Roughly one in three American adults uses some form of complementary health approach in any given year, a figure that has climbed steadily over the past two decades. The term covers a wide range of practices, from yoga and meditation to acupuncture, chiropractic care, herbal supplements, and music therapy. What makes the category useful, and occasionally confusing, is its breadth: it includes practices backed by large randomized trials alongside others where the evidence is still thin. Understanding which approaches do what, and how strong the supporting science actually is, matters more than any blanket verdict.
How Common These Approaches Are and Who Uses Them
National survey data tracking U.S. adults from 2002 through 2022 shows that the proportion reporting use of at least seven common complementary approaches rose from about 19% to roughly 37%.1JAMA. Use of Complementary Health Approaches Overall and for Pain Management by US Adults Earlier estimates that included a broader list of practices pegged usage around a third of adults throughout the 2000s, with a brief peak near 36% in 2007.2PubMed Central. Trends in the Use of Complementary Health Approaches Among Adults: United States, 2002–2012 However you slice the surveys, the trend line points upward, driven largely by yoga and meditation. Yoga use roughly tripled between 2002 and 2022, and meditation became the single most commonly reported approach, used by about 17% of adults in 2022.3JAMA. Use of Complementary Health Approaches Overall and for Pain Management by US Adults
Children and adolescents use these approaches too, though less often. A systematic review pooling data from multiple countries found a short-term prevalence of about 23%, with lifetime prevalence reaching nearly 78%.4PubMed. Prevalence of Complementary Medicine Use in Children and Adolescents: A Systematic Review Use varies considerably by country and by the child’s underlying condition, with higher rates reported among children with chronic or complex health problems.5Italian Journal of Pediatrics. Use of complementary and alternative medicine in children affected by oncologic, neurologic and liver diseases: a narrative review
Pain Is the Biggest Driver
Among adults who use any complementary approach, pain management is the most commonly cited reason. The share of users reporting pain as a motivation rose from about 42% in 2002 to nearly 50% in 2022.6JAMA. Use of Complementary Health Approaches Overall and for Pain Management by US Adults Chiropractic care stands out here: among people seeing a chiropractor, roughly 86% report doing so for pain. People with chronic pain are more than twice as likely to use complementary approaches compared with those without chronic pain, and satisfaction rates among chronic pain users are high, above 93% for at least one approach.7PubMed Central. The Association of Chronic Pain and Complementary Health Approach Usage: A Comprehensive Analysis Adjusting for Demographics That pattern tells a story about gaps in conventional care: people who are not getting adequate relief from standard treatments look elsewhere.
Mind-Body Practices and What the Trials Show
Yoga, meditation, and tai chi sit in a category called mind-body practices, and they carry some of the best-studied evidence in complementary health. Each works through somewhat different mechanisms and addresses different outcomes.
For chronic low back pain, yoga performs about as well as other non-drug treatments in reducing disability, and it appears more effective than doing nothing or continuing usual care alone for reducing how bothersome the pain feels.8PubMed Central. Yoga as a treatment for chronic low back pain: A systematic review of the literature One trial of Iyengar yoga for mild chronic low back pain found that participants reported a 64% reduction in pain intensity and an 88% drop in pain medication use, improvements that persisted at a three-month follow-up.9PubMed. Effect of Iyengar yoga therapy for chronic low back pain These are encouraging numbers, though that trial was small and recruited self-referred participants, a group that tends to be more motivated than average.
Meditation, particularly mindfulness-based programs, has been studied for both mental health and biological markers. A systematic review of randomized trials found that mindfulness meditation was linked to reductions in certain inflammatory markers and to increases in immune cell counts in HIV-positive individuals.10PubMed Central. Mindfulness meditation and the immune system: a systematic review of randomized controlled trials On the stress side, a mindfulness-based intervention study found decreases in a salivary marker of sympathetic nervous system activation, along with changes in cortisol patterns, compared to controls.11Psychophysiology. Effects of a mindfulness‐based intervention on mindfulness, stress, salivary alpha‐amylase and cortisol in everyday life The proposed mechanism is that meditation dampens the body’s stress response systems, which in turn eases downstream effects on inflammation and immune function.
