a chemical structure made up of four smaller rings, occurs in the chlorophyll of plants, the hemoglobin of blood and many enzymes which, like hemoglobin, take part in respiration ...

Hemoglobin also contains iron ... This mixture causes the structure of chlorophyll to change, and you’re left with chlorophyllin, a water-soluble derivative that is thought to be more bioavailable.

Porphyrin chemistry is a fascinating field that explores the structure ... such as in hemoglobin and chlorophyll. Recent research has expanded our understanding of porphyrin derivatives ...