Collagen vs creatine
These powders get stacked in the same tub and sold for the same selfie. The trials are about different outcomes. Creatine has been tested for lean mass and strength. Collagen has been tested against whey for muscle, and peptides have been tested for skin. We did not find a trial that put collagen and creatine on the same scoreboard.
| Question | Creatine monohydrate | Collagen peptides |
|---|---|---|
| What the trials actually measure | Lean mass and strength, mostly with lifting | Muscle size versus whey; skin trials are about peptides, not a creatine matchup |
| Head-to-head trial | We did not read one. They are not substitutes. | |
| Best-supported use | At least 5 g/day plus resistance training in the postmenopausal review | Not the better muscle-thickness choice versus whey in the trial below |
Creatine
In postmenopausal women, Naddafha 2026 (PMID 42141930) found +0.37 kg lean mass (5 trials, 338 people) and +7.5 kg on the leg press (3 trials, 111 people) with creatine, clearest at 5 g/day or more plus lifting. Bone density did not change. A 69-trial strength review (PMID 40944139) found bench and squat gains overall, and several of the sex-split gains only in men. Details are on creatine for women.
Collagen
Jacinto 2022 (PMID 35042187) randomized 22 untrained young adults to 35 g whey (3.0 g leucine) or 35 g collagen peptides matched for leucine with added free leucine, across 10 weeks of lifting. Whey increased vastus lateralis and biceps thickness more. Peak torque and power rose in both groups, with no difference between them.
Wageh 2024 (PMID 39475860) compared a multi-ingredient protein supplement with collagen during resistance training. Satellite-cell responses were mostly similar. The protein group had a greater increase in type II fiber size. That is still protein versus collagen, not collagen versus creatine.
A 2026 review of oral and topical peptides for skin (PMID 41924746) pooled 19 trials and 1,341 people. Wrinkles improved by a mean difference of 0.27 (p = 0.04), largely from oral polypeptides (mean difference 1.5, p = 0.01). Elasticity and density were inconsistent. Creatine was not the comparison, so this is not a win for collagen over creatine. It is a modest peptide-for-skin finding with a mixed product category.
Taking both
Nothing we read says they clash or that they must be taken together. If the goal is muscle, creatine plus lifting has the clearer human evidence, and whey beat collagen for muscle thickness. If the goal is skin, the peptide review is the relevant one, and it is not a creatine trial. See collagen vs whey.
Sources
- Naddafha S, et al. Creatine in postmenopausal women. PMID 42141930. DOI 10.1080/15502783.2026.2668435.
- Kazeminasab F, et al. Creatine and strength. Nutrients. 2025. PMID 40944139.
- Jacinto JL, et al. Whey versus collagen peptides. PMID 35042187. DOI 10.1123/ijsnem.2021-0265.
- Wageh M, et al. Multi-ingredient protein versus collagen. PMID 39475860. DOI 10.1249/MSS.0000000000003505.
- Nukaly HY, et al. Oral and topical peptides for skin aging. PMID 41924746.