Tai chi has carved out a niche in fall prevention for older adults. A meta-analysis of 24 randomized trials found that tai chi reduced the risk of falls by about 24%, and the benefit increased with longer and more frequent practice.12PubMed Central. Tai Chi for fall prevention and balance improvement in older adults: a systematic review and meta-analysis of randomized controlled trials Part of the explanation appears to be improved proprioception, the body’s ability to sense where its limbs are in space. A meta-analysis focused on adults over 55 found moderate to strong evidence that tai chi improves ankle and knee proprioception.13PubMed. Effects of Tai Chi on Lower Limb Proprioception in Adults Aged Over 55: A Systematic Review and Meta-Analysis Long-term tai chi practitioners also showed better stability limits, meaning they could lean further without losing balance and reacted faster when their balance was challenged.14PubMed. Effects of tai chi on joint proprioception and stability limits in elderly subjects
Spinal Manipulation for Back and Neck Pain
Chiropractic spinal manipulation is one of the most widely used complementary approaches, and the evidence paints a specific picture: it works about as well as other recommended therapies, not dramatically better. For acute low back pain, a meta-analysis of 15 trials found a moderate improvement in pain on a 100-point scale, roughly a 10-point average improvement.15JAMA. Association of Spinal Manipulative Therapy With Clinical Benefit and Harm for Acute Low Back Pain: Systematic Review and Meta-analysis For chronic low back pain, a separate systematic review found similar effects to other recommended therapies for pain relief and a small advantage for function.16BMJ. Benefits and harms of spinal manipulative therapy for the treatment of chronic low back pain: systematic review and meta-analysis of randomised controlled trials
Clinical guidelines generally recommend spinal manipulation as one option among several for spine pain, often alongside exercise. It may serve as a frontline intervention for low back pain, and it is recommended in combination with exercise for neck pain.17PubMed Central. Clinical Effectiveness and Efficacy of Chiropractic Spinal Manipulation for Spine Pain The safety profile is generally reassuring: serious adverse events are rare, though minor side effects like temporary soreness, muscle stiffness, and headache are common, occurring in over half of patients in large case series.18JAMA. Association of Spinal Manipulative Therapy With Clinical Benefit and Harm for Acute Low Back Pain: Systematic Review and Meta-analysis Whether spinal manipulation outperforms a convincing placebo (sham manipulation) remains uncertain because the quality of sham-controlled evidence is low.19BMJ. Benefits and harms of spinal manipulative therapy for the treatment of chronic low back pain: systematic review and meta-analysis of randomised controlled trials
Natural Products and the St. John’s Wort Case Study
Herbal supplements are among the most popular complementary approaches and also among the trickiest to evaluate. St. John’s wort for depression is arguably the most-studied herbal product in psychiatry, and the results are instructive. A meta-analysis comparing St. John’s wort extract directly with SSRIs (the standard antidepressant class) found essentially no difference in clinical response rates, remission rates, or score reductions on depression rating scales.20PubMed Central. A meta-analysis on the efficacy and safety of St John’s wort extract in depression therapy in comparison with selective serotonin reuptake inhibitors in adults That sounds like a win, but the picture is more complicated. A re-analysis of one major placebo-controlled trial that carefully accounted for missing data found that some statistical models showed sertraline (an SSRI) separating from placebo, while St. John’s wort did not reliably separate from placebo.21PubMed Central. The impact of missing data on clinical trials: a re-analysis of a placebo controlled trial of Hypericum perforatum (St Johns wort) and sertraline in major depressive disorder The practical takeaway: St. John’s wort may help with mild to moderate depression, but the evidence is less convincing for severe cases.
