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soy protein

Used as an emulsifier and emollient. Soy extract is a potent antioxidant and anti-inflammatory agent for skin. Soy is one of many phytochemicals that are biologically active against free radicals. Soy extract’s increasing use in anti-aging products is largely due to studies showing that its antioxidant genistein (a component of soy) has a collagen-stimulating effect and that various compounds in soy influence skin thickness and elasticity.

Researchers have also looked at Bifidobacterium-fermented soy milk extracts. On mouse skin and in human skin fibroblasts (lab cultured), this bacteria-modified form of soy was shown to stimulate the production of hyaluronic acid in skin. This was due to the amount of genistein released during the fermentation process.

Soy extract has been shown to help reduce the effects of UVB exposure on human skin cells. Soy has also been found to have anti-androgenic effects.

References Cited:

Stallings ALM. Practical Uses of Botanicals in Skin Care. J Clin Aesthet Dermatol. 2009;2(1):36-40.
Schmid D, Zülli F. Topically-Applied Soy Isoflavones Increase Skin Thickness.. Cosm & Toil. 2002 45-50.
Miyazaki K, Hanamizu T, Sone T, Chiba K, Kinoshita T, Yoshikawa S. Topical application of Bifidobacterium-fermented soy milk extract containing genistein and daidzein improves rheological and physiological properties of skin. J Cosmet Sci. 2004;55(5):473-9.
Südel K, Venzke K, Mielke H, Breitenbach U, C M, Jaspers S, Koop U, Sauermann K, Knussman-Hartig E, Moll I, et al. Novel aspects of intrinsic and extrinsic aging of human skin: beneficial effects of soy extract. Photochem Photobiol. 2005;81(3):581-7.
Park N, Park J, Kang Y, Bae J, Lee H, Yeom M, Cho J, Na Y. Soybean extract showed modulation of retinoic acid-related gene expression of skin and photo-protective effects in keratinocytes. Int J Cosmet Sci. 2013;35(2.):136-42.
Chiang H, Wu W, Fang H, Chen B, Kao T, Chen Y, Hung C. UVB-Protective Effects of Isoflavone Extracts from Soybean Cake in Human Keratinocytes. Int J Mol Sci. 2007;8(7):651-661.

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