Age-dependent measurements of amino acids in human hairs — a longitudinal study

The amino acid composition of 148 hair samples from three sisters, covering an age-range of 13–238 months, were analysed using high performance liquid chromatography (RP-HPLC). The measured amino acid concentrations of the three donors showed different individual variation with age. The most pronounced alterations were observed in the concentrations of serine witch occured at the age of 12–14 years. This effect can be explained by the influence of hormonal factors during puberty.