The bigger concern with St. John’s wort is drug interactions. Its active ingredient, hyperforin, revs up a liver enzyme called CYP3A4, which is responsible for metabolizing a huge number of prescription drugs. That means St. John’s wort can make other medications less effective by speeding up how quickly your body breaks them down.22PubMed Central. Cytochrome P450 enzyme mediated herbal drug interactions (Part 1) This is a real clinical hazard. It can reduce the effectiveness of birth control pills, blood thinners, HIV medications, and immunosuppressants, among others. Herbal supplements more broadly can interact with prescription drugs by either inducing or inhibiting these same liver enzymes, and some supplements have been associated with liver toxicity through these pathways.23PubMed Central. Hepatotoxicity of Herbal Supplements Mediated by Modulation of Cytochrome P450 Other commonly used herbs like echinacea, ginkgo, garlic, and milk thistle, at standard doses, do not appear to be strong disruptors of these enzymes.24PubMed Central. Cytochrome P450 enzyme mediated herbal drug interactions (Part 1)
Where Complementary Approaches Have Been Formally Adopted
Integrative oncology is the clearest example of complementary approaches being folded into mainstream clinical guidelines. The Society for Integrative Oncology and ASCO (the main oncology professional organization) have published evidence-based guidelines recommending specific approaches for cancer-related symptoms. For anxiety during active cancer treatment, they recommend mindfulness-based interventions, yoga, relaxation techniques, music therapy, reflexology, and aromatherapy by inhalation. For depression symptoms during treatment, the recommendations include mindfulness, yoga, music therapy, relaxation, and reflexology.25Journal of Clinical Oncology. Integrative Oncology Care of Symptoms of Anxiety and Depression in Adults With Cancer: Society for Integrative Oncology–ASCO Guideline
For cancer-related pain, acupuncture is recommended for joint pain caused by aromatase inhibitors (a common hormone therapy), while massage is recommended for pain in palliative care, and hypnosis for procedural pain like biopsies.26Journal of Clinical Oncology. Integrative Medicine for Pain Management in Oncology: Society for Integrative Oncology–ASCO Guideline These are not vague endorsements. They represent formal guideline panels reviewing hundreds of studies and deciding that the evidence clears the bar for specific conditions. The pattern is revealing: complementary approaches tend to earn their strongest endorsements when they address quality-of-life symptoms like pain, anxiety, fatigue, and mood, rather than the disease process itself.
The Placebo Question
Any honest discussion of complementary health approaches has to address placebo effects, and modern neuroscience has reframed what that phrase means. Placebo effects are not imaginary. They involve measurable changes in brain chemistry, including the release of opioids and dopamine, and they are shaped by learning, expectation, and social context.27PubMed Central. The neuroscience of placebo effects: connecting context, learning and health Expectations can be generated through verbal information (a provider telling you a treatment will help) or through conditioning (repeated experiences of a neutral cue paired with relief).28Translational Psychiatry. Placebo and nocebo effects: from observation to harnessing and clinical application
This matters for complementary health in two ways. First, some approaches may work partly or largely through these brain-mediated pathways. A healing ritual involving sustained attention, human touch, and a warm therapeutic relationship can activate real neurobiological processes relevant to pain and mood.29PubMed Central. Introduction to placebo effects in medicine: mechanisms and clinical implications Second, that does not make the benefit fake. If a patient’s pain decreases and their function improves, the clinical outcome is real regardless of whether the mechanism is specific to the therapy or arises from the therapeutic encounter itself. The tricky part is separating the two when evaluating whether a particular approach is worth recommending.
Acupuncture illustrates this tension well. Brain imaging studies in chronic pain patients have found that acupuncture alters functional connectivity in pain- and emotion-related brain regions, with the most consistent changes centered on the anterior cingulate cortex.30PubMed Central. Functional brain alterations associated with acupuncture for chronic pain: a scoping review of fMRI studies Whether those brain changes are specific to needle placement or partly driven by the ritual and expectation of treatment remains debated. But the fact that measurable brain changes occur at all has shifted the conversation from “does it do anything?” to “what exactly is it doing?”
