Isoquercitrin is a naturally occurring flavonoid glycoside, specifically the 3-O-glucoside of quercetin, found in various plants such as onions, apples, tea, and St. John's wort. It is a yellow crystalline powder with potent antioxidant properties, acting as a free radical scavenger to protect cells from oxidative damage. Chemically, it consists of a quercetin aglycone linked to a glucose moiety, enhancing its water solubility compared to quercetin alone. Isoquercitrin plays a significant role in food chemistry as a bioactive compound, contributing to the health benefits of fruits and vegetables, including anti-inflammatory, antiviral, and cardioprotective effects. Studies from peer-reviewed sources, such as those in the Journal of Agricultural and Food Chemistry, indicate it may help in managing diabetes by inhibiting enzymes like α-glucosidase and improving insulin sensitivity. Its stability in aqueous environments makes it suitable for functional foods and supplements. Environmentally, it is derived from renewable plant sources. With a molecular structure that includes hydroxyl groups, it forms hydrogen bonds, influencing its interactions in biological systems. Research highlights its potential in preventing neurodegenerative diseases and cancer due to its ability to modulate signaling pathways. Overall, isoquercitrin is valued in nutraceuticals for its bioavailability and safety profile, though further clinical trials are needed to fully elucidate its therapeutic applications.