Chlorophyll b is an orally active tetrapyrrole derivative and pigment that can be obtained from photosynthetic organisms such as plants and algae. It acts as a hydrogen donor and enhances glutathione levels. Chlorophyll b possesses antioxidant activity and functionally replaces chlorophyll a in photosystem II to participate in photosynthesis. It reduces DNA damage, chromosome instability, and oxidative stress induced by Cisplatin (HY-17394). Chlorophyll b is primarily used in research on plant photosynthesis mechanisms.