Search interest in creatine and collagen together has more than doubled in a year. The evidence has not moved with it: no randomised trial has given creatine and collagen peptides together and measured the result. The two substances have met in the literature only twice, and both times they were set against each other. This is research journalism and contains no usage guidance, per our editorial standards.
Counting what exists
A PubMed search run on 2026-09-17 — creatine[tiab] AND (collagen peptide*[tiab] OR collagen hydrolysate[tiab] OR gelatin[tiab]) NOT creatine kinase[tiab] — returns 24 records. Most are narrative reviews listing both as separate supplements, or have nothing to do with supplementation at all (a bone-scaffold paper, a cardioplegia study, a chick diet study from 1996). Dropping the gelatin term and asking for randomised trials pulls in creatine kinase, the blood marker, which appears in nearly every collagen recovery trial and says nothing about creatine the supplement.
The ClinicalTrials.gov registry, queried the same day for creatine AND collagen, returns 48 studies. Of the first ten, one involves both as supplements, and it is the trial described next.
The two trials that used both
McMaster University, 2021. Twenty-six healthy adults aged about 22 (13 men, 13 women) did 10 weeks of progressive resistance training. Twice a day, one group drank a supplement of 20 g whey protein, 2 g leucine, 2.5 g creatine monohydrate, calcium and vitamin D. The other group drank the placebo: 20 g collagen peptides, 1.4 g alanine and 0.6 g glycine, matched for nitrogen and energy. Lean body mass rose 4.1 ± 1.3 kg in the supplement group and 2.8 ± 1.7 kg on placebo; biceps cross-sectional area and thickness increased more with the supplement, and vastus lateralis area did not differ (Wageh et al., Med Sci Sports Exerc 2021;53(8):1699–707, PMID 33756525; registered as NCT03525197).
McMaster University Medical Center, 2024. A retrospective analysis of a three-month home-training trial in older men, with a subgroup of overweight or obese participants carrying a metabolic-syndrome risk factor. The comparison arm (n = 8) took collagen peptides and safflower oil; the active arm (n = 12) took whey and casein, creatine, calcium, vitamin D3 and fish oil. Appendicular lean mass moved +2% against −0.8%, and leg press strength +17% against −1.4% (Nilsson et al., Nutrients 2024;16(24):4407, PMID 39771028). The paper's conflict statement records that two authors were employed by the Exerkine Corporation and the senior author is its chief executive.
| Trial | Arm with creatine | Arm with collagen | Could it isolate creatine? |
|---|---|---|---|
| Wageh 2021, 26 young adults, 10 wk | Whey + leucine + 2.5 g creatine ×2/day | 20 g collagen peptides + alanine + glycine ×2/day | No — whey and leucine changed at the same time |
| Nilsson 2024, 20 older men (subgroup), 12 wk | Whey/casein + creatine + Ca + D3 + fish oil | Collagen peptides + safflower oil | No — five ingredients changed at once |
The pattern is not an accident. Collagen is a convenient low-quality protein control: it supplies nitrogen, but it is low in leucine and contains no tryptophan, so it lets a trial hold protein amount constant while changing protein quality. We set out why collagen scores so poorly as a complete protein on collagen vs whey protein.
What that means for this page's question is blunt. In both trials creatine was bundled with whey, so neither can say what creatine contributed. And in both trials collagen was the thing expected to do less, so neither says anything about the two together.
Where the chemistry connects them
There is one genuine biochemical link, and it is the only reason the pairing is more than a coincidence of shelf placement. Creatine is made in the body from three amino acids. Brosnan and colleagues at Memorial University set out what each contributes: the entire glycine molecule, the amidino group of arginine, and a methyl group from methionine by way of S-adenosylmethionine (Brosnan, da Silva & Brosnan, Amino Acids 2011;40(5):1325–31, PMID 21387089). A 70 kg man aged 20 to 39 loses about 2 g (14.6 mmol) of creatine a day as creatinine, and roughly half of that is replaced from diet in people who eat meat.
Collagen is unusually rich in glycine. USDA FoodData Central lists unsweetened dry gelatin — the intact protein collagen peptides are hydrolysed from — at 19.0 g glycine, 6.62 g arginine and 0.606 g methionine per 100 g (FDC 169599). Running that composition through the stoichiometry gives this, for a 20 g serving:
| Precursor | In 20 g gelatin | Share of a day's creatine turnover (14.6 mmol) |
|---|---|---|
| Glycine | 3.80 g · 50.6 mmol | ~350% |
| Arginine | 1.32 g · 7.6 mmol | ~52% |
| Methionine (methyl donor) | 0.12 g · 0.81 mmol | ~6% |
Our calculation from the USDA figures, molar masses 75.07 (glycine), 174.20 (arginine), 149.21 (methionine). One mole of each precursor per mole of creatine. The shares ignore every other use the body has for these amino acids, so they are ceilings, not supplies.
