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โ† Encyclopedia

Glycine

Amino Acid

Also known as: Gly

B
Grade B
๐Ÿ’Š 3-5 g before bed for sleep; up to 10-15g for other uses๐ŸŽฏ 4 primary uses๐Ÿ”— 3 synergiesโš ๏ธ Review warnings
Compare Check interactions
Levels upMovement+50 pts

Overview

Simplest amino acid with diverse roles in collagen synthesis, sleep quality, neurotransmission, and detoxification.

Primary Uses
Sleep qualityCollagen synthesisDetoxificationNeuroprotection

Frequently Asked About Glycine

How much Glycine should I take?
The typical effective range is 3-5 g before bed. Individual needs vary based on age, body weight, diet, and goals โ€” start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take Glycine?
Before bed for sleep. Consistency matters more than perfect timing โ€” pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take Glycine with food?
Optional.
Does Glycine interact with medications?
Yes โ€” known interactions include Clozapine interaction theoretically. If you take any prescription medication, talk to your doctor or pharmacist before starting Glycine.
What does Glycine pair well with?
Glycine stacks well with Magnesium, NAC, and Vitamin C โ€” these combinations either improve absorption or work synergistically toward common goals.
Who should not take Glycine?
Glycine should be avoided or used with caution by people with None. Pregnant or breastfeeding women should consult a healthcare provider before use.
What are the side effects of Glycine?
Most people tolerate Glycine well. The most commonly reported side effects are Mild sedation and GI upset at high doses. Side effects are usually dose-dependent โ€” lowering the dose often resolves them.

Dosage

Typical range
3-5 g before bed for sleep; up to 10-15g for other uses
Timing
Before bed for sleep
With food
Optional
Dose Tiers
Moderate
3 g before bed
Optimal
3-5 g before bed
Therapeutic
10-30 g/day in divided doses
Upper Limit
No established UL
Duration

Safe long-term

Special Populations

Poor sleepers, detox support

Research & Studies

Landmark clinical studies on Glycine. Each title links to a plain-English breakdown โ€” what the study shows, what its limitations are, and how to read around them.

Browse all curated studies โ†’

Mechanism of Action

  • โ€ข Inhibitory neurotransmitter
  • โ€ข Precursor to glutathione
  • โ€ข 1/3 of collagen amino acids
  • โ€ข Lowers core body temperature

Evidence Quality

Evidence Grade B

Growing evidence for sleep and health

Safety & Contraindications

Serious Warnings
  • โ€ข None
Contraindications
  • โ€ข None
Common Side Effects
  • โ€ข Mild sedation
  • โ€ข GI upset at high doses
Pregnancy & Breastfeeding

Consult healthcare provider

Liver & Kidney Notes

May support liver

Interactions

๐Ÿ’Š Medications
  • โ€ข Clozapine interaction theoretically
๐Ÿงช Supplements
  • โ€ข Works with magnesium for sleep
๐Ÿฝ๏ธ Food & Alcohol
  • โ€ข No interactions

Stacking & Synergies

Avoid Combining With
None
Best Goal Synergies
SleepCollagenDetox

Buying Guide

What to Look For
  • โ€ข Pure glycine
Standardization Markers
Purity
Adulteration risk
Low
Practical Notes
  • โ€ข 3g before bed improves sleep quality
  • โ€ข Sweet taste - can add to drinks
Tags
amino acidsleepcollagendetox

Top Products with Glycine

Highest-scored catalog products containing Glycine, ranked by our scoring engine.

Browse all Glycine products โ†’

Related Guides

In-depth guides covering Glycine โ€” protocols, comparisons, and use cases.

More in Amino Acid

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Direct serotonin precursor, one step closer than tryptophan. More potent for mood and appetite but requires more caution.
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Glycine (for Relaxation)
Simplest amino acid with profound calming and sleep effects. Lowers body temperature.
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Glycine (Longevity Dose)
Simplest amino acid with emerging longevity benefits at higher doses. Supports glutathione, collagen, sleep, and may mimic methionine restriction.
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Hydrolyzed Whey Protein
Pre-digested whey protein with faster absorption than isolate or concentrate, ideal for post-workout recovery and those with digestive sensitivities.
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L Carnitine
L-carnitine is a naturally occurring compound synthesized from amino acids that plays a crucial role in transporting long-chain fatty acids into mitochondria for energy production. Evidence supports modest benefits for exercise performance and recovery in carnitine-deficient individuals, though benefits in healthy populations are limited.
B
L-Arginine
A conditionally essential amino acid that serves as a precursor to nitric oxide, supporting vasodilation and blood flow. Most evidence supports benefits for endothelial function and exercise performance, though clinical results are mixed.
B
Browse all Amino Acid ingredients โ†’
Last reviewed: June 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, June). Glycine โ€” Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/glycine

Educational content based on published research and our scoring methodology. Not medical advice โ€” consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.