Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD) has been difficult. Newer permanent and demipermanent hair dyes that have replaced PPD with para ...
The trending style is synonymous with that perfectly imperfect and hassle-free look, and it's graced the heads of Rihanna, Gracie Abrams, and Hailey Bieber as of late. "The Italian bob is a lesson in ...
The intensity of hair color depends on the density of pigment within the melanosome. Both eumelanin and pheomelanin are made from the amino acid tyrosine, using the enzyme tyrosinase. Increased ...