Integrative vs. Functional Medicine, What the Evidence Shows, and How to Choose a Qualified Practitioner

Search for a “holistic doctor” and you will find a wide range of practitioners: medical doctors with training in integrative medicine, naturopathic doctors, chiropractors offering nutrition counseling, acupuncturists, functional medicine clinics, and wellness coaches with no clinical license at all. The word “holistic” suggests care for the whole person, and many patients seek it after feeling rushed or unheard in conventional appointments. But the term has no legal definition, and the training, licensing, and evidence behind different practitioners vary enormously.

This guide explains the main types of holistic care, what distinguishes integrative medicine, functional medicine, and naturopathy, what the research shows about commonly used approaches, how to verify a practitioner’s credentials, and the warning signs that a practitioner may put your health at risk.

Complementary, Alternative, Integrative: What the Terms Mean

The National Institutes of Health’s National Center for Complementary and Integrative Health (NCCIH) draws a distinction that is useful for patients:

Complementary means a non-mainstream practice used together with conventional medicine, such as acupuncture alongside physical therapy for back pain.

Alternative means a non-mainstream practice used in place of conventional medicine. True alternative use, especially for serious illness, is relatively uncommon and carries the greatest risk.

Integrative health brings conventional and complementary approaches together in a coordinated way, emphasizing a multimodal approach to treating the whole person.

Holistic is a broader, informal label that practitioners of many kinds use to describe attention to physical, emotional, social, and lifestyle factors. It does not by itself tell you anything about training or approach.

The Main Types of “Holistic” Practitioners

Practitioner	Training	Licensing	Typical scope
MD or DO with integrative training	Medical school, residency, often a fellowship or certification in integrative medicine	Licensed physician in all states	Full medical practice: diagnosis, prescriptions, referrals, plus complementary approaches
Naturopathic doctor (ND)	Four-year accredited naturopathic medical program	Licensed in some states; scope varies widely	Nutrition, botanicals, lifestyle; some states allow limited prescribing
“Naturopath” (unlicensed)	Variable; may be online or correspondence courses	Not licensed as a physician	Wellness advice; cannot legally diagnose or treat disease in licensing states
Chiropractor (DC)	Doctor of Chiropractic program	Licensed in all states	Musculoskeletal care; some offer nutrition counseling
Licensed acupuncturist (LAc)	Master’s or doctoral program in acupuncture and East Asian medicine	Licensed in most states	Acupuncture, often herbal medicine
Health or wellness coach	Varies; some certifications	Not licensed to practice medicine	Behavior change support; should not diagnose or treat

Integrative medicine physicians

Many holistic doctors are conventionally trained MDs or DOs who have added training in nutrition, mind-body medicine, acupuncture, or botanical medicine. Board certification in integrative medicine is available for physicians through the American Board of Physician Specialties, and fellowship programs exist at several universities. Integrative medicine departments operate at many major academic medical centers, which typically offer services such as acupuncture, massage, nutrition counseling, and mind-body programs alongside conventional care.

Functional medicine

Functional medicine is a model of care that emphasizes identifying root causes of chronic disease through detailed history-taking, attention to lifestyle, diet, sleep, stress, and environment, and often extensive laboratory testing. It is practiced by physicians and other clinicians. Cleveland Clinic operates a Center for Functional Medicine, one of the best-known programs within a major health system.

Research on functional medicine as a model is still limited. A 2019 study in JAMA Network Open by Michelle Beidelschies and colleagues compared patients at Cleveland Clinic’s functional medicine center with matched patients in a family health center. Functional medicine patients showed significantly larger improvements in patient-reported global physical health at six months. At twelve months, improvements were similar in the main matched comparison. The study was observational, so differences in patients who choose functional medicine could affect the results. Critics also note that some functional medicine practices rely on laboratory tests with limited validation and on supplement protocols that lack strong evidence.

Naturopathic doctors

Licensed naturopathic doctors graduate from four-year accredited programs and pass board exams. The Association of Accredited Naturopathic Medical Colleges tracks which U.S. states and territories license NDs; in states without licensing, anyone may call themselves a naturopath regardless of training. Scope of practice differs widely: some states allow NDs to order tests and prescribe certain medications, while others restrict them to counseling. Naturopathic practice includes evidence-supported lifestyle and nutrition advice as well as approaches with little or no scientific support, such as homeopathy, so the quality of care depends heavily on the individual practitioner.

What to Expect at a First Visit

Visits with integrative and functional medicine practitioners usually differ from typical primary care appointments in length and focus. A first appointment often lasts an hour or more. Expect detailed questions about your medical history, medications and supplements, diet, sleep, physical activity, stress, relationships, work, and environmental exposures. Some practices send long intake questionnaires in advance.

