Two products based on HT were used in the present study. The
first, HT produced by chemical and enzymatic synthesis with ana-
lytical purity (>99%) (Seprox Biotech, Spain), hereinafter called as
HTB. It is Generally Recognized as Safe (GRAS). The second one
was a natural extract from olive byproducts, with a richness of
26% hydroxytyrosol (HytoliveÒ, Genosa I + D, Spain), hereinafter
referred as HTG.