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What are complementary mental health therapies?
When you’re exploring ways to support your mental health, you’ve likely come across terms like “complementary” and “alternative” therapies. These words often get used interchangeably, but they mean very different things, and understanding the distinction matters for your care.
Complementary therapies are treatments you use alongside conventional mental health care, not instead of it. Think of them as additions to your existing treatment plan. You might work with a therapist while also practicing yoga, or continue taking prescribed medication while adding acupuncture to your routine. The key word is “with.”
Alternative therapies, by contrast, are used in place of conventional treatment. According to the NHS guidance on complementary and alternative medicine, this distinction shapes how safely and effectively these approaches can support your mental health.
Complementary and alternative healthcare spans a wide spectrum of practices, generally falling into three categories:
- Mind-body practices: Techniques like meditation, mindfulness-based stress reduction, yoga, and tai chi that use the connection between mental and physical states
- Natural products: Herbal supplements, vitamins, and other substances derived from natural sources
- Lifestyle interventions: Structured approaches to exercise, nutrition, sleep, and social connection that target mental health outcomes
Not all complementary therapies have equal research support, and some popular approaches have surprisingly little science behind them. The sections below examine each category through an evidence-based lens, helping you make informed decisions about which practices might genuinely enhance your mental health treatment.
How to evaluate research quality: understanding what “evidence-based” really means
When exploring complementary and alternative healthcare, the question of whether something is evidence-based sounds simple, but the answer depends entirely on how you define “evidence.” Not all research carries equal weight, and understanding the difference helps you make informed decisions about which therapies deserve your attention.
The hierarchy of evidence
Think of research quality like a ladder. At the bottom rung, you’ll find case studies: detailed reports about one person’s experience. These can generate interesting hypotheses, but they can’t prove a treatment works for most people.
Climb higher and you reach observational studies, where researchers watch what happens without controlling variables. These reveal patterns but struggle to prove cause and effect. Maybe people who try yoga also eat better, exercise more, and have stronger social support. Which factor actually helped?
Randomized controlled trials (RCTs) sit near the top. Participants are randomly assigned to receive either the treatment or a comparison condition, which helps isolate what’s actually causing improvement. At the very top are meta-analyses, which combine data from multiple RCTs to identify consistent patterns across different research teams and populations.
Understanding effect sizes
When a study reports that something “works,” you need to ask: how well? Effect sizes answer this question using standardized measurements. Cohen’s d is one common measure:
- Small effect (0.2): The treatment helps, but you might not notice the difference day to day
- Medium effect (0.5): A noticeable, meaningful improvement most people would recognize
- Large effect (0.8): A substantial change that significantly impacts daily life
For context, many established antidepressants show effect sizes around 0.3 to 0.5 for depression symptoms.
Why control groups matter
The comparison group in a study dramatically affects results. Waitlist controls, where people simply wait for treatment, tend to inflate effect sizes because participants aren’t receiving any attention or expectation of improvement. Active controls, where the comparison group receives some form of engagement, provide much stricter tests. Treatment-as-usual comparisons show whether adding something new beats standard care alone.
The problem with missing studies
Studies showing positive results get published more often than those showing no effect. This publication bias means the research you can find may overestimate how well treatments actually work. Negative studies matter because they provide the complete picture.
The rating system used below
Each therapy in this article receives a letter grade:
- A: Strong evidence from multiple high-quality RCTs with replication across research teams
- B: Moderate evidence from several RCTs, though some limitations exist
- C: Preliminary evidence from limited or lower-quality studies
- D: Insufficient evidence or studies showing no benefit over placebo
Mind-body practices: mindfulness, meditation, and yoga
Mind-body practices represent some of the most thoroughly researched complementary therapies available today. These approaches share a common thread: they use physical techniques to influence mental states, creating a holistic approach to anxiety, depression, and stress. The evidence base for several of these practices has grown strong enough that many therapists now incorporate them into treatment plans.
Mindfulness-Based Stress Reduction (MBSR)
MBSR was developed at the University of Massachusetts Medical School in 1979 and has since become one of the most studied complementary interventions in mental health. The standard protocol involves eight weekly group sessions lasting 2.5 hours each, plus a full-day retreat. Participants also commit to 45 minutes of daily home practice, which includes body scans, sitting meditation, and gentle movement.
This structured format matters for outcomes. A systematic review of mindfulness-based interventions for anxiety disorders found moderate effect sizes (d=0.5–0.6) for both anxiety and depression symptoms. These numbers translate to meaningful real-world improvements for most participants. The group format likely adds social support benefits that individual practice alone cannot replicate.
The time commitment can feel daunting at first, but the intensive structure appears necessary for building lasting skills. Shorter programs and meditation apps show mixed results, with brief daily practices producing smaller effects than the full eight-week curriculum.
Mindfulness-Based Cognitive Therapy (MBCT)
MBCT combines mindfulness training with elements of cognitive behavioral therapy to target a specific problem: preventing depression from returning. Researchers developed this approach after noticing that people with three or more depressive episodes faced high relapse rates even after successful treatment.