Most People Do Not Tell Their Doctors
One of the most consistent findings across surveys is that people who use complementary approaches rarely mention it to their physicians. A meta-analysis of disclosure rates found that only about 33% of users of biologically based therapies (supplements, herbs) told their conventional provider.31Scientific Reports. Disclosure of complementary medicine use to medical providers: a systematic review and meta-analysis In an oncology-specific study, just under 24% of cancer patients had discussed or planned to discuss complementary approaches with their healthcare team.32PubMed Central. Barriers to communication about complementary and alternative medicine between oncology patients and healthcare professionals in Croatia: a cross-sectional study
The reasons are revealing. The most commonly cited barrier is that providers simply do not ask. In the oncology study, 70% of patients said the lack of initiative from their healthcare professional was the primary obstacle.33PubMed Central. Barriers to communication about complementary and alternative medicine between oncology patients and healthcare professionals in Croatia: a cross-sectional study Other reasons include fearing the doctor’s disapproval, assuming the doctor would not have relevant knowledge, believing the supplements are safe and would not interfere with treatment, and previous negative responses from providers.34Scientific Reports. Disclosure of complementary medicine use to medical providers: a systematic review and meta-analysis Research into patient communication patterns found that a doctor’s interpersonal skills, particularly listening attentively, being respectful, and taking time, were critical factors in whether patients felt comfortable disclosing.35PubMed Central. Patient’s Decision to Disclose the Use of Traditional and Complementary Medicine to Medical Doctor: A Descriptive Phenomenology Study
This nondisclosure creates a real safety gap, especially for herbal supplements that interact with prescription medications. If your doctor does not know you are taking St. John’s wort, they cannot warn you that it could undermine your other drugs. The fix is straightforward: bring a full list of everything you take, including supplements and herbs, to every medical appointment. If your provider does not ask, volunteer it.
Supplement Quality Is Not Guaranteed
In the United States, dietary supplements are regulated differently from prescription drugs. They do not need to prove safety or efficacy before going to market, and manufacturing oversight is less rigorous. Studies of supplement quality have found persistent problems with contamination, mislabeling, and undisclosed ingredients. Weight-loss and muscle-building supplements pose the greatest risk because they are more likely to be contaminated with banned or undeclared substances.36Sports Health: A Multidisciplinary Approach. Prohibited Contaminants in Dietary Supplements Third-party testing certifications (like USP, NSF, or ConsumerLab seals) can reduce but not eliminate this risk. If you use herbal or nutritional supplements, looking for one of these independent testing labels is the simplest way to improve your odds of getting what the label claims.
Music Therapy and Sensory Approaches
Music therapy stands apart from most complementary approaches because it combines a creative activity with structured clinical goals, and the evidence base is growing. In stroke rehabilitation, music-based interventions have been shown to help with swallowing problems, speech recovery, motor function, mood, and neurological recovery.37PubMed Central. Potential Benefits of Music Therapy on Stroke Rehabilitation One study of music-supported therapy in chronic stroke patients found measurable increases in motor cortex excitability in the affected hemisphere after 20 sessions, and the changes correlated with improved motor performance.38PLoS ONE. Sensorimotor Plasticity after Music-Supported Therapy in Chronic Stroke Patients Revealed by Transcranial Magnetic Stimulation That is a finding with genuine mechanistic weight: music therapy is not just making patients feel better, it is driving cortical reorganization.
Touch therapies, including Reiki and therapeutic touch, have generated more debate. A meta-analysis of touch therapies for cancer patients found that they effectively reduced pain, fatigue, anxiety, and negative mood after treatment, though they did not improve overall quality of life or stress levels.39Cancer Nursing. The Effect of Touch Therapy on Symptoms and Psychosocial Variables in Individuals Diagnosed With Cancer A randomized study of Reiki in cancer patients found it more effective than progressive relaxation exercises for reducing stress and that it had long-term benefits for pain and anxiety.40PubMed. The Effect of Reiki Applied to Cancer Patients on Pain, Anxiety, and Stress Levels: A Randomized Controlled Study These are symptom-management findings, not disease-modifying ones, and the placebo dynamics discussed earlier are likely at work. Still, for patients dealing with the burden of cancer treatment, measurable reductions in pain and anxiety are meaningful regardless of the mechanism.
