The in vitro evidence for an effect of high homeopathic potencies--a systematic review of the literature.

OBJECTIVE: Systematic assessment of the in vitro research on high potency effects. METHOD: Publications of experiments were collected through databases, experts, previous reviews, citation tracking. INCLUSION CRITERIA: stepwise agitated dilutions <10(-23); cells or molecules from human or animal. Experiments were assessed with the modified SAPEH score. RESULTS: From 75 publications, 67 experiments (1/3 of them replications) were evaluated. Nearly 3/4 of them found a high potency effect, and 2/3 of those 18 that scored 6 points or more and controlled contamination. Nearly 3/4 of all replications were positive. Design and experimental models of the reviewed experiments were inhomogenous, most were performed on basophiles. CONCLUSIONS: Even experiments with a high methodological standard could demonstrate an effect of high potencies. No positive result was stable enough to be reproduced by all investigators. A general adoption of succussed controls, randomization and blinding would strengthen the evidence of future experiments.

Does potentized HgCl2 (Mercurius corrosivus) affect the activity of diastase and alpha-amylase?

BACKGROUND: Homeopathic drugs even with dilutions beyond 10(23) (high potencies) are frequently used, although their working mechanism is still unknown. Curative information preserved in solvent structure is postulated to exert biologic effects. OBJECTIVE: The objective was to test for a stimulating or inhibiting effect of high potencies of the homeopathic remedy HgCl2 (Mercurius corrosivus) on two sugar hydrolases. METHODS: High potencies were produced using stepwise dilution plus shaking. Controls included potentized solvent (aqua bidestillata), equimolar dilutions without shaking, and enzyme-free references. Tested were potencies with dilution factors 1:200 (CC) on diastase extract from winter barley, and 1:100 (C) on alpha-amylase from hog pancreas. Enzyme activity was colorimetrically determined by Lugol's iodine-starch reaction. RESULTS: An inhibiting effect of HgCl2 on enzyme activities was observed only in low potencies and dilutions. Statistically significant differences between potencies and controls were not found in randomized and blinded experiments. CONCLUSIONS: This experimental design provided independent reproducible results of cell-free in vitro assays. However, it did not indicate an effect of potentized HgCl2 on hydrolases. Demonstrating potency effects may require additional experimental features.

High homeopathic potencies are different from potentized solvent when investigated with the REDEM technology.

OBJECTIVE: To determine in a series of randomized blinded experiments using the REDEM technology whether differences between high homeopathic potencies and similarly potentized solvent can be detected. DESIGN AND ANALYSIS: A REDEM device was employed as a black box. Samples were measured in a capacitor that was connected to 60 individual oscillator circuits at frequencies between 250 and 930 KHz; their oscillation damping was recorded. In two experiments (3 and 4 replications) stable differences between a potentized 'mother tincture' and potentized solvent were assessed. Statistical analysis was done using ANCOVA. RESULTS: Significant differences (p < 0.01) between remedy and control were found, mostly at the same oscillator frequencies. Those differences found for only one remedy always were at frequencies adjacent to frequencies with differences for other remedies. VISUAL ANALYSIS: Where output curves were not near 0, remedy values were higher than controls. Curves within a replication ran parallel, their distances varied. Between replications, curve shapes and remedy- control differences were similar, however, control curves varied in height. Control and remedy curves between experiments varied in shape. Effects increased with time and sample conductivity. Ethanol 43% as solvent eliminated the observed effects, use of polyethylene containers considerably attenuated them. CONCLUSIONS: A probably physical difference was seen between potentized homeopathic remedies and potentized solvent. The differences are associated with sample age, solvent, and container material. The REDEM technology requires further investigation to determine the nature of the underlying mechanisms of the observed differences.

Quality assessment of physical research in homeopathy.

OBJECTIVES: To assess the evidence of published experiments on homeopathic preparations (potencies) that target physical properties (i.e., assumed structural changes in solvents). METHOD: A suitable instrument (the Score for Assessment of Physical Experiments on Homeopathy [SAPEH]) was developed through consensus procedure: a scale with 8 items covering 10 criteria, based on the 3 constructs, methodology, presentation, and experiment standardization. REVIEWED PUBLICATIONS: Written reports providing at least minimal details on physical experiments with methods to identify structural changes in solvents were collected. These reports were scored when they concerned agitated preparations in a dilution less than 10(-23), with no other restrictions. We found 44 publications that included 36 experiments (the identity of 2 was unclear). They were classified into 6 types (dielectric strength, 6; galvanic effects, 5; light absorption, 4; nuclear magnetic resonance [NMR], 18; Raman spectroscopy, 7; black boxes of undisclosed design, 4). RESULTS: Most publications were of low quality (SAPEH < 6), only 6 were of high quality (SAPEH > 7, including 2 points for adequate controls). These report 3 experiments (1 NMR, 2 black boxes), of which 2 claim specific features for homeopathic remedies, as does the only medium-quality experiment with sufficient controls. CONCLUSIONS: Most physical experiments of homeopathic preparations were performed with inadequate controls or had other serious flaws that prevented any meaningful conclusion. Except for those of high quality, all experiments should be repeated using stricter methodology and standardization before they are accepted as indications of special features of homeopathic potencies.

The role of trace elements in homeopathic preparations and the influence of container material, storage duration, and potentisation.

OBJECTIVE: To investigate trace elements in liquid homeopathic preparations and the influence of container material, storage duration, and potentisation. MATERIALS AND METHODS: Using inductively coupled plasma-mass spectroscopy (ICP-MS), we investigated (a) aqua bidestillata (ABD) stored for 12 h in either brown glass or high density polyethylene (HDPE) bottles; (b) ABD stored for 2 h in HDPE, the same additionally filled in brown glass bottle, and ABD potentised in brown glass up to C30; (c) -- at 3 different sample ages and with statistical analysis -- ABD C30 (brown glass), AgNO3 C30 (brown glass), and controls (unsuccussed, brown glass and HDPE). RESULTS: Contamination of the initial ABD increased and element concentrations changed far more when stored in brown glass bottles than in HDPE. Effects were strongest during initial storage time and during the first potentisation step from mother tincture to C1; subsequent potentising steps produced no relevant changes. Potencies of AgNO3 and potencies of water contained similar contamination. CONCLUSIONS: Potentising accelerates material exchange between container and solvent, mostly during succussion. Research on potentised preparations should use potentised controls with equal preparation and storage time. If physical and biological effects of potencies exist, contaminants might be one factor for their generation.