**3. Antioxidants**

Under normal conditions, all organisms have enzymatic and non-enzymatic mechanisms capable of neutralizing pro-oxidants species and/or repair damages caused by reactive species, converting them to H2O, to prevent overproduction. Many antioxidants of low molecular weight such as vitamins and polyphenols are usually found in nutrients, although enzymatic neutralization of reactive species is the most effective mechanism (Agarwal et al., 2005; Fujii et al., 2005).
