“Proline?”Here!
Hasn’t appeared in a scanned product yet.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
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: 7823 records · searched September 2026
"Proline"[Title/Abstract] AND (review[pt] OR "safety assessment"[Title/Abstract] OR "risk assessment"[Title/Abstract] OR toxicology[Title/Abstract] OR toxicity[Title/Abstract] OR characterization[Title/Abstract] OR characterisation[Title/Abstract]) - PubMed: 49 records · searched September 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: 56359 records · searched September 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.
Rumors
Proline, taken with vitamin C and lysine, combats coronary heart disease by stopping Lp(a) cholesterol from binding to artery walls.
We haven’t found evidence strong enough to support this or rule it out.
What was measured is not yet noted.
Who’s saying this
- paulingtherapyforheartdisease.com — we couldn’t open the site to see who runs it
L-proline supplements promote wound healing.
We haven’t found evidence strong enough to support this or rule it out.
What was measured is not yet noted.
Who’s saying this
- iherb.com — we couldn’t open the site to see who runs it
L-proline eases joint pain.
We haven’t found evidence strong enough to support this or rule it out.
What was measured is not yet noted.
Who’s saying this
- community.bulksupplements.com — the site doesn’t say who runs it
Proline supplements reduce visible signs of skin aging by boosting collagen formation.
Not gradedhealth and safety evidence
Sources cited — no verdict reached.
What was measured is not yet noted.
- A collagen amino acid composition supplementation reduces biological age in humans and increases health and lifespan in vivo (Peer-reviewed) · Funded by Swiss National Science Foundation; Avea Life AG (funded the human study) (industry) · Authors declare a conflict of interest
Who’s saying this
- PureBulk — a brand: sells pure dietary supplement powders, oils and capsules
How we know who this is
- “PureBulk was founded in 2008 by Timothy McNulty with a simple idea, that people can save money by buying the dietary supplements they want, without the fillers and additives.” (their page)
- “PureBulk offers a variety of over 250 pure dietary powders, oils and capsules as well as the tools necessary for you to accurately measure your supplements and make your own custom supplement blends and formulations using your own ingredients.” (their page)