The practitioner may review previous lab results and records, perform a physical exam, and discuss your goals. Recommendations often start with lifestyle changes, such as adjustments to diet, sleep, and activity, sometimes combined with referrals for mind-body practices, acupuncture, or physical therapy, and occasionally specific supplements or additional testing.

A good first visit should leave you with a clear plan, an explanation of why each recommendation is being made, an estimate of costs, and a sense of how progress will be measured. It should not leave you with a large bag of products you did not expect to buy or a diagnosis that seems to explain everything.

Lab Tests: Useful, Questionable, and Unproven

Laboratory testing is a major part of some holistic practices, particularly functional medicine. Some tests are standard and valuable; others are expensive and poorly validated.

Standard, well-validated tests include complete blood counts, metabolic panels, lipid panels, hemoglobin A1c for blood sugar, thyroid function tests, and measurements of specific nutrients such as vitamin B12, iron, or vitamin D when there is a clinical reason. These are the same tests conventional physicians order and are usually covered by insurance.

Tests with limited clinical use include some comprehensive stool microbiome panels and extensive hormone panels. Research on the microbiome is promising, but the ability to translate a stool report into specific, proven treatment for an individual is still limited.

Tests that are not validated for their marketed purpose include hair mineral analysis, live blood cell analysis, IgG food sensitivity panels, and “provoked” urine heavy metal tests, in which a chelating drug is given before urine collection. Medical toxicology organizations have warned that provoked urine testing produces misleadingly high results and can lead to unnecessary and potentially harmful chelation treatment. IgG antibodies to foods generally reflect exposure rather than intolerance, and allergy organizations advise against using them to diagnose food sensitivities.

Before agreeing to testing, ask what decision the result will change, whether the test is validated for that purpose, and what it costs.

How Many People Use Holistic and Complementary Care?

Use of complementary health approaches has grown substantially in the United States. A 2024 research letter in JAMA by Richard Nahin and colleagues at NCCIH, using National Health Interview Survey data, reported that overall use of complementary approaches by U.S. adults rose markedly between 2002 and 2022, with increases driven largely by practices such as yoga, meditation, and massage therapy. A growing share of people used these approaches specifically for pain management.

That growth reflects several trends: more chronic disease, dissatisfaction with short appointments, concern about opioids and other medications for pain, wider insurance coverage for some services such as acupuncture and chiropractic care, and the spread of integrative medicine programs within mainstream health systems.

What the Evidence Says About Common Approaches

Holistic care is not a single treatment, so asking whether it “works” is too broad. Evidence varies greatly among specific practices.

Lifestyle medicine

Changes in diet, physical activity, sleep, stress management, alcohol, and smoking have the strongest evidence of any “holistic” intervention for preventing and managing chronic conditions such as type 2 diabetes, heart disease, and high blood pressure. Good holistic practitioners spend much of their time here, and this is where longer appointments can make a real difference.

Mind-body practices

Yoga, tai chi, meditation, and similar practices have been studied in many randomized trials. They show benefits for chronic low back pain, stress, anxiety symptoms, sleep, and balance and fall prevention in older adults, among other outcomes. They are low-risk when taught appropriately.

Acupuncture

A 2018 individual patient data meta-analysis by Andrew Vickers and the Acupuncture Trialists’ Collaboration, pooling data from about 20,000 patients in dozens of randomized trials, found that acupuncture was more effective than both sham acupuncture and no-acupuncture controls for chronic pain conditions including back and neck pain, osteoarthritis, and headache, and that effects persisted over time. The difference between real and sham acupuncture was smaller than the difference between acupuncture and no acupuncture, suggesting that part of the benefit comes from nonspecific effects of treatment. Serious adverse events are rare when performed by trained practitioners with sterile needles.

Massage and spinal manipulation

Massage can reduce pain and anxiety in the short term. Spinal manipulation has modest evidence for acute and chronic low back pain, similar in size to other conservative treatments. Neck manipulation carries a small risk of serious complications, which patients should discuss with the practitioner.

Supplements and herbs

Evidence varies product by product. Some supplements have strong evidence for specific uses, such as vitamin D in deficiency, folic acid before and during early pregnancy, or iron for iron-deficiency anemia. Many others marketed for broad benefits have weak or inconsistent evidence. Quality and dose also vary between brands. The NIH Office of Dietary Supplements advises consumers to discuss supplements with their health care providers, noting that some interact with medications or are unsafe before surgery.

