Metabolites are compounds found inside of cells.  Metabolites regulate the rate of metabolism by controlling the interaction of enzymes upon the cell.  Metabolism is a series of chemical reactions that takes place in cells and is the basic function of life.  A metabolite retains most if not all of the properties of its parent compound until it  carbon structure blends into larger structures or is reduced to smaller structures. Examples of the former include amino acids that appear in proteins, glucose molecules that appear in glycogen, fatty acids that appear in membrane lipids, or nucleotides that appear in DNA. Smaller metabolites are created when a parent compound is subject to systematic dismemberment as, for example, during oxidation reactions where the carbon appears in smaller size molecules and ultimately as carbon dioxide. These are examples where a metabolite is either a building block of a larger structure or a degradative product destined for excretion.