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This research found that heavy metal concentrations of arsenic, lead, cadmium, and iron were significantly higher in human hair samples from 100 years ago compared to today's levels in southern Poland, with a median decrease of 69–95%.

This study found higher concentrations of chromium, lead, and arsenic in the hair of workshop workers and traffic officers compared to a control group, indicating occupational exposure to these metals. Mercury levels varied across exposed groups, suggesting additional lifestyle factors may influence metal accumulation.

This study observed that exposure to heavy metal salts affected skin and hair morphology in mice, with lead acetate decreasing keratinocyte proliferation and zinc sulfate and sodium dichromate increasing it.

This research highlights that various environmental pollutants, including particulate matter, tobacco smoke, and heavy metals, can significantly affect hair follicle health, linking them to conditions like alopecia areata and androgenetic alopecia, underscoring the need for further study in this area.

This article reviews the risks of metal exposure from cosmetic products and emphasizes the need for stricter regulation and consumer awareness, without presenting new data or results.