Generally, these agents have the ability to oxidize proteins, lipids, and nucleic acids and produce hazardous byproducts. These byproducts can cause cellular damage, such as changes in membrane structure, damage to organelles, damage to DNA, and dysfunction of cells, in addition to a number of serious illnesses (e.g., diabetes, hypertension, gouty inflammation, dyslipidemia, atherosclerosis, etc.). 4,[8][9][10] Previous reports have demonstrated that gout is associated with comorbidities such as hypertension, renal disease, diabetes mellitus, metabolic syndrome, hyperlipidemia and atherosclerosis, cancer, and aging. 2,11 Therefore, antioxidant therapy using bioactive compounds that inhibit XO activity is frequently suggested as an effective method to prevent gout complications and related ailments. Xanthine oxidase inhibitors (XOIs) e.g., allopurinol, topiroxostat, febuxostat, and pyranostat are a class of medications used for lowering uric acid level in the management of gout. 12,13 Allopurinol, introduced in 1966, is the most commonly used drug to lower urate levels in serum and urine. 14 It has been shown to be effective in reducing flares and tophi as urate levels decrease, reducing cardiovascular mortality, the risk of developing chronic kidney disease, the risk of prostate cancer, [15][16][17] as well as anti-inflammatory, and analgesic effects. 12 However, due to the long-term treatment, allopurinol may lead to many adverse effects including gastrointestinal bleeding, renal toxicity, 5,18 hypersensitivity syndrome and rashes, 13 toxic epidermal necrolysis syndrome, and liver function abnormalities. 5 Therefore, the search for new XO inhibitors, especially natural compounds, is still necessary. Studies have reported that bioactive compounds such as polyphenols (e.g., flavonoids, tannins, and coumarins), saponins, terpenoids, and alkaloids showed uric acid-lowering effects and were effective in inhibiting XO. 19,20 Furthermore, these compounds may also contribute to the improvement of gout by impeding oxidative stress. 20 The genus Vitis L. (belonging to the family Vitaceae) contains 81 accepted species, 21 and they are well known for their many uses in