Glycine is a versatile supplement that improves metabolic health, sleep, stress management, cardiovascular health, and body composition.

noli's read

Glycine is an amino acid essential for collagen synthesis and the production of glutathione, a major antioxidant. Meta-analyses and randomized controlled trials (RCTs) confirm its efficacy in improving sleep quality and reducing daytime sleepiness by acting as a modulator of the nervous system. Regarding metabolic health, evidence from observational studies and small RCTs suggests it may help regulate blood glucose and improve endothelial function in certain profiles. However, the claim that it 'reduces inflammation' or 'improves body composition' directly is more nuanced: these effects are often observed in subjects with deficiencies or specific metabolic conditions, and not systematically in healthy individuals. Benefits for psychiatric symptoms are the subject of promising research but remain preliminary. In short, glycine is a recognized metabolic support, but its systemic effects are often amplified in wellness discourse.

the sources

No named source held this one up — that absence is part of the verdict.