Porphyrins are organic compounds characterized by a large, ring-like structure made up of carbon, nitrogen, and hydrogen atoms. They play a crucial role in various biological processes, particularly in the formation of hemoglobin, the protein in red blood cells that carries oxygen. Porphyrins are also involved in the function of chlorophyll, which is essential for photosynthesis in plants. These compounds can be found in many living organisms and are important for the synthesis of vital molecules. Abnormal levels of porphyrins can lead to medical conditions known as porphyrias, which can affect the skin or nervous system.