Frequency myths: was 432 Hz banned, is 528 Hz harmful?
Was 432 Hz banned?
No. The widely used A4 = 440 Hz tuning is an international standard (ISO 16); it is not a law but a reference point that musicians and instrument makers agree on. Music tuned to 432 Hz is freely made and played.
A story that 440 Hz was imposed by a political regime to unsettle people circulates widely online; there is no reliable historical source supporting it.
Is 528 Hz harmful?
There is no finding that a tone played at a comfortable level is harmful because of its frequency. The restorative or romantic meanings attached to 528 Hz have not been shown either; the stress-measure differences reported in small studies are weak evidence. Listening loudly for a long time strains hearing whatever the frequency.
How long should I listen?
There is no evidence-based "dose" for a frequency. The general rules of safe listening apply: keep the volume low, take breaks during long headphone sessions, and stop if you notice ringing in the ears or discomfort.
Is there a special frequency for health?
No specific frequency has been shown to help with any illness. Solfeggio and similar lists are spiritual interpretations that spread in the late 20th century. Frekans Studio offers these lists with a ✦ T (traditional) label, for curiosity and listening practice.
What does the evidence say?
There are small, inconsistent preliminary findings; we offer 432 Hz as a tuning preference.
▲ C · Preliminary/mixed evidence- What do we know?
- Small studies reported a borderline drop in heart rate with 432 Hz (33 people) and, in cancer patients with a live monochord, slightly larger drops in heart rate and pulse-wave velocity than with 443 Hz (43 people). In a trial with 162 students in Türkiye, 432 Hz music raised one salivary biomarker (GRP78), which is not a measure of calm.
- What don't we know?
- Results are inconsistent: in emergency staff, anxiety also fell without music and groups were not compared with each other; in kickboxers, 440 Hz music was linked to better performance than 432 Hz; in students, attention-test scores did not differ between groups. Studies are small and mostly pilots.
There is one small study and one biomarker trial; it has not been reliably shown that 528 Hz reduces stress.
■ D · Insufficient evidence- What do we know?
- In a small 9-person study, salivary cortisol fell and tension scores decreased after 528 Hz music; randomization and blinding were not reported. In a randomized trial with 162 students in Türkiye, 528 Hz music raised salivary BDNF and CREB.
- What don't we know?
- What these biomarker changes mean for everyday stress is unclear; attention-test performance did not differ between groups in the same trial. The findings have not been independently replicated.
A modern spiritual interpretation; not a scientific claim.
✦ T · Traditional/spiritual practice- What do we know?
- Medieval solfège syllables (ut, re, mi…) are real music history. Today's list assigning Hz values to them is a modern spiritual interpretation, popularized by a non-peer-reviewed book published in 1999. Lists vary between sources: some count six tones, others nine.
- What don't we know?
- The meanings given to the tones have not been scientifically tested, and different sources assign different meanings.
Evidence levels and sources come from the database; the article adds no new claims. Evidence methodology
Frequently asked questions
- Is frequency music harmful?
- At a comfortable level the frequency itself causes no known harm. What matters is volume, duration, and not listening to drowsy-making sounds while driving.
- Why are there so many frequency videos?
- Frequency names are easy to search for and long videos are easy to make. That does not make the claims true; it is worth checking the evidence level of each claim.
Listen and try
Last updated: 3 October 2026 · This article is for information only; it is not medical advice.