TopicsSupplements and minerals
Glycine
For amino acid supplementation
The experts we follow agree on this.
Glycine is valued for its calming and restorative roles, but individual responses vary.
Who is behind it
Voices including a nutritional sciences PhD, a former research biochemist and a certified naturopath.
How strong the research is
Well studied in published research, as well as in practice.
In their words
“Start slow with 3 grams, make sure that you try free glycine and you try collagen, pick the one that works the best with the least GI distress.”
a nutritional sciences PhD
Glycine buffers excess methyl groups preventing over methylation of unintended targets.
Glycine fights inflammation by controlling substances that cause swelling and pain and protecting cells during inflammation.
Creatine supplementation can deplete glycine status, so increasing glycine intake supports methylation and other physiological functions.
Glycine supports neurotransmission, sleep, metabolism, growth, immunity, development, and survival, with benefits in various injury and regulatory functions.
Glycine is useful for restoring function and improving sleep quality by acting as an inhibitory neurotransmitter that helps induce quicker and deeper sleep.
With care
Some of the minds attach conditions. These are worth reading before you begin.
There is no downside to doing most amino acids like glycine, and some people use arginine for growth hormone release with marginal efficacy.
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Well studied in published research, as well as in practice.
None of the statements here come with a declared commercial interest. Last refreshed 23 September 2026.
The research beneath it
- Glycine and N-acetylcysteine (GlyNAC) supplementation in older adults improves glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, insulin resistance, endothelial dysfunction, genotoxicity, muscle strength, and cognition: Results of a pilot clinical trial.Clinical and translational medicine, 2021
- Glycine treatment decreases proinflammatory cytokines and increases interferon-gamma in patients with type 2 diabetes.Journal of endocrinological investigation, 2008
- The metabolic response to ingested glycine.The American journal of clinical nutrition, 2002
- Adjunctive high-dose glycine in the treatment of schizophrenia.The international journal of neuropsychopharmacology, 2001
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