Sameena Sultan (2014) “Reviewing the Protective Role of Antioxidants in Oxidative Stress Caused by Free Radicals Oxygen is essential element for life. Oxidative properties of oxygen play a vital role in diverse biological phenomena. Oxygen has double-edged properties, being ess”, Asian Pacific Journal of Health Sciences, 1(4), pp. 401–406. doi: 10.21276/apjhs.2014.1.4.15.