Effects of a Fermented Sake Lees Product and Kwanso Concentrated Extract on Morning Drowsiness in Physically and Mentally Healthy Japanese Adults

Key Points

• The research aimed to evaluate the effects of a fermented sake lees product and kwanso extract on morning drowsiness in healthy adults.
• Randomized trial with 112 participants consuming either the test foods or placebo for 12 weeks.
• Participants took five capsules before bedtime daily.
• Sleep quality was assessed using OSA-MA and PSQI-J questionnaires.
• Fatigue and mood state were also evaluated using salivary amylase and tympanic temperature measurements.
• Significant improvement in the OSA-MA measured 'morning drowsiness' after 12 weeks of test food intake.
• Group differences observed in 'sleep duration' and some sub-items on the OSA-MA post-intervention.
• PSQI-J overall scores showed significant differences between groups.