Creatinine is a product of metabolism of creatine phosphate, a molecule that serves as a rapidly mobilizable reserve of a brain and skeletal muscle. Creatinine is excreted by kidneys with little or no reabsorption. Serum creatinine is the most commonly used indicator of renal function.

Monoethanolamine is both a primary amine and a primary alcohol. It is an olamine derivative. Monoethanolamine occurs in every cell in the human body as the head group of Phosphatidylethanolamine. Monoethanolamine is a component of glycosylphosphatidylinositol-anchored proteins, which are essential for viability. Other sources of monoethanolamine or phosphoethanolamine in the human body are the degradation of sphingosine phosphate by sphingosine phosphate lyase and the degradation of the endocannabinoid anandamide by the fatty acid amine hydrolase. Monoethanolamine stimulates the rapid growth of mammalian cells in culture. Monoethanolamine has a cardioprotective role against ischemia/reperfusion injury via activation of the transcription factor STAT-3. Monoethanolamine is a chemical intermediate in the manufacture of cosmetics, surface-active agents, emulsifiers, pharmaceuticals, and plasticizing agents.