A substance derived from animals or various types of mushrooms that has potent antioxidant and skin-soothing properties.

References for this information:

Journal of Cosmetic Dermatology, September 2007, pages 183–188

Biomedicine and Pharmacotherapy, September 2006, pages 453–457

Biochemical and Biophysical Research Communications, March 2003, pages 860-864

Food and Chemical Toxicology, November 1999, pages 1043–1053

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