Bangladeshi river sand mica passed safety tests with zero skin irritation and heavy metal levels within safe limits. It won't cause cancer at normal cosmetic exposure levels. Some types showed mild antibacterial benefits, though none worked against fungi.

Researchers tested mica samples for chemical composition, heavy metals, skin irritation (on rabbits), and ability to fight bacteria and fungi. They also had trained panelists evaluate texture and finish.

Funding not disclosed in abstract