432 Hz is one of Barbara Hero's elemental tones, associated with potassium and, in her system, with the pineal. It happens to share its number with the well-known A = 432 tuning movement, though that is a separate idea about concert pitch. As with all of Hero's mineral tones, the element–gland–pitch pairing is her own contemplative framework, offered for listening. Barbara Hero built her work on the Pythagorean Lambdoma, a matrix of whole-number ratios she rendered as sound on a custom harmonic keyboard. Among her explorations was a set of tones linked to individual elements (sulfur, iron, copper, iodine) and paired, in her correspondence system, with endocrine glands. The mappings are her own contemplative framework, not chemistry or physiology. Independent of any tradition, controlled clinical evidence that a specific frequency produces a specific health effect is limited and mixed. Auriviel presents these tunings as music and contemplative practice. This page is for general information and relaxation. Auriviel's frequency music is not medical advice, diagnosis, or treatment, and no health outcome is claimed. If you have a medical concern, please consult a qualified professional.