Nanomaterials are chemical substances or materials that are manufactured and used at a very small scale . In cosmetic products, 'nanomaterial' refers to an insoluble or biopersistent and intentionally manufactured material. A nanomaterial has one or more external dimensions, or an internal structure, on the scale from 1 to 100 nm. EU legislation provides a high level of protection of human health where nanomaterials are used in cosmetic products.
