Heart Disease 8. It supplies sulfur and other compounds required by the body for normal metabolism and growth. Persons with AIDS have low levels of methionine. However, another form of methionine, S-adenosylmethionine, or SAMe , may worsen the symptoms of Parkinson's disease and should be avoided until more is known. Meat , fish , and dairy are all good sources of methionine.
Most people consume plenty of methionine through a typical diet.
Lower intakes during pregnancy have been associated with neural tube defects in newborns, but the significance of this is not yet clear. Therefore, most people would not benefit from methionine supplementation. This idea has not yet been tested in humans. However, whether this relationship creates a significant hazard for humans taking supplemental methionine has not been established. Supplementation of up to 2 grams methionine daily for long periods of time has not produced any serious side effects.