Where do organosulfur compounds occur in nature?

Organosulfur compounds are widely distributed in nature, appearing in diverse environments ranging from interstellar space to deep-ocean habitats and volcanic regions.1

Within living organisms, these compounds are essential components of life. They are found in:
* Proteins and Amino Acids: Essential building blocks such as cysteine, cystine, and methionine contain sulfur.1
* Biological Regulators: They are integral to enzymes, coenzymes, vitamins, and hormones, including insulin, biotin, and glutathione.1

Furthermore, organosulfur compounds are responsible for the distinct flavors and aromas of many common foods, including garlic, onion, broccoli, mustard, and coffee. In some cases, these compounds serve as defensive mechanisms for plants and animals, such as the tear-inducing factor in onions or the pungent secretions used by various species. Additionally, a global sulfur cycle facilitates the continuous interconversion of these organic substances with inorganic sulfide and sulfate ions in the environment.12