[ISO 14021](https://www.iso.org/standard/66652.html) (self-declarations, Type II): scientific justification, verifiability and transparent assumptions. For a product, aim for a sector-specific PEF where one exists. For corporate communications, the ADEME-CNC guide provides the standard used by the DGCCRF.
Read the source article: EmpCo and Green Claims: EU 2024/825 rules explained in 2026