Tetrapyrolles are the foundation of life on this planet and allow us to eat sunlight!

From Cyanobacteria (and later plants) who evolved in order to use them to create chlorophyll and capture photons and use that energy to turn CO2 into reduced carbon chains which form sugar/fat and O2, to mammalian cells (among others) who use them to create hemoglobin(from heme) which then carries the O2 to the mitochondria where we oxidise these reduced carbon chains back to CO2 and energy in the form of ATP.

The breakdown products of both heme and chlorophyll are anti inflammatory/anti oxidative in nature, and have roles to play in aging too.