Effect of music at 432 Hz and 440 Hz on dental anxiety and salivary cortisol levels
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Randomized 42-patient trial: final anxiety both music arms lower than no music; baseline-adjusted final cortisol comparison 432 versus 440 Hz had p=0.99.
Qualifies
Several small human studies report short-term differences between 432 Hz and 440 Hz tuning conditions in autonomic, anxiety or sleep outcomes, supporting further study of narrow frequency-specific effects.
Challenges
The frequency-specific studies measure narrow short-term outcomes rather than disease cure, DNA repair or broad biological healing, so their endpoints do not establish the stronger viral claim.