Detox protocols, IV drips, and homeopathy

“Detox” cleanses, chelation for conditions other than documented heavy metal poisoning, and IV vitamin infusions for general wellness lack good evidence of benefit and carry risks, from electrolyte problems to infections at IV sites. Homeopathy, which uses preparations diluted to the point that no molecules of the original substance typically remain, has not been shown to work better than placebo for any condition in rigorous reviews.

Supplement and Drug Interactions: A Real Risk

One of the most concrete risks in holistic care is interaction between herbs or supplements and prescription medications. NCCIH’s guidance on using dietary supplements wisely highlights several well-documented examples. St. John’s wort can reduce the effectiveness of many drugs, including birth control pills, some antidepressants, HIV medications, and transplant drugs. Supplements with blood-thinning effects, such as high-dose fish oil, ginkgo, and garlic, can increase bleeding risk with anticoagulants or before surgery. Some products marketed as supplements have been found to contain hidden prescription drug ingredients.

Patients should give every clinician a complete list of supplements, herbs, and medications, and a good holistic practitioner will ask for it and check for interactions before recommending anything new.

The Most Serious Risk: Replacing Proven Treatment

For most people, complementary approaches used alongside conventional care pose modest risks. The danger rises sharply when a practitioner encourages patients to replace effective treatment for a serious disease.

Two studies by Skyler Johnson and colleagues at Yale illustrate the stakes. A 2018 study in the Journal of the National Cancer Institute found that patients with curable breast, prostate, lung, or colorectal cancer who chose alternative medicine alone, instead of conventional treatment, had about 2.5 times the risk of death compared with patients who received conventional therapy. A follow-up study in JAMA Oncology found that patients who used complementary medicine were more likely to refuse at least one component of conventional cancer treatment, such as surgery or chemotherapy, and had a higher risk of death, a difference largely explained by those refusals.

The lesson is not that complementary care causes harm by itself, but that the setting matters. Integrative approaches that support patients through conventional treatment, such as acupuncture for nausea or mind-body practices for anxiety, are widely offered at cancer centers. Practitioners who discourage proven treatment are a different matter.

Integrative Care Inside Hospitals and Cancer Centers

Integrative medicine is not limited to independent clinics. Many academic medical centers and cancer centers have integrative medicine departments that offer acupuncture, massage, yoga, meditation, nutrition counseling, and music or art therapy alongside conventional treatment. In oncology, the Society for Integrative Oncology and the American Society of Clinical Oncology have issued joint guidelines on using integrative approaches for symptoms such as pain, anxiety, and depression in people with cancer, recommending specific therapies where evidence supports them and advising against others.

These hospital-based programs illustrate the difference between integrative care and alternative medicine. The complementary therapies are used to improve comfort and quality of life, never to replace chemotherapy, surgery, or radiation, and all clinicians share one medical record.

For patients seeking holistic care for a serious illness, an integrative program within an established health system is often the safest starting point.

Where Holistic Care Often Adds the Most Value

Holistic practitioners are often at their best with problems conventional medicine handles less well within short appointments: chronic conditions shaped by lifestyle, such as prediabetes, high blood pressure, and weight concerns; persistent pain; stress, sleep problems, and burnout; and patients who want a thorough review of how diet, activity, and habits affect their health.

Time is a genuine advantage. Research consistently shows that lifestyle changes improve many chronic conditions, but making those changes takes coaching, follow-up, and attention to the patient’s circumstances. A practitioner who spends an hour discussing sleep, meals, and stress, and follows up regularly, can help patients make changes that brief visits rarely achieve.

Holistic care is weakest when it substitutes untested protocols for established treatment, relies on unvalidated tests, or builds dependence on ongoing product purchases. The most valuable practitioners combine whole-person attention with the same standards of evidence expected elsewhere in medicine.

Common Myths About Holistic Medicine

“Natural treatments have no side effects.” Herbs and supplements are biologically active. Some cause liver injury, interact with medications, or affect bleeding and blood sugar.

“Conventional doctors reject all holistic care.” Many physicians recommend evidence-based complementary approaches, and integrative medicine is taught in many medical schools and practiced in major health systems.

“If a test finds something, it must be real.” Unvalidated tests can produce abnormal-looking results in healthy people, leading to unnecessary treatment.

“More testing means better care.” Tests are useful only when their results change decisions. Extensive panels can add cost without adding benefit.

“Holistic means anti-medication.” A holistic approach considers the whole person, which sometimes means medication is the right choice alongside lifestyle changes.

When to See a Conventional Doctor First

Holistic and integrative care can be valuable for many chronic concerns, but certain symptoms need prompt evaluation by a physician or urgent care before any complementary approach. These include chest pain or pressure, shortness of breath, sudden weakness, numbness, confusion, or difficulty speaking, unexplained weight loss, blood in stool or urine, a new lump or a changing mole, persistent fever, severe or worsening headache, and symptoms that are getting steadily worse.

