The invention relates to a food additive including: 30 to 45% of eugenol； 30 to 45% of cinnamaldehyde； 10 to 40% of extract of a plant belonging to the alliaceous family； the remainder up to 100% optionally comprising other compounds, in particular, organosulphur compounds. Such an additive can be added to the feed for certain animals, in particular bovines, with a view to reducing the methane production thereof. The invention also relates to a method for reducing methane emissions into the earth's atmosphere, which includes the following steps: adding a food additive according to the invention to the food ration of a ruminant； and feeding the ruminant the obtained food ration.
