GUANINE is graded A (Safe) by Expert·ING, based on COSING regulatory data.

GUANINE

Safety grade: A

Guanine is a naturally occurring compound found in fish scales and other sources that creates a shimmery, pearl-like appearance. It's commonly used in cosmetics to add sparkle and shine to products.

Guanine is used as an opacifying agent to make products less transparent and add a lustrous, iridescent shimmer that enhances the visual appeal of cosmetics.

Graded using: COSING.

Last verified: May 26, 2026