A number of seaweed and seaweed-derived extracts have demonstrated superior antioxidant activity compared to terrestrial plants (Budhiyanti, Raharjo, Marseno, & Lelana, 2011). O'Sullivan et al. (2011) demonstrated that crude water-methanol prepared extracts
from a range of brown seaweeds exhibited in vitro antioxidant activity and DNA protective effects against H2O2-induced DNA damage in Caco-2 cells