Proline
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Proline is a non-essential amino acid the body makes on its own and also obtains from dietary protein. It is a major building block of collagen.
Why it’s used
Taken by some as a standalone supplement to support skin, joint, or connective tissue health, often alongside other collagen-related amino acids like glycine and hydroxyproline.
What the evidence says
Proline's structural role in collagen is well established biochemically, but evidence that supplementing with free proline (as opposed to consuming dietary protein or collagen peptides) changes skin or joint outcomes is limited. There is no NIH Office of Dietary Supplements fact sheet specific to proline supplementation.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 49 records · searched August 2026
"Proline"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 56078 records · searched August 2026
"Proline"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
Most human research on collagen-related benefits has studied collagen peptide blends rather than isolated proline, so findings do not transfer directly to a standalone proline ingredient.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.