Glutathione can be dissolved directly into the water phase of serums, emulsions, or gel formulations. It is best added at cool-down once the formulation has dropped below 40 °C. For synergistic effects, it is commonly paired with cosmetic actives such as alpha arbutin, kojic acid, vitamin C derivatives, or niacinamide to support brightening and antioxidant activity. Always check pH and stability in the final formula to maximize performance.

Benefits

Reduced L-Glutathione is known in cosmetics for its antioxidant properties, helping protect skin against external stress factors. It supports a more luminous, balanced-looking complexion while contributing to the overall effectiveness of brightening and anti-aging blends.

Safety

This ingredient is for external use only. Always formulate within recommended use levels and conduct patch testing on finished products before regular use. It is not intended for ingestion or pharmaceutical applications.

Reduced L-Glutathione is a fine white to off-white crystalline powder with a slightly sulfuric odor. It is water-soluble and should be incorporated into the aqueous phase or during the cool-down stage of formulation at temperatures below 40 °C to preserve stability. Typical cosmetic use levels range from 0.1% to 2%. It is most stable in formulations with a pH between 5.0 and 7.0. Store in a tightly sealed container at 2–8 °C in a cool, dry environment, away from direct sunlight and humidity. Under proper conditions, shelf life is approximately 24 months.