The composition of amino acids in beans depends on the total protein content and the ratio of various proteins. Lysine levels are intermediate between soybean meal and grains, which is essential nutrition for non-ruminants, but beans do not contain enough of the amino acids sulfur or tryptophan.

Starch is the most abundant component of beans, about 500 g/kg, and is a valuable source of energy for livestock. The average oil content is low (less than 2%). The composition of this oil is similar to that of grain crops, mainly triglycerides, polyunsaturated in nature with a predominance of linoleic acid.