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High dilution effect assessed by UV-Spectroscopy

A team of researchers at the Swiss Institute of Complementary Medicine KIKOM in collaboration with two laboratories in the USA investigated homeopathic preparations with UV-spectroscopy.

In a blinded, randomized, controlled experiment homeopathic preparations of copper sulfate (CuSO4; 11C–30C), quartz (SiO2; 10C–30C, i.e. centesimal dilution steps) and sulfur (S; 11D–30D, i.e. decimal dilution steps) and controls (one-time succussed diluent) were investigated using UV-spectroscopy and tested for contamination by inductively coupled plasma mass spectrometry (ICP-MS).

The UV transmission for homeopathic preparations of CuSO4 preparations was significantly lower than in controls. The transmission seemed to be also lower for both SiO2 and S, but not significant. UV transmission values between homeopathic preparations had a significantly higher variability compared to controls.

Thus, experimental evidence accumulates that highly diluted homeopathic preparations, i.e. diluted beyond the Avogadro limit, exhibit particular physicochemical properties different from shaken pure solvent. The exact nature of these properties is not yet known; the current working hypothesis is an increase in the solvent’s molecular dynamics for homeopathic preparations. All high-quality experimental data obtained so far by several independent working groups for different homeopathic preparations, involving studies with high- and low-field 1H NMR relaxation time, 1H-NMR-spectroscopy, and thermodynamics are compatible with this ‘dynamization hypothesis’.

Wolf U, Wolf M, Heusser P, Thurneysen A, Baumgartner S (2009). "Homeopathic Preparations of Quartz, Sulfur and Copper Sulfate Assessed by UV-Spectroscopy," Evidence-Based Complementary and Alternative Medicine, doi:10.1093/ecam/nep036.
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