Sulfur is widely distributed in nature. It is found in many minerals and ores, e.g., iron pyrites, galena, cinnabar, zinc blende, gypsum, barite, and epsom salts and in mineral springs and other waters. The metabolism of sulfur amino acids, methionine and cysteine, has been linked to several key aspects of human health and cellular function.

Sulfur in Food
Sulfur is found in garlic.

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Use of sulfur
Elemental sulfur is used in black gunpowder , matches, and fireworks; in the vulcanization of rubber; as a fungicide, insecticide, and fumigant; in the manufacture of phosphate fertilizers; and in the treatment of certain skin diseases.

Sulfur and Bad breath
Sulfur containing foods may cause bad breath, otherwise known as halitosis.

Sulfur in onions and tears
Onions contain sulfur. When onion cells are broken, they release sulfur in the air which react with moisture in eyes forming sulfuric acid. The sulfuric acid causes a burning sensation. The eye creates tears to dilute the sulfuric acid to protect the sclera and the cornea from the acid.

Sulfur in Plants
Sulfur-containing defense compounds are crucial for the survival of plants under biotic and abiotic stress. These sulfur compounds include elemental sulfur (S(0)), H(2)S, glutathione, phytochelatins, various secondary metabolites and sulfur-rich proteins. Their constitutive and/or stress-induced formation is intimately dependent on demand-driven sulfate uptake and assimilation.

Sulfur dioxide
Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 10 ppm will produce coughing. Sulfur dioxide is used as a bleaching agent, disinfectant, and refrigerant

Sulfur Mustard
Sulphur mustard is one of the major chemical warfare agents developed and used during World War I. Large stockpiles are still present in several countries. It is relatively easy to produce and might be used as a terroristic weapon. Sulphur mustard is a vesicant agent and causes cutaneous blisters, respiratory tract damage, eye lesions and bone marrow depression. The clinical picture of poisoning is well known from the thousands of victims during World War I and the Iran-Iraq war.