Tryptophan, copper and zinc in hair of healthy subjects. Correlation with differences in hair pigmentation.

@article{Allegri1990TryptophanCA,
  title={Tryptophan, copper and zinc in hair of healthy subjects. Correlation with differences in hair pigmentation.},
  author={Graziella Allegri and Carlo Virgilio Luigi Costa and Monica Biasiolo and Roberto Arban and Antonella Bertazzo and E L Cardin de Stefani},
  journal={The Italian journal of biochemistry},
  year={1990},
  volume={39 4},
  pages={209-15}
}
Tryptophan, copper and zinc levels were determined in the hair of 300 healthy subjects divided by sex, age and hair colour. Sex influences tryptophan content in hair, the levels of this amino acid being higher in males than in females. Tryptophan is also higher in infancy (2-5 years) and in both males and females aging around 80 years and over. Hair colour also influences tryptophan levels, which increase from fair to black hair. Copper levels are similar in hair of both males and females… CONTINUE READING

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