"Breakdown products" refers to the substances or elements that are produced when a larger or more complex material breaks down or decomposes. Full definition
The defect prevents the body from eliminating ammonia, a toxic breakdown product of protein metabolism. (scientificamerican.com)
For example, women who had their feelings out and supported one another had very little stress breakdown products in their urine and did not have any heart disease. (health.com)
Emergency workers were exposed to unprecedented levels of these chemicals and breakdown products during the rescue and clean up efforts. (hawaiinaturopathicretreat.com)