Nanomaterials are being used to improve the performance of a rapidly-growing number of products. In businesses that produce or commercialize nanoparticles, nanomaterials, and/or nanoproducts, professionals (along with product stewards and others) have the opportunity to apply relevant science and skills to anticipate, recognize, evaluate, and manage potential risks associated with nano products throughout the product life cycle. This guidance addresses stewardship for nanomaterials and their uses in products.