Glycine
Lowers core body temperature to deepen sleep — 3g before bed reduces daytime fatigue and boosts next-day cognition.
Glycine is a non-essential amino acid that plays a crucial role in sleep quality. Taking 3g before bed has been shown in multiple studies to improve deep sleep, reduce daytime fatigue, and enhance cognitive performance the next day. It works by lowering core body temperature, a key trigger for sleep onset.
Drops body temperature to trigger deeper sleep
Acts as a co-agonist at NMDA receptors
Key building block for collagen production
How Glycine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
3g before bed
Can be taken without food
| Form | Type |
|---|---|
| 🧪Powder (dissolves easily, tastes sweet) | Recommended |
| 💊Capsules (need multiple for 3g dose) | Alternative |
Powder is most practical as capsules require 4-6 pills for 3g. Tastes naturally sweet, can be mixed in water or taken directly.
Minimum: 1 weeks
Optimal: 2 weeks
Cycling: Not required
Note: Take on empty stomach or with light snack before bed. 3g is the well-studied dose; higher doses are not more effective.
More time in restorative deep sleep stages
Feel more refreshed and alert the next day
Fall asleep more easily
Powder has a naturally sweet taste
Glycine is a normal dietary amino acid; supplementation not well-studied in pregnancy
May be particularly beneficial for age-related sleep issues
May reduce clozapine effectiveness
May have additive effects
Tip: Take with small snack
Tip: Usually not problematic; may reduce over time
Magnesium for relaxation, glycine for deep sleep
Comprehensive sleep quality improvement
Both promote relaxation through different mechanisms
Enhanced pre-sleep relaxation and sleep quality
Apigenin for onset, glycine for deep sleep
Comprehensive sleep support
L-serine converts to glycine
Enhanced neurotransmitter and collagen support
Both support sleep through different mechanisms
Comprehensive sleep quality improvement
Top studies from 39+ peer-reviewed papers
Soh J et al. • GeroScience (2024)
“This systematic-review examined the effects of Glycine.”
Huang X et al. • PloS one (2024)
“Our results confirm the adverse effects of ICP on co-existing pregnancy complications, obstetric and neonatal outcomes.”
Zhu Z et al. • The American journal of clinical nutrition (2023)
“Increased glutamic acid, aspartic acid, and gamma-aminobutyric acid and decreased glycine in plasma are associated with adverse outcomes after ischemic stroke, suggesting that plasma amino acid neurotransmitters may be potential intervention targets for improving prognosis of ischemic stroke.”
Morze J et al. • Diabetes care (2022)
“Several plasma and serum metabolites, including amino acids, lipids, and carbohydrates, are associated with type 2 diabetes risk.”
Błaszczuk A et al. • Nutrients (2022)
“This meta-analysis provides evidence that consuming flaxseed, soy and red clover can have a beneficial effect on lipids in postmenopausal women and suggest a favorable effect in preventing cardiovascular diseases.”
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