Consumers should avoid all hair products that contain the chemical glyoxylic acid, a top doctor warned this week, after a 17-year-old girl who underwent a hair-straightening treatment was hospitalized ...
Permanent hair dyes promise vibrant, long-lasting colour, but many contain a hidden risk: a chemical called p-phenylenediamine, or PPD. While essential for keeping hair shades bold, PPD has been ...
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