DESCRIZIONE
The invention is directed to an animal feed or a human food product for improving barrier properties of the intestinal mucosa. In a first aspect, this object is met by providing an animal feed suitable for feeding mammals, birds and fish, or a food for human consumption comprising a C5 acid compound, wherein the dosage of said C5 acid compound in said animal feed is 0.025% or higher by weight, based on the total weight of said animal feed.