Sulphur is present in the amino acids such as methionine, cystine and cysteine. Thus, it is present in all proteins in the body. Especially connective tissue, skin, hair and nails are rich in sulphur. Also thiamine and biotin which are B-complex vitamins contain sulphur in their molecules.
Sulphur intake is mainly in the form of cystine and methionine present in protein.
Other compounds present in the food contribute small amounts of sulphur.
A diet that is adequate in protein supplies required amounts of sulphur.
Inorganic sulphate (So42-) is absorbed as such from the intestine into the portal circulation. Sulphur is excreted in the urine.
No specific sulphur deficiency has been observed in human beings.