Compound or practice · Supplement
Collagen Peptides
Real, if modest, evidence for tendon, joint, and skin outcomes when taken with vitamin C before loading — better than its hype suggested a decade ago.
- Overall grade
- Grade B
- Last revised
- 3
- graded outcomes
- 0
- references listed
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
3 at grade B · 1 at grade C — 4 graded rows
What is known
Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.
- Joint pain / osteoarthritisEvidence grade B
Athletes and OA
Smallmixed
- Skin elasticityEvidence grade B
Modest improvement
Smallmixed
- Tendon / ligamentEvidence grade C
With vitamin C, pre-load
Smallmixed
Conditions
How the entry reads its effect on diagnosed conditions: the direction first, then the grade. Never a substitute for the person who treats you.
- Osteoarthritis May improveEvidence grade BPain/functionGrade B
What is uncertain
Read off the same rows as above. Nothing here is added that the entry does not itself record.
- Thin evidence: Tendon / ligament (grade C).
- Studies disagree: Joint pain / osteoarthritis (mixed agreement); Skin elasticity (mixed agreement).
Interactions
Documented pairings with supplements and medicines. A medicine on this list is a conversation for whoever prescribes it.
Vitamin CWorks together
The cofactor for collagen cross-linking — take together.
The evidence in words
What it is
Collagen peptides are hydrolyzed collagen (from bovine, marine, or porcine sources) delivering the glycine/proline/hydroxyproline the connective-tissue matrix is built from.
How it works
Peptides may signal fibroblasts to increase collagen synthesis and supply substrate; the vitamin-C cofactor is required for the hydroxylation steps that stabilize collagen.
What the evidence shows
Growing trial evidence supports modest improvements in joint pain (including in athletes and osteoarthritis), tendon/ligament outcomes, and skin elasticity/hydration. Taking 15 g with vitamin C ~30–60 minutes before loading the tissue is the protocol from tendon studies.
How to use it
10–15 g collagen peptides with ~50 mg vitamin C, ideally 30–60 minutes before training or rehab loading.
Safety & interactions
Very safe; it is food-grade protein. It is not a complete protein, so it doesn't count toward muscle-building protein targets. Vitamin C — The cofactor for collagen cross-linking — take together.
Bottom line
One of the better connective-tissue supplements: 15 g with vitamin C before you load the joint or tendon. Modest, real, low-risk.
How it is used
As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.
- Standard
- 10–15 g with 50 mg vitamin C, 30–60 min pre-load.
Goes with
- Vitamin CThe cofactor for collagen cross-linking — take together.Evidence grade A
Related reading
Entries that share this one's tags or conditions.
- Collagen Peptides for Joint pain / osteoarthritisEvidence grade B — Athletes and OAEvidence grade B
- Collagen Peptides for OsteoarthritisEvidence grade B — Pain/functionEvidence grade B
- Collagen Peptides for Skin elasticityEvidence grade B — Modest improvementEvidence grade B
- Collagen Peptides for Tendon / ligamentEvidence grade C — With vitamin C, pre-loadEvidence grade C
Sources
This entry lists no references of its own.
Last revised . A grade is this entry's reading of the evidence, not medical advice.