A Systematic Review of Therapeutic Synergy: Integrating Solfeggio 417 Hz Frequency and Dance Movement Therapy for Mental Health

Background : Mental health disorders are increasing globally, prompting the exploration of innovative non-pharmacological interventions. Solfeggio frequency 417 Hz and dance movement therapy show promising therapeutic potential, but their integrative synergy has not been systematically evaluated. Objective : To evaluate the effectiveness of Solfeggio frequency 417 Hz, dance movement therapy, and integrative approaches in improving mental health through a systematic review. Methods : The systematic review was conducted following the PRISMA 2020 protocol. A comprehensive search was conducted in PubMed, Scopus, Embase, PsycINFO, Cochrane Library, and Web of Science databases for studies published between 2020 and 2025. Inclusion criteria included studies in adult populations with mental health disorders, interventions with 417 Hz frequency or dance movement therapy, and validated mental health outcomes. Quality assessment used the Cochrane Risk of Bias tool and the JBI Critical Appraisal Checklist. Results : Of 3,003 articles identified, 36 studies met the inclusion criteria (n=5,247 participants). The 417 Hz frequency intervention demonstrated moderate effect sizes for reducing depression (d=0.62-0.74) and anxiety (d=0.45-0.68). Dance movement therapy was effective for depression (d=0.55-0.72), anxiety (d=0.58-0.61), and stress (d=0.55). The integrative approach demonstrated the largest effect size (d=0.84-0.93) with consistent synergistic benefits. Conclusion : Evidence shows promising effectiveness for all three modalities, with the integrative approach providing superior outcomes. Further research is needed to optimize protocols and understand the neurobiological mechanisms underlying this therapeutic synergy.