On glycine alone, collagen looks like a creatine precursor supplement. The same paper removes that reading. Its authors conclude that creatine synthesis "does not appear to place a major burden on glycine metabolism in adults since this amino acid is readily synthesized." The burden they measured falls elsewhere: creatine synthesis accounts for about 40% of all labile methyl groups supplied by S-adenosylmethionine and 20 to 30% of arginine's amidino groups. Methyl groups are exactly what gelatin barely carries — about 6% of a day's creatine requirement in a 20 g serving.
So the one mechanistic story connecting the two supplements points at the precursor that is not limiting, and away from the one that is. No study has measured creatine synthesis, plasma creatine or muscle creatine after collagen intake, so the arithmetic above is where the evidence stops.
What each does on its own
The two are studied for different tissues, and this site covers each separately:
- Creatine is stored as phosphocreatine and buffers ATP during short, hard efforts. Its best-supported effects are on high-intensity performance and, with training, on lean mass — though how much of that mass is tissue rather than water is contested, as we lay out in what creatine is.
- Collagen peptides are studied mainly for connective tissue and recovery. For muscle growth, the trials that compared collagen with whey found whey ahead or no difference, which we trace on collagen peptides for muscle growth. For soreness, placebo-controlled trials split along funding lines: a 2023 crossover trial in 20 middle-aged men found lower soreness scores on 10 g a day, and five of its six authors are employed by the gelatin maker Nippi (Kuwaba et al., J Int Soc Sports Nutr 2023, PMID 37133292); the comparator trials are on collagen peptides for muscle recovery.
Neither literature predicts an interaction. Neither rules one out, because nobody has looked.
What can honestly be said
- The combination is untested. Zero trials have given creatine and collagen peptides together against either alone.
- The two trials that used both put them on opposite sides, and bundled creatine with whey, so they measure neither creatine alone nor the pair.
- Collagen supplies glycine in excess of creatine turnover, but glycine is not the limiting precursor in adults, according to the researchers who quantified the pathway.
- Collagen supplies little of the methyl groups that creatine synthesis actually strains — about 6% of a day's requirement in 20 g of gelatin, by our arithmetic from USDA data.
- Search interest has grown without evidence to match, and the trial that would settle the question — creatine, collagen, both and neither, with muscle creatine measured — has not been registered.
The same question has been asked of one other pairing, and answered slightly better. Creatine with HMB has five randomised trials in roughly 144 people, and they divide along an instructive line: the two independent trials in trained athletes found the combination added nothing. The larger pairing question — creatine alongside ordinary protein powder — has three trials with arms isolating each, which is still a thin base for the two best-selling products in the aisle.
This page reports what has and has not been studied. It contains no recommendation, and decisions about supplementation belong with a clinician.
Sources
- Wageh M, Fortino SA, McGlory C, Kumbhare D, Phillips SM, Parise G. The effect of a multi-ingredient supplement on resistance training-induced adaptations. Med Sci Sports Exerc 2021;53(8):1699–707 — PMID 33756525 · doi:10.1249/MSS.0000000000002641 · NCT03525197
- Nilsson MI, Xhuti D, de Maat NM, Hettinga BP, Tarnopolsky MA. Obesity and metabolic disease impair the anabolic response to protein supplementation and resistance exercise. Nutrients 2024;16(24):4407 — PMID 39771028 · doi:10.3390/nu16244407
- Brosnan JT, da Silva RP, Brosnan ME. The metabolic burden of creatine synthesis. Amino Acids 2011;40(5):1325–31 — PMID 21387089 · doi:10.1007/s00726-011-0853-y
- Brosnan ME, Brosnan JT. The role of dietary creatine. Amino Acids 2016;48(8):1785–91 — PMID 26874700 · doi:10.1007/s00726-016-2188-1
- Kuwaba K, Kusubata M, Taga Y, et al. Dietary collagen peptides alleviate exercise-induced muscle soreness in healthy middle-aged males. J Int Soc Sports Nutr 2023;20(1):2206392 — PMID 37133292 · doi:10.1080/15502783.2023.2206392
- US Department of Agriculture. FoodData Central: Gelatins, dry powder, unsweetened (SR Legacy, FDC 169599) — fdc.nal.usda.gov
All sources retrieved 2026-09-17. Digital object identifiers verified by content negotiation on the same date. PubMed and ClinicalTrials.gov counts are as of that date and will change.