From the Manufacturer:
"L-Methionine is an essential sulfur amino acid. The body cannot produce L-Methionine, which must be obtained from food or supplement sources. It is the principle supplier of sulfur which:
prevents disorders of the hair, skin and nails.
Helps lower cholesterol levels by increasing the liver's production of lecithin.
Reduces liver fat and protects the kidneys.
A natural chelating / chelation agent for heavy metals.
Regulates the formation of ammonia and creates ammonia-free urine which reduces bladder irritation.
Influences hair follicles and promotes hair growth. "