Phenolic compounds have emerged as important indicators of salt stress in plants. These diverse molecules, numbering around 9,000, play crucial roles in plant defense, particularly in neutralizing ROS generated during stress conditions [85]. Salt stress dis­rupts photosynthetic processes, leading to increased ROS production and oxidative damage. In response, plants synthesize various phenolic compounds, including phenolic acids, flavonoids, and proanthocyanidins, which act as antioxidants [85]. Research on crop plants consistently shows elevated phenolic content under saline conditions. For example, spearmint and Achillea fragratissima exhibit higher levels of phenolic acids and tannins when exposed to salt stress. Matricaria chamomilla demonstrates increased production of specific phenolic acids like protocatechuic, chlorogenic, and caffeic acids. Similarly, Nigella sativa and Mentha pulegium show a positive correlation between phe­nolic accumulation and salinity levels [86]. In Nigella, cultivated in saline soils, com­pounds such as quercetin, apigenin, and trans-cinnamic acid are found in higher con­centrations, illustrating the plant’s adaptive response to salt stress through enhanced phenolic synthesis.