This is a summary of research papers and studies
from the National Center for Biotechnology Information (NCBI)
ABOUT SOYBEAN EXTRACT
Soybean extract, derived from the legume species Glycine max, has emerged as a versatile and potent ingredient in both nutritional and dermatological applications. Native to Southeast Asia and cultivated globally, the soybean is rich in phytochemicals, proteins, and lipids that offer significant health benefits. In dermatology, soybean extract is valued for its antioxidant, anti-inflammatory, and skin-rejuvenating properties, making it a staple in treatments for aging, hyperpigmentation, and barrier dysfunction.
Properties
The efficacy of soybean extract in skincare is rooted in its complex chemical composition. It contains a high concentration of isoflavones, which are a type of polyphenol. The most prevalent isoflavones in soy are genistein and daidzein, often referred to as phytoestrogens due to their structural similarity to human estrogen.
Beyond isoflavones, soybean extract contains:
- Serine Protease Inhibitors: Responsible for skin-lightening effects.
- Saponins: Bioactive constituents like soyasaponin that offer antioxidation, anti-inflammation, and water retention capabilities.
- Lipids and Lecithins: Including phospholipids and phytosterols that enhance the skin’s natural moisture barrier.
- Proteins and Fibers: Essential for nutritional support and structural integrity in animal and in vitro models.
Functions
Soybean extract functions to improve skin health in several ways.
Supporting Collagen and Elastin
A primary function of soy isoflavones, particularly genistein, is the inhibition of enzymes responsible for the breakdown of collagen and elastin, the two proteins essential for skin firmness and elasticity. Soy extract prevents chronological and UV-induced skin sagging and wrinkling. Furthermore, saponin-enriched soy extracts have been shown to stimulate type 1 collagen synthesis in skin.
Skin Lightening For Skin
Whitening and the treatment of hyperpigmentation, soy extract blocks the transfer of melanin-containing melanosomes from melanocytes to the surrounding skin cells. This process leads to reduced melanin in the skin and prevents UVB-induced pigmentation.
Plant Estrogen Activity
The isoflavones are particularly beneficial for post-menopausal women, as declining estrogen levels are associated with skin thinning and loss of elasticity. Clinical evidence suggests that soy supplementation can mimic some of the beneficial effects of estrogen on the skin, such as increasing skin thickness and collagen density.
Benefits for the Skin
Anti-Aging
Clinical studies have consistently demonstrated that soy treatments reduce signs of aging. In post-menopausal women, soy supplements have significantly improved forehead, eye, and mouth wrinkles, while also reducing facial skin sagging, with significant improvements in mottled pigmentation, fine lines, and overall skin texture observed after 12 weeks of use.
Hyperpigmentation and Skin Tone
Soy extract is a highly effective natural alternative to synthetic whitening agents like hydroquinone. Topical application of soy-based formulations has been shown to reduce blotchiness, dullness, and age spots. In clinical trials involving subjects with uneven skin tone, soy extracts paired with niacinamide significantly improved skin fairness and radiance.
Acne Management
Soy supplementation (specifically 160 mg daily) has been shown to significantly reduce acne lesion counts.
Conclusion
Soybean extract is a multifaceted dermatological powerhouse. Its ability to inhibit collagen-degrading enzymes, block unwanted pigment transfer, and restore the skin’s lipid barrier makes it an invaluable tool for maintaining skin health. Soy-based products offer a scientifically validated, "natural" approach to treating a wide range of conditions from common acne and dry skin to complex photoaging and inflammatory disorders.