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

THYMINE

Safety grade: A

Thymine is one of the building blocks of DNA, the genetic material found in all living cells. In skincare, it's used as a conditioning agent to help support skin health and maintain moisture.

Thymine is used in cosmetics for its skin conditioning properties, helping to improve skin texture and maintain hydration for a smoother, more comfortable complexion.

Graded using: COSING, FDA.

Last verified: May 26, 2026