Tier 4 — mechanistic

Glycine metabolism in animals and humans: implications for nutrition and health

Wang W, Wu Z, Dai Z, Yang Y, Wang J, Wu G
Amino acids 2013 45(3):463-477

Bibliography

PubMed
PMID 23615880
DOI
10.1007/s00726-013-1493-1
Funding
Funding was not specified in the indexed abstract; the full funding disclosure has not been verified.
Competing interests
The accessible abstract does not establish the authors' competing interests; absence of a statement is not evidence of no conflicts.

Study snapshot

DesignNarrative review
ModelHuman and preclinical literature
SampleReview of animal and human glycine biology
InterventionDietary and endogenous glycine metabolism; no new intervention
DurationNot applicable; review
EndpointsBiosynthesis and degradation; Glutathione, collagen and creatine; Physiological functions

What the study showed, in plain terms

This foundational review explains glycine's roles in protein structure and multiple metabolic pathways. It discusses conditional requirements without defining a universal supplemental dose for healthy adults.

Key findings

  • Glycine supplies substrates for glutathione, heme, creatine and nucleic-acid synthesis.
  • Synthesis, degradation and tissue exchange influence glycine availability.

What this study can and cannot tell us

Mixed-species narrative review; biological necessity is not proof that extra intake improves every function.

Clinical claims require outcome-specific human studies.

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Editorial review

Reviewed by the Biohack Blueprint research team

Last verified

Dr. Khaled Mahmoud, MBBChCritical Care Medicine, Longevity Science & Editorial Direction