Conversion of a substance into other compounds by organisms; including biodegradation. Biotransformation works by altering the a certain chemical and transforming it into another kind through chemical reactions within the body. Biotransformation utilizes the process of metabolism on a frequent basis. Regardless, the transformation does not specifically use metabolism each time for its process and may incorporate other sorts of toxicokinetics. Biotransformation is an important source for the survival of the human body for the purposes of taking in nutrients such as oxygen and foods into substances needed for the body to function. For some pharmaceuticals, it is a metabolite that is therapeutic and not the absorbed drug.