Glycine (Sleep Onset)
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Glycine (Sleep Onset). 3 g pre-bed lowers core body temperature and improves subjective sleep.
How it works. Activates suprachiasmatic NMDA receptors → peripheral vasodilation → core temp drop.
What the research supports. 1 graded claims. Strongest: Improves sleep quality and morning alertness (moderate).
How much to take. Typical dose: 3 g pre-bed.
Side effects and interactions. 1 medication interaction listed. Serious: Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing.
Stacking. Pairs well with Magnesium glycinate, L-theanine.
Common forms. Available as Free-form crystalline powder, Capsules or tablets, Pre-mixed recovery or hydration beverages, Time-release formulations.
Key studies. 8 studies cited. The strongest are listed with links to PubMed.
Community. Experiences from people who have tried Glycine (Sleep Onset). Anecdotes are not medical advice.
Glycine (Sleep Onset). 3 g pre-bed lowers core body temperature and improves subjective sleep.
What it is
3 g pre-bed lowers core body temperature and improves subjective sleep.
Food sources
Goals
How it works
Activates suprachiasmatic NMDA receptors → peripheral vasodilation → core temp drop.
Pathways
- Activates suprachiasmatic NMDA receptors → peripheral vasodilation → core temp drop
Effects
- +sleep quality and morning alertness supports
What the research supports
Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.
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Side effects & interactions
Common side effects
- Glycine (Sleep Onset) is generally well-tolerated at evidence-based doses
- Mild GI discomfort (nausea, loose stools, or bloating) possible at higher intakes
- Headache or transient fatigue reported by a small fraction of users
Serious
- Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing
Medication interactions
Always disclose Glycine (Sleep Onset) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.
Check any supplement–medication combination with your pharmacist before starting.
Combines with
Pairs well
- Magnesium glycinateComplementary GABAergic calming and improved sleep architecture.
- L-theanineReduces sleep latency without sedation.
Common forms
- Free-form crystalline powder
- Capsules or tablets
- Pre-mixed recovery or hydration beverages
- Time-release formulations
Key studies
8 studies cited in total.
Opens current human and preclinical literature matching Glycine (Sleep Onset) and "Improves sleep quality and morning alertness". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Glycine (Sleep Onset) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.
Opens current human and preclinical literature matching Glycine (Sleep Onset) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.
Discussion
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