Calcium Sodium Borosilicate

Calcium sodium borosilicate is a milled borosilicate glass used as sparkling flakes or platelets that add glitter and light-catching shimmer to eyeshadow, highlighter, and other color cosmetics. CIR's expert panel reviewed data on this and related borosilicate glasses, including patch and eye-irritation testing, and concluded the ingredient is safe as used, with heavy-metal impurities like lead, arsenic, and mercury held to trace, low-parts-per-million specifications.

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.