It is an antioxidant like vitamin E and it is used in biological or biochemical applications to reduce oxidative stress or damage.

[1] The TEAC assay is used to measure antioxidant capacity of foods, beverages and supplements.

Ferric reducing ability of plasma (FRAP) is an antioxidant capacity assays which uses Trolox as a standard.

Oxygen radical absorbance capacity (ORAC) used to be an alternative measurement, but the United States Department of Agriculture (USDA) withdrew these ratings in 2012 as biologically invalid, stating that "The data for antioxidant capacity of foods generated by in vitro (test-tube) methods cannot be extrapolated to in vivo (human) effects and the clinical trials to test benefits of dietary antioxidants have produced mixed results.

We know now that antioxidant molecules in food have a wide range of functions, many of which are unrelated to the ability to absorb free radicals" [2]