<p>This paper develops a sustainable inventory model under eco-friendly demand by incorporating preservation strategies for sustainable growth. In recent years, consumer demand for environmentally responsible products has increased significantly due to growing awareness of the environmental impacts of purchasing decisions. This study proposes a novel green-oriented inventory framework that links product demand to the use of natural herbal components instead of synthetic chemical materials. The herbal products market continues to expand steadily, driven by consumers’ willingness to pay a premium for sustainable options that reduce carbon footprints. Moreover, advertising plays a crucial role in shaping product preferences, potentially increasing demand by up to 20%. Preservation efforts are essential for extending the products shelf life. Products are assumed to deteriorate gradually; however, targeted investments in preservation technology can effectively reduce the deterioration rate by 30–40%. The study aims to maximize total profit by jointly optimizing the selling price, preservation investment, carbon emission, and replenishment cycle length, achieving a 22% improvement in profit compared with conventional models. Numerical examples, graphical illustrations, and sensitivity analyses demonstrate the robustness of the proposed model and its superiority over traditional inventory approaches that overlook advertising and preservation effects, resulting enhanced profitability and environmental sustainability.</p>