Does L-Serine Sleep Quality Randomized Trial work?

The current Migaku evidence database contains 1 reusable source document for L-Serine Sleep Quality Randomized Trial. This answer focuses on strength of evidence and what the studies can or cannot prove. - In Study 1, factors related to "sleep initiation" and "sleep maintenance" during the L-serine intake period were significantly improved compared to the placebo intake period (p = 0.02 and p = 0.008, respectively). [Ito Y (2014); evidence level 4] - To investigate the effects of L-serine intake on human sleep, we conducted two randomized double-blinded crossover studies. [Ito Y (2014); evidence level 4] - In Study 1, healthy subjects who were dissatisfied with their sleep were given L-serine or a placebo 30 min before going to bed. [Ito Y (2014); evidence level 4] 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.