A correct diagnosis comes first. Once a serious condition is ruled out or diagnosed and treated, complementary approaches can play a supportive role. A qualified holistic practitioner will refer patients with warning signs for appropriate medical evaluation rather than attempting to manage them alone.

Red Flags When Choosing a Holistic Practitioner

Most holistic practitioners are well-intentioned, and many provide valuable care. But certain patterns should prompt caution, regardless of the practitioner’s title.

Promises of cures. Legitimate practitioners talk about managing symptoms, improving quality of life, or supporting health, not about curing cancer, autism, or other serious conditions with a single protocol.

Advice to stop proven treatment. Any practitioner who encourages you to abandon effective treatment for a serious illness, or to avoid recommended vaccinations for yourself or your children, is putting your health at risk.

Selling what they prescribe. Some practitioners sell supplements directly, which is legal but creates a financial conflict. Be cautious when every visit ends with a bag of products purchased on site.

Unvalidated tests. Tests such as hair mineral analysis, live blood cell analysis, and IgG food sensitivity panels are widely offered but have not been validated for diagnosing the conditions they are marketed for. Results can lead to unnecessary restrictive diets or supplements.

One-size-fits-all diagnoses. If nearly every patient is told they have “toxins,” chronic yeast overgrowth, “adrenal fatigue,” or hidden parasites, the practitioner may be applying a template rather than evaluating you.

How to Verify a Practitioner’s Credentials

Check the state license. Every state has licensing boards for physicians, and most for chiropractors, acupuncturists, and, where licensed, naturopathic doctors. Board websites let you confirm that a license is active and whether there have been disciplinary actions.

Check board certification. For physicians, confirm specialty board certification, including integrative medicine certification if the doctor claims it.

Ask where they trained. For naturopathic doctors, graduation from a program accredited by the Council on Naturopathic Medical Education and passing the national licensing exam distinguish licensed NDs from people with unaccredited credentials.

Ask about hospital affiliations and referral relationships. Practitioners who work within or alongside health systems are more likely to coordinate with conventional care.

Questions to Ask at the First Visit

What is your training and license, and in which state?

How do you work with my primary care doctor and specialists? Will you share notes?

What evidence supports the approach you are recommending for my condition?

What are the risks, side effects, and possible interactions with my current medications?

What will this cost in total, including tests and products, and what does insurance cover?

How will we know if it is working, and when would you recommend stopping or changing course?

Do you sell the supplements or tests you recommend? Can I buy them elsewhere?

A practitioner who answers these questions clearly and without defensiveness is more likely to provide safe, patient-centered care.

Cost and Insurance

Coverage for holistic care varies widely. Visits with a licensed MD or DO who practices integrative medicine may be covered like any physician visit, although some integrative practices operate on a cash-only or membership model. Chiropractic care is commonly covered, often with visit limits. Acupuncture coverage has expanded, and Medicare covers acupuncture for chronic low back pain under specific conditions. Naturopathic visits are covered by some plans in states that license NDs. Functional medicine programs frequently charge out of pocket for extended visits and specialized laboratory tests, which can cost hundreds or thousands of dollars.

Before starting care, ask for a written estimate of total costs, including tests and supplements, and check with your insurer about coverage and whether the practitioner is in network.

Special Situations

Children. Children are more vulnerable to adverse effects from herbs, supplements, and restrictive diets. Pediatricians can help families evaluate complementary approaches, and families should be especially wary of practitioners who discourage recommended childhood vaccines or offer unproven treatments for autism or developmental conditions.

Pregnancy and breastfeeding. Many herbs and supplements have not been studied for safety in pregnancy. Check with an obstetric provider before starting any new product.

Serious or progressive illness. For cancer, heart disease, diabetes, autoimmune disease, and other serious conditions, complementary care is best used under an integrative model, coordinated with the specialists managing the disease.

Surgery. Tell your surgical team about all supplements; several can affect bleeding, anesthesia, or blood sugar and may need to be stopped beforehand.

Working With Your Primary Care Doctor

Patients often do not tell their conventional doctors about complementary care, sometimes because they expect disapproval. That gap is risky, because interactions and duplicated treatments go unnoticed. Many primary care physicians are open to discussing complementary approaches, especially those with evidence behind them, such as yoga or acupuncture for back pain. Bringing a written list of everything you take and every practitioner you see makes these conversations easier and safer. The best holistic care is genuinely integrative: all of your clinicians know what the others are doing.

