What amino acid has been linked to the development of the rare blood disorder eosinophilia myalgia in people who took it as a supplement?

Name: What amino acid has been linked to the development of the rare blood disorder eosinophilia myalgia in people who took it as a supplement?
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Question

Quizplus · Accepted Answer

Tryptophan supplements were linked to an outbreak of eosinophilia-myalgia syndrome (EMS) in the late 1980s, which was traced back to contaminated batches of the supplement.

What Amino Acid Has Been Linked to the Development of the Rare