Metabolites are the intermediates and products of metabolism. The term metabolite's usually restricted to small molecules. A primary metabolite's directly involved in normal growth, development, and reproduction. A secondary metabolite isn't directly involved in those processes, but usually has an important ecological function. Examples include antibiotics and pigments. The metabolome forms a large network of metabolic reactions, where outputs from one enzymatic chemical reaction are inputs to o… (More on Metabolite)