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Tryptophan

In 1989 the Food and Drug Administration received a spate of reports of the development of eosinophilia myalgia syndrome (EMS), a potentially fatal blood disorder, in people who had taken tryptophan supplements. Analysis by the FDA and the Centers for Disease Control (CDC) showed a definite link between the consumption of L-tryptophan tablets or capsules and EMS. Following was a nationwide recall of all over-the-counter dietary supplements in capsule or tablet form providing for 100 milligrams (mg) or more of L-tryptophan in a daily dose. Dietary supplements providing less than 100 mg. remain on the market pending further evaluation.