Clinical trial at kidney dialysis centres in Brazil, with positive findings, on 20 patients with moderate to severe itching of the skin. Approximately half of the patients were randomly allocated to receive homeopathy; the others received dummy medicine (placebo). They did not know which treatment group they were in. During a period of 2 months, the itching became less severe in the homeopathy group but not in the placebo group. More patients responded to treatment with homeopathy than to placebo, though the only statistically significant difference was at 1 month.