Ribose is a simple sugar that is present in all living things. It has moderate humectant moisturizing properties in skincare, but is not used very often. It is manufactured from yeast or chemically derived from other sugars for use in cosmetic products.
Science
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Fiume, M. et al. (2019). Safety Assessment of Monosaccharides, Disaccharides, and Related Ingredients as Used in Cosmetics. International Journal of Toxicology, Vol. 38(Supplement 1) 5S-38S