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Effects of Consumption of Black Soybean Seed Coat Extract on Sleep Quality in Healthy Japanese: A Randomized,
Ryota Akagi1, Toshinari Maruo1, Tsuyoshi Takara2
1Innovation Center, Fujicco Co., Ltd. Kobe Hyogo Japan.
Food Science & Nutrition
|June 12, 2025
Summary
Black soybean seed coat extract (BE) improved sleep quality in adults with poor sleep. BE reduced sleepiness on rising and sleep-onset latency, benefiting men and women differently.
Area of Science:
- Nutritional Science
- Pharmacology
- Sleep Medicine
Background:
- Poor sleep quality affects a significant portion of the adult population.
- Black soybean seed coat extract (BE) is a natural compound with potential health benefits.
- Existing research suggests BE may possess antioxidant and autonomic neuromodulatory properties.
Purpose of the Study:
- To investigate the efficacy of black soybean seed coat extract (BE) in improving sleep quality.
- To evaluate the effects of BE on sleepiness, sleep latency, and other sleep parameters in healthy adults with poor sleep quality.
Main Methods:
- A double-blind, placebo-controlled, randomized trial was conducted with 64 participants.
- Participants received either BE capsules or placebo daily for 12 weeks.
- Sleep quality was assessed using the Oguri-Shirakawa-Azumi sleep inventory MA (OSA-MA), PSQI-J, and other measures.
Main Results:
- BE intake significantly improved sleepiness on rising compared to placebo.
- BE reduced sleep-onset latency and subjective dry mouth, and increased palmar surface temperature.
- Beneficial effects included reduced sleepiness in men, increased sleep duration in women, and improved sleep quality in individuals aged 40+.
Conclusions:
- Black soybean seed coat extract (BE) is effective in improving sleep quality and reducing sleepiness.
- BE's effects are attributed to vasodilation, increased skin temperature, and antioxidant/autonomic neuromodulatory actions.
- BE represents a promising natural intervention for individuals experiencing poor sleep quality.
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