The Short Version
This claim restates a core homeopathic doctrine as established fact, but it is not supported by the weight of scientific evidence. Major health agencies (NCCIH) and multiple high-quality systematic reviews consistently find no reliable evidence that homeopathic remedies work better than placebo. The proposed mechanism — that water retains a "memory" of substances diluted beyond any molecular trace — has not been reproducibly demonstrated. Some pro-homeopathy research actually contradicts the claim's own premise by finding nanoparticle residues persist at high dilutions.