Influencers on social media have become strong voices that have the ability to affect the attitudes, views, and purchasing decisions of consumers. Influencers in the sustainability space are increasingly promoting eco-friendly lifestyles, the advantages of green products, and environmental responsibility, which raises concerns about how they may affect consumer behavior. This study looks at how consumer adoption of sustainable products is impacted by influencer traits like reputation, authenticity, knowledge, and message engagement. The study examines how influencer-led sustainability messaging affect attitudes, perceived norms, trust, and intentions to make green purchases using the Theory of Planned Behavior and Source Credibility Theory. A quantitative research design was adopted, and Information was gathered from users of social media who follow sustainability-focused influencers on Instagram and YouTube. Findings indicate that influencer authenticity and message credibility significantly enhance trust, which in turn positively impacts attitudes and intentions toward sustainable product adoption. The study contributes to sustainable marketing literature by identifying the behavioral mechanisms driving consumer responses to influencer-led sustainability communication. Practical implications and recommendations for marketers are also discussed.