Irritants , Plant Extracts
Component of many plants. It can have an anti-tumor benefit when consumed in tea or foods (Source: Nutrition and Cancer, 1998, volume 32, number 2, pages 81–85). There is some research on animals showing that this benefit may translate to skin (Source: Photochemistry and Photobiology, June 1998, pages 663–668). Tannins can also have constricting properties on skin, and may cause irritation with repeated use.

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