This study investigates the solubility and metal content analysis of eggshell flour treated with various methods, revealing significant findings. The highest solubility, reaching an impressive 91%, was observed in the HCl-treated sample, indicating efficient calcium extraction. In contrast, the distilled water-ESP treatment exhibited the lowest solubility at 1.5%, emphasizing the treatment's impact on enhancing solubility. Additionally, turbidity analysis revealed that the HCl-ESP treatment displayed the lowest turbidity at 20.66 NTU, suggesting improved solubility due to increased porosity. Furthermore, ICP-MS metal analysis indicated minimal presence of heavy metals in the treated samples, affirming their safety for diverse applications. The combination of enhanced solubility and low metal content highlights the potential of treated eggshell flour for eco-friendly and sustainable utilization, underscoring the importance of optimized treatment processes in enhancing its quality and safety for various industrial and environmental applications.