Used to measure the concentration of oligomeric proanthocyanidins (OPCs) in various samples, this assay kit is widely applied in research and quality control. It is particularly useful in the food and beverage industry for analyzing OPC levels in products like wine, tea, and fruit extracts, ensuring consistency and health claims. In the pharmaceutical and nutraceutical sectors, it helps in standardizing herbal extracts and supplements that contain OPCs for their antioxidant properties. Additionally, the kit is employed in academic and clinical studies to investigate the biological effects of OPCs, such as their role in cardiovascular health, skin protection, and anti-inflammatory activities. Its accuracy and ease of use make it a valuable tool for quantifying OPCs in diverse applications.