Music tuned to 432 Hz versus 440 Hz for improving sleep in patients with spinal cord injuries
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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.