Checklist Before You Book

Confirm the practitioner’s license and any board certification through your state licensing board.

Ask whether they coordinate with your primary care doctor and specialists and share visit notes.

Request a written estimate of costs for visits, tests, and any recommended products.

Check whether your insurance covers the visits and which tests are likely to be covered.

Prepare a complete list of your medications, supplements, and diagnoses to bring to the first appointment.

Decide in advance what outcome would tell you the care is helping, and how long you will give it.

Evaluating Holistic Health Claims Online

Much of what people learn about holistic health comes from social media, videos, and viral articles, where dramatic stories spread faster than careful evidence. A few habits help separate reliable information from misleading claims.

Look for the original source. Claims that a treatment cures a serious disease should link to published studies in recognized journals. If the only sources are other websites repeating the same story, treat the claim with caution.

Be wary of suppression narratives. Stories claiming that doctors, governments, or companies are hiding a cure are a common feature of health misinformation. Effective treatments are widely published, patented, and marketed, because they are valuable.

Check whether a product is being sold. Articles that end with a link to buy a supplement, program, or book have a financial motive, even when the information sounds educational.

Use trusted reference sites. The National Center for Complementary and Integrative Health and the NIH Office of Dietary Supplements publish plain-language summaries of the evidence on many complementary approaches and supplements.

Ask a clinician you trust. Bringing an article to your doctor or pharmacist is a reasonable way to check a claim before acting on it.

Frequently Asked Questions

What is a holistic doctor?

There is no legal definition. The term is used by medical doctors with integrative training, naturopathic doctors, chiropractors, acupuncturists, and others who emphasize whole-person care. Check the practitioner’s actual license and training.

What is the difference between integrative and functional medicine?

Integrative medicine combines evidence-based complementary approaches with conventional medicine in coordinated care. Functional medicine is a model focused on identifying root causes of chronic disease through detailed assessment of lifestyle, environment, and often extensive testing. Both are practiced by physicians and other clinicians; research on functional medicine as a model is still limited.

Are naturopathic doctors real doctors?

Licensed NDs complete a four-year accredited naturopathic program and a licensing exam, and are licensed in some states. They are not medical doctors, and their scope of practice varies by state. In states without licensing, anyone can call themselves a naturopath.

Is holistic medicine covered by insurance?

Sometimes. Physician visits, chiropractic care, and some acupuncture are commonly covered; naturopathic and functional medicine services are covered less consistently. Ask your insurer and the practice before starting care.

Is it safe to use holistic treatments with prescription drugs?

Often, but not always. Some herbs and supplements, such as St. John’s wort, interact with medications. Tell every clinician about everything you take.

Can holistic medicine treat cancer?

Complementary approaches can help with symptoms such as nausea, pain, anxiety, and fatigue during cancer treatment. Research has found that using alternative medicine instead of conventional treatment for curable cancers is associated with substantially higher death rates.

References

1. National Center for Complementary and Integrative Health. Complementary, Alternative, or Integrative Health: What’s In a Name? nccih.nih.gov
2. Nahin RL, Rhee A, Stussman B. Use of Complementary Health Approaches Overall and for Pain Management by US Adults. JAMA. 2024;331(7):613–615. PMID 38270938
3. Beidelschies M, Alejandro-Rodriguez M, Ji X, et al. Association of the Functional Medicine Model of Care With Patient-Reported Health-Related Quality-of-Life Outcomes. JAMA Network Open. 2019;2(10):e1914017. PMID 31651966
4. Vickers AJ, Vertosick EA, Lewith G, et al. Acupuncture for Chronic Pain: Update of an Individual Patient Data Meta-Analysis. Journal of Pain. 2018;19(5):455–474. PMID 29198932
5. Johnson SB, Park HS, Gross CP, Yu JB. Use of Alternative Medicine for Cancer and Its Impact on Survival. Journal of the National Cancer Institute. 2018;110(1). PMID 28922780
6. Johnson SB, Park HS, Gross CP, Yu JB. Complementary Medicine, Refusal of Conventional Cancer Therapy, and Survival Among Patients With Curable Cancers. JAMA Oncology. 2018;4(10):1375–1381. PMID 30027204
7. National Center for Complementary and Integrative Health. Using Dietary Supplements Wisely. nccih.nih.gov
8. NIH Office of Dietary Supplements. Dietary Supplements: What You Need to Know. ods.od.nih.gov
9. Association of Accredited Naturopathic Medical Colleges. Licensure. aanmc.org
10. American Board of Physician Specialties. Integrative Medicine. abpsus.org
11. Cleveland Clinic. Center for Functional Medicine. clevelandclinic.org

Last updated: September 26, 2026