The major sources of sulphur are crucifers and animal proteins.
Proteins present in pulses have little sulphur. Therefore, other vegetable proteins or crucifers must be taken (Incidentally recent reports indicate that crucifers cause iodine deficiency).
The various functions of sulphur are -
(a) Sulphur containing amino acids take part in synthesis of proteins
(b) Some sulphur containing amino acids form coenzymes, e.g., glutathione.
(c) Sulphur is a component of vitamins like biotin and thiamine.
(d) In formation of astralrays.