The present invention includes a nutritional supplement composition that may be used for livestock and the like, as well as to a livestock feed mixture containing same. Also included are methods of preparing the nutritional supplement composition, the livestock feed mixture, as well as methods of providing nutrition to livestock and the like. The livestock feed composition comprises: (a) a solid particulate livestock feed material and (b) a solidified particulate mixture of (i) free fatty acid and (ii) a magnesium salt of a fatty acid, the magnesium salt of a fatty acid being present in an amount in the range of from about 25% to about 55% of the amount of the free fatty acid based upon the theoretical requirement to accomplish the total neutralization of all of fatty acid present.
