Glycine
amino acids
Glycine is a simple, non-essential amino acid that serves as a neurotransmitter and is crucial for collagen synthesis, muscle function, and central nervous system regulation. It plays key roles in sleep quality, joint health, and cognitive performance. Research suggests glycine may support relaxation and improve sleep architecture.
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Benefits
Dosage
Typical Dose
3-5g daily
Upper Limit
10g daily
Timing
Evening for sleep benefits; anytime for general health
Forms & Bioavailability
Powder
Excellent absorption; rapidly crosses blood-brain barrier
Capsules
Good absorption; convenient dosing
Tablets
Comparable to capsules; standardised dosing
Side Effects
Interactions
Research Summary
Glycine has demonstrated efficacy in improving sleep latency and sleep quality in clinical studies, particularly at doses of 3g before bedtime. Evidence supports its role in collagen synthesis and joint health, though more research is needed regarding long-term supplementation effects. Some studies indicate potential benefits for cognitive function and anxiety reduction, though results remain preliminary.
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The Bottom Line on Glycine
Glycine is well-researched with strong evidence supporting its primary benefits.It is most commonly used for improves sleep quality and sleep onset and supports collagen formation and joint health. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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