Does Postbiotic Sleep Randomized Trial work?

The current Migaku evidence database contains 2 reusable source documents for Postbiotic Sleep Randomized Trial. This answer focuses on strength of evidence and what the studies can or cannot prove. - Compared with placebo, SNK improved Sleepiness on Rising ( p = 0.032) and Initiation and Maintenance of Sleep ( p = 0.010). [Watanabe T (2025); evidence level 2] - Heat-killed Lactiplantibacillus plantarum SNK12 (SNK), isolated from a traditional Japanese fermented food, has been suggested to influence sleep quality, but human data on sleep improvement with heat-killed lactic acid bacteria (postbiotics) remain limited. [Watanabe T (2025); evidence level 2] - We conducted a randomized controlled trial to test whether heat-killed SNK (≥1 × 10 11 cells/day for 4 weeks) improves sleep quality and alters stress-related immune and neuroendocrine biomarkers. [Watanabe T (2025); evidence level 2] - [1] [2] According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), specific criteria must be met to diagnose insomnia, including: (a) Dissatisfaction with sleep duration or quality, including difficulty falling asleep, prolonged sleep, and early awakening, accompanied by associated symptoms. [Wu Qiong (2026); evidence level 3] - Gaining a comprehensive understanding of the neural circuits associated with various chemicals involved in sleep-wake transition is crucial for advancing strategies for managing insomnia. [Wu Qiong (2026); evidence level 3] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.