Thiotaurine

Thiotaurine is a sulphur-containing compound that acts as a hydrogen sulfide (H₂S) donor in skincare formulations. Hydrogen sulfide is a signalling molecule naturally present in the body, involved in various protective and regulatory functions at the cellular level.In skincare, thiotaurine is primarily used for its antioxidant properties. It works to neutralise free radicals and oxidative stress—the unstable molecules that damage skin cells and contribute to visible ageing and inflammation.

Thiotaurine functions as a hydrogen sulfide donor, releasing H₂S molecules within the skin. Hydrogen sulfide modulates calcium channels and cellular signalling pathways, which influence how skin cells respond to oxidative stress and damage. By releasing H₂S, thiotaurine helps activate the skin's own protective processes.The ingredient also works as a direct antioxidant, neutralising free radicals before they can oxidise skin lipids and proteins—a process that accelerates visible ageing and inflammation.

Thiotaurine is typically used as part of a broader antioxidant skincare routine. It works well alongside other protective ingredients such as vitamins C and E, and niacinamide. Apply as directed by the product instructions, usually once or twice daily. For best results, use consistently over several weeks, as antioxidant benefits build with regular use.

Thiotaurine is generally well-tolerated in skincare formulations. No significant safety concerns have been documented at cosmetic concentrations, though patch testing is advisable for those with sensitive skin or known sulphur sensitivities.