4-Galloylquinic acid (4-GQA, CAS 110170-37-1) is a polyphenolic compound belonging to the class of hydrolyzable tannins. It is a specific ester formed between quinic acid and gallic acid, where the galloyl moiety is attached at the 4-position of the quinic acid core. This compound is a naturally occurring phytochemical found in various plants, notably in the leaves of *Liquidambar formosana* (Formosan sweet gum) and in certain herbal teas. Its primary significance lies in its potent biological activities, which are extensively studied in the context of natural product research and pharmacology. 4-Galloylquinic acid exhibits strong antioxidant properties by scavenging free radicals and chelating metal ions. It demonstrates notable anti-inflammatory effects by modulating key signaling pathways such as NF-κB and MAPK. Furthermore, research indicates potential hepatoprotective, neuroprotective, and anti-diabetic activities, making it a compound of interest for developing nutraceuticals and therapeutic agents. Due to its antioxidant capacity, it is also relevant in the food industry as a potential natural preservative or functional ingredient to enhance the stability and health profile of food products. Its isolation, characterization, and bioactivity assessment are central topics in phytochemistry and life science research.