Effect of the Hot Water Extract of Coix lacryma-jobi L. var. ma-yuen Stapf with Husks on Skin Improvement

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  • UEHARA Shizuka
    Dermatology and Cosmeceutical Research Labs. , Research Labs., KOSÉ Corporation
  • YOSHIKAWA Chikako
    Dermatology and Cosmeceutical Research Labs. , Research Labs., KOSÉ Corporation
  • YOSHIDA Mitsuru
    Dermatology and Cosmeceutical Research Labs. , Research Labs., KOSÉ Corporation
  • MIZUNO Makoto
    Dermatology and Cosmeceutical Research Labs. , Research Labs., KOSÉ Corporation
  • RYU Akemi
    Dermatology and Cosmeceutical Research Labs. , Research Labs., KOSÉ Corporation
  • KYO Hoko
    Department of Complementary and Alternative Medicine Clinical Research and Development, Kanazawa University Graduate School of Medical Science
  • SUZUKI Nobutaka
    Department of Complementary and Alternative Medicine Clinical Research and Development, Kanazawa University Graduate School of Medical Science

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Other Title
  • ハトムギ全粒熱水抽出エキス摂取による肌改善効果
  • ハトムギ ゼン リュウ ネッスイ チュウシュツ エキス セッシュ ニ ヨル ハダ カイゼン コウカ

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Abstract

We examined the influence of hot water extract of coix seed (Coix lacryma-jobi L. var. ma-yuen Stapf) with husks on facial skin. Ten females (28-58 years old) took hot water extract of coix seed with husks 1 g/day for 8 weeks, and various skin parameters were measured. The results showed that the total amount of subsurface reflection of blue light, which is an index of skin translucency, increased significantly after 8 weeks of intake (p = 0.011). In addition, skin texture improved significantly after 4 and 8 weeks of intake (p = 0.007, p = 0.042). Additionally, the condition of tape-stripped stratum corneum also indicated significant improvement after 4 and 8 weeks intake (p = 0.0002, p = 0.020). These results suggested that the hot water extract of coix seed with husks exhibited effects even at 1 g/day, which is less than in previous reports.

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