Used to measure the activity of human Thioredoxin Reductase (TrxR) in biological samples such as cell lysates, tissue extracts, or serum. This assay helps assess cellular redox status and oxidative stress levels, which are important in studying diseases like cancer, neurodegenerative disorders, and inflammatory conditions. The kit enables high-throughput screening in research settings, supporting drug development and evaluation of antioxidant therapies. It provides a reliable and sensitive method to monitor TrxR activity changes in response to experimental treatments or disease progression.