Changes in Indonesian consumer consumption patterns, previously focused solely on price and function, now consider environmental sustainability aspects. This encourages companies to develop eco-friendly products to meet consumer needs. However, the growing sustainable investment trend has introduced risks, including greenwashing practices by FMCG companies. Greenwashing harms not only consumers but also the environment and the companies themselves. This research uses a normative juridical method with statutory and conceptual approaches. Findings indicate that FMCG companies engage in greenwashing when claiming environmental friendliness on packaging labels without substantiation or committing one of the seven greenwashing sins. Thus, more comprehensive and specific regulations are needed, based on Lon Fuller's eight principles of legal certainty, to provide legal certainty regarding greenwashing practices and better protect consumers and the environment.
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