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High doses of tryptophan may cause eosinophilic fasciitis.

Stress, nutritional issues, and chronic diseases can cause hair loss, and nail changes may signal internal diseases; treatment focuses on the underlying cause.

Eosinophilia-myalgia syndrome, linked to contaminated L-tryptophan supplements, caused severe symptoms and some deaths, with long-term effects in survivors.

Hair color is influenced by genetics and can indicate certain health conditions.

Enzymes are classified into six types and are essential for many biological processes, with only a few targeted by drugs.