Microbiome pages address the subset of microbiome biology for which heavy-metal exposure is the primary mechanistic link. Pages are written so that they can be lifted to WikiBiome with minimal editing; broader microbiome medicine, including clinical metallomics outside the food and supply-chain context, is covered at WikiBiome rather than here. Each page covers the mechanism of action, taxon-level effects at genus or species resolution where the source supports it, functional and metabolic consequences, the evidence base separating human from animal studies, and disease-process implications.