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General description	Essential amino acids
Found	- brewers yeast - dairy products - meat - fish, seafood - eggs
Anti-aging role	- required for the absorption, transport and bioavailability of zinc and selenium in the body - prevent bacteria from adhering to the wall of the bladder - treatment for recurrent urinary tract infection - prevent acetaminophen toxicity
Deficiency symptoms	- apathy, lethargy - loss of pigmentation in the hair - edema - muscle loss, fat loss - liver damage - weakness - slowed growth in children
Therapeutic doses	500 mg taken 3 times / day - in treatment of urinary infection
Maximum safe level	Not established
Side effects	Animal studies suggest that a high intake of methionin in presence of B - vitamin deficiency may increase risk of developing atherosclerosis by increasing blood cholesterol and homocysteine level
Contraindications	- Parkinson disease - liver or kidney disease

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