In brief: Glycine is a non-essential amino acid because the body can make it. It is also obtained from protein-rich foods, especially collagen-rich foods.
Where is glycine found?
| Food group | Interpretation |
|---|---|
| Gelatine/collagen | Very rich in glycine |
| Connective-tissue-rich meat | Relatively high content |
| Fish and meat | Regular protein sources |
| Legumes | Provide glycine alongside other amino acids |
Do people need glycine supplements?
There is no generally established daily glycine requirement for healthy adults as a separate amino acid. The body makes glycine, and varied protein intake adds more.
Why is collagen rich in glycine?
Glycine is a major structural component of collagen, so gelatine and collagen-rich animal tissues contain large amounts.
Supplements in context
Human studies of isolated glycine address specific questions and mostly small groups.[1] They do not establish a general need for supplementation.
FAQ
Is glycine essential?
No, the body can make it.
Which foods are especially rich in glycine?
Gelatine, collagen and connective-tissue-rich meat.
Do plants contain glycine?
Yes, plant proteins also contain glycine.
Does everyone need glycine powder?
No.
Conclusion
Glycine is widespread in foods and particularly concentrated in collagen-rich sources. Supplementation is not automatically necessary for healthy people.