The program follows a similar eight-week group format to MBSR but focuses specifically on recognizing early warning signs of depression and responding differently to negative thought patterns. Rather than trying to change thoughts directly, MBCT teaches participants to observe them without getting pulled into rumination spirals.
The evidence for relapse prevention is compelling. Studies show MBCT reduces the risk of depression returning by 31–43% in people with recurrent depression, making it one of the most effective maintenance strategies available. Some research suggests it works as well as staying on antidepressant medication for preventing relapse.
Yoga and breathwork practices
Yoga encompasses many different styles, and the research suggests not all are equally effective for mental health. The strongest evidence exists for practices that emphasize breathwork, or pranayama, alongside physical postures. A meta-analysis examining yoga for anxiety found an effect size of 0.77, which is considered a moderate to large effect in clinical research.
The minimum effective dose appears to be two to three sessions weekly for at least eight weeks. Styles like Hatha yoga, Iyengar, and restorative yoga have the most research support. Hot yoga and more athletic vinyasa styles have less evidence specifically for mental health benefits, though they may still help some people.
Breathwork practices on their own are gaining research attention. Slow, controlled breathing activates the parasympathetic nervous system, which helps calm the body’s stress response. Some studies show benefits from as little as 10–15 minutes of structured breathing exercises daily, though more research is needed to establish optimal protocols.
One practical advantage of yoga: once you learn the basics, home practice becomes possible. This makes it more accessible than group-based programs for people with scheduling constraints or who live in areas without trained MBSR or MBCT instructors.
Exercise and physical activity for mental health
Among complementary treatments for anxiety and depression, exercise stands out for having one of the strongest research foundations. Decades of clinical trials have consistently shown that physical activity produces meaningful improvements in mental health symptoms, sometimes rivaling the effects of first-line treatments.
What the research shows
Meta-analyses examining exercise for depression have found large effect sizes ranging from 0.8 to 1.1, comparable to what researchers see with antidepressant medications in mild to moderate cases. A comprehensive review of exercise, yoga, and meditation confirms that physical activity offers robust benefits as a complementary approach to treating mental health conditions.
For anxiety, the evidence supports both aerobic and resistance training. One encouraging finding: people often experience acute anxiety reduction after just a single exercise session. This immediate relief can help build motivation for maintaining a regular routine.
Effective exercise protocols
Research points to specific protocols that produce results. The CDC’s physical activity guidelines recommend 150 minutes per week of moderate-intensity aerobic exercise, or 75 minutes of vigorous activity. Following these protocols, most people begin noticing improvements in mood and anxiety symptoms within four to eight weeks.
Resistance training is emerging as another effective option. Studies show that two to three strength training sessions weekly produce moderate antidepressant effects, and these benefits appear independent of aerobic exercise. Combining both types of activity may offer additive benefits.
How exercise affects the brain
Several biological pathways explain why movement helps mental health. Exercise promotes neurogenesis, the growth of new brain cells, particularly in regions involved in mood regulation. Physical activity also reduces inflammation throughout the body, a factor increasingly linked to depression.
Regular exercise helps regulate the HPA axis, your body’s central stress response system. When this system functions well, you recover more quickly from stressful events. There’s also a behavioral component: exercise naturally increases engagement with the world, countering the withdrawal that often accompanies depression and anxiety.
Natural products and supplements: what the evidence shows
When exploring complementary therapies for mental health, supplements often come up in conversation. The research here is genuinely mixed. Some natural products have meaningful evidence behind them, while others rely more on marketing than science.
One critical point applies across all supplements: the industry remains largely unregulated. Unlike prescription medications, supplements don’t require proof of effectiveness or even accurate labeling before reaching store shelves. Look for products tested by third-party organizations like USP (United States Pharmacopeia) or NSF International, which verify that what’s on the label matches what’s in the bottle.
Omega-3 fatty acids
Omega-3s, particularly EPA (eicosapentaenoic acid), have the strongest supplement evidence for depression. Formulations that are EPA-dominant consistently perform better in clinical trials. The effective dosage range from positive studies falls between 1 and 2 grams of EPA daily.
The effects are small to moderate, not dramatic. According to the Royal College of Psychiatrists’ review of complementary therapies, omega-3s show the most promise when used alongside other treatments rather than alone. For anxiety disorders, the evidence is considerably weaker and less consistent.
SAMe and folate
SAMe (S-adenosyl-L-methionine) is a naturally occurring compound involved in neurotransmitter production. At doses of 800 to 1,600 mg daily, some trials have found antidepressant effects comparable to older tricyclic antidepressants. Study quality varies significantly, and SAMe can be expensive.
Folate, specifically the active form L-methylfolate, works differently. The best evidence supports using it as an add-on to antidepressants rather than a standalone treatment. Positive trials typically used 15 mg of L-methylfolate daily. People with certain genetic variations affecting folate metabolism may benefit most.
Herbal supplements and vitamins
St. John’s Wort has genuine evidence for mild to moderate depression, with some studies showing effects similar to standard antidepressants. The concern isn’t effectiveness but safety. This herb interacts with numerous medications, including birth control pills, blood thinners, and many antidepressants. These interactions can be serious, making St. John’s Wort impractical for many people who might otherwise benefit.