Scientists have done such an experiment, because γ-PGA ultra-polymer has a very good isolation and blocking effect, after forming a protective film on the skin surface, it can reflect most of the ultraviolet radiation. They used this anti-oxidant effect to add a trace amount of polyglutamic acid to bread and other foods, and found that it can effectively prevent the skin from scorching and baking, and the bread after baking is below 30 degrees at room temperature, which can extend the shelf life 30 hours, while ordinary bread has a slight peculiar smell after being left for 8 hours. Whitening is not only to dilute melanin, but more importantly, to focus on sun protection, whitening from the source, because melanin is mainly formed by "tyrosinase", and ultraviolet radiation is the main inducement for the production of "tyrosinase". In addition, the function of γ-PGA to protect against ultraviolet rays has a great advantage, that is, it can effectively ensure that other whitening ingredients work. Although vitamin C and arbutin and other effective ingredients have very good whitening effects, most of them are afraid of ultraviolet rays. The characteristic of oxidation, and the fusion of polyglutamic acid can just avoid this defect.

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