Abstract: This invention is related to the obtainment of a new active ingredient and its obtaining process from green or ripe fruits of both Acrocomia crispa and Acrocomia aculeata species of the Arecaceae family. Such active ingredient can be used as nutritional supplement, cosmetic-therapeutic formulations, or as pharmaceutical compositions for preventing and/or treating inflammatory processes and oxidative stress, and includes a mixture of fatty acids from 6 to 28 carbon atoms (free and/or as acylglycerols or ethyl esters), mainly those saturated of linear chain with 8, 10, 12, 14, 16 and 18 carbon atoms, and those unsaturated of 16 and 18 carbon atoms, and that may also contain sterols and fatty alcohols.