Glycine is the simplest amino acid produced by the body, yet it plays a surprisingly broad role in human health. Research suggests that supplemental glycine may support sleep quality by lowering core body temperature and promoting relaxation, with several studies noting improvements in subjective sleep satisfaction and next-day alertness. Studies also indicate that glycine serves as a key building block for collagen, potentially supporting joint health and connective tissue integrity, while also acting as an inhibitory neurotransmitter involved in cognitive function. Additionally, preliminary research points to glycine's role in liver health, where it may help protect against oxidative stress and support the body's natural detoxification processes. Available primarily as a powder or in capsules, glycine continues to attract scientific interest for its wide-ranging physiological contributions.
Compare this supplementResearch suggests that glycine demonstrates meaningful anti-inflammatory properties across multiple lines of preclini...
View studies →Research suggests that glycine plays a meaningful role in brain signaling and cognitive function, with studies indica...
View studies →Research suggests that glycine, as the most abundant amino acid in collagen, plays a structurally critical role in co...
View studies →The studies provided in this set do not investigate glycine for joint health — they cover unrelated topics including ...
View studies →Research suggests that glycine plays a meaningful role in liver metabolism, particularly through its involvement in t...
View studies →The studies provided in this collection do not investigate glycine supplementation or its effects on sleep quality — ...
View studies →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Powder | 0.8–3 g | Daily | Cognitive function and schizophrenia adjunct therapy | Based on RCTs studying glycine as adjunct to antipsychotics and cognitive performance |
| Powder | 9–15 g | Daily | Collagen synthesis and connective tissue support | Common in clinical trials examining collagen production and joint health |
| Powder | 3–5 g | Daily | Liver health and non-alcoholic fatty liver disease | Used in clinical and preclinical research on hepatoprotective effects |
| Powder | 15–60 g | Daily | Metabolic syndrome and anti-inflammatory effects | Higher doses studied in trials targeting insulin resistance and inflammation |
| Powder | 3 g | Before bed | Sleep quality improvement | Used in RCTs showing improved subjective sleep quality and reduced fatigue |