**Abstract**

Given the relevance of impairing reactive oxygen species (ROS) buildup in tissues, the use of exogenous antioxidants is highly regarded as a valid prophylaxis against oxidative stress and its deleterious effects on organisms. In this regard, *Camelia sinensis* uses as a remarkable antioxidant source have been reported in various folk and standard medicine systems around the world. In this chapter, the thermodynamics and kinetics of *Camelia sinensis* constituents is concisely discussed focusing on the implications of its redox profiling toward antioxidant capacity. Notwithstanding, the biological repercussion of ROS reduction as well as its therapeutic potential is also addressed to provide readers a basic background on the relevance of investigating the physicochemical features of medicinal plants.

**Keywords:** redox, black tea, electrochemistry, free radicals, reactive oxygen species