The Gut-Brain Axis and Probiotics
Probiotics and prebiotics represent a newer frontier in complementary health, linked to growing research on the gut-brain axis. The basic idea is that the bacterial communities in your intestines communicate with your central nervous system through immune, hormonal, and neural pathways, and that manipulating those communities could affect mental health. Reviews of the evidence suggest that probiotics may help modulate this axis and have supportive effects on conditions like depression and anxiety, though the authors of these reviews consistently note that human clinical trials are still catching up to the animal data.41PubMed Central. The role of probiotics and prebiotics in modulating of the gut-brain axis Early human studies have shown that probiotic supplementation can shift gut bacteria composition toward more diverse communities and improve scores on mood assessments.42PubMed Central. Gut Biome and Mental Health: Do Probiotics Work? The science here is genuinely promising but still early. Specific strains, doses, and durations have not been standardized, and results vary between studies.
Economics of Complementary Care
A persistent question is whether integrating complementary approaches into healthcare saves or costs money. A systematic review of economic evaluations found that in about 29% of comparisons, complementary therapies both improved health and saved money compared with usual care.43PubMed Central. Are complementary therapies and integrative care cost-effective? A systematic review of economic evaluations That is not a universal win, but it suggests that for certain conditions and populations, these approaches are not just clinically worthwhile but economically justifiable. Some research has also found that insured users of complementary approaches had lower hospitalization costs and fewer outpatient visits than nonusers.44World Journal of Advanced Science and Technology. Integrating modern, alternative and complementary medicine: A holistic approach to better patient care and cost-effectiveness The causal direction is hard to pin down here, since people who seek out complementary care may differ from nonusers in health behaviors more broadly. But the evidence for cost savings in at least some clinical scenarios is real.
From Traditional Remedies to Modern Drugs
A significant portion of modern pharmaceuticals trace their origins to traditional plant-based remedies. Aspirin, morphine, and the malaria drug artemisinin all began as ethnobotanical knowledge before being isolated and characterized by modern chemistry.45PubMed Central. Bridging Ethnobotanical Knowledge and Multi-Omics Approaches for Plant-Derived Natural Product Discovery Recent large-scale analyses of traditional medicine systems have confirmed that this is not coincidence: plants that are closely related to known medicinal species tend to share similar chemical profiles and similar traditional uses across different cultures.46iScience. Modern drug discovery using ethnobotany: A large-scale cross-cultural analysis of traditional medicine reveals common therapeutic uses In other words, when multiple unrelated cultures independently arrive at the same plant for the same purpose, there is often a real chemical basis for it.
The process of turning traditional remedies into drugs has evolved. Historically, researchers started with a plant identified through ethnobotanical fieldwork, then worked backward to isolate the active compound through extensive testing. Today, computational methods can predict which compounds in a plant are likely to interact with which biological targets, then check whether existing ethnobotanical records align with those predictions.47PubMed Central. From Traditional Ethnopharmacology to Modern Natural Drug Discovery: A Methodology Discussion and Specific Examples This bidirectional relationship between traditional knowledge and pharmaceutical research is one reason to take ethnobotanical traditions seriously, even when any individual folk remedy lacks modern clinical evidence.
Virtual Reality and Digital Delivery
Technology is beginning to reshape how some complementary approaches are delivered. Virtual reality combined with biofeedback or guided meditation has been tested for pain management in conditions like rheumatic diseases. A pilot study found that both VR biofeedback and VR-guided meditation produced immediate reductions in pain scores with moderate effect sizes.48PubMed Central. Virtual Reality–Based Biofeedback and Guided Meditation in Rheumatology: A Pilot Study A broader scoping review found that VR-based biofeedback was at least as effective as traditional biofeedback for reducing anxiety, stress, and pain, with the added benefit of higher user motivation and engagement.49Applied Psychophysiology and Biofeedback. Virtual Reality Biofeedback in Health: A Scoping Review
The evidence is not uniformly positive, though. One study specifically testing whether respiratory biofeedback added value to VR meditation found that the biggest reduction in arousal occurred in the control condition that used no biofeedback at all.50PubMed Central. Respiratory Biofeedback Does Not Facilitate Lowering Arousal in Meditation Through Virtual Reality That finding is a useful reminder that novelty and technology do not automatically improve outcomes. The immersive, engaging quality of VR may itself be the active ingredient for some people, rather than any specific biofeedback signal. Research in this space is early but worth watching, particularly as VR headsets become cheaper and app-based meditation continues to expand.