Uncaria gambir contains varying amounts of polyphenols, mainly catechins. Catechin has a photo-protection activity which can be applied as sunscreen. The future goal of this cosmeceutical product is to prevent skin photo-damaging by UV-radiation.
http://www.kalbemed.com/Portals/6/1_21_250Analisis-Gambir-Uncaria%20gambir%20Roxb%20as%20Natural%20Cosmeceutical%20Agent.pdf
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