Glycine is a powerful sleep aid
6.0Moderate
evidence
evidence
The Claim
Many people believe that glycine can significantly improve sleep quality and duration, often using it as a natural remedy for insomnia.
Origin
This belief likely stems from anecdotal reports and a few small studies suggesting glycine's role in sleep regulation.
What Science Says
Research shows some potential for glycine in improving subjective sleep quality. A few small, randomized controlled trials (RCTs) indicated that glycine can help reduce sleep onset latency and improve sleep efficacy. However, the effect sizes are modest, and more large-scale RCTs are needed to confirm these findings.
Verdict
Partially True
Sources
- PMID:36094342 Nutritional Modulation of Sleep Latency, Duration, and Efficiency: A Randomized, Repeated-Measures, Double-Blind Deception Study.
- PMID:37874350 Collagen peptide supplementation before bedtime reduces sleep fragmentation and improves cognitive function in physically active males with sleep complaints.
- PMID:20202927 Evidence for the efficacy of complementary and alternative medicines in the management of fibromyalgia: a systematic review.