Collagen is simple, safe, and well-studied, and the evidence increasingly supports its ability to improve markers of skin health. A 2025 randomized controlled trial adds to this picture — and also settles an important question about which source of collagen delivers the best results.
Table of Contents
- What the research already shows
- The new study
- Protein versus peptide
- Other evidence-based tools for skin health
- References
What the research already shows
Think of collagen as the scaffolding that provides structure in muscles, bones, tendons, and skin. In the skin specifically, collagen forms a network that supports the outer layer, giving it firmness and elasticity [1].
Specialized cells in the skin, called fibroblasts, produce collagen and elastin — both key components for elasticity. As the body ages, those fibroblasts become less active. Collagen production declines by around one to one-and-a-half percent per year from early adulthood, and existing collagen breaks down more quickly. This process is accelerated by lifestyle factors such as smoking and sun exposure [1].
With less collagen, the skin begins to lose firmness and elasticity, and wrinkles and sagging appear. That raises a natural question: can supplementing with collagen counteract this age-related loss?
Research suggests yes. Supplementing with collagen peptides has been shown to boost skin hydration and elasticity through cellular changes in the collagen-containing layer of the skin. Collagen peptides are essentially collagen proteins broken down into smaller chains of amino acids — a form that the body can absorb and use efficiently.
A common criticism is that if collagen peptides are just amino acids, eating enough dietary protein should deliver the same benefit. That question is addressed directly in the protein-versus-peptide section below. First, here is a summary of the existing trial evidence.
A randomized controlled trial published in 2022 tested the effects of collagen peptides on wrinkles and skin quality over twelve weeks. Participants taking collagen peptides showed significant improvements in wrinkles, skin roughness, elasticity, and moisture compared with placebo [2].
This finding is not limited to one or two studies. A large meta-analysis published in 2023 reviewed twenty-six randomized controlled trials and concluded that collagen supplements significantly improve skin hydration and elasticity [3].
Since that meta-analysis, four additional trials have reported similar results. For example, a February 2024 study measuring participants at four, eight, and twelve weeks found significant improvements in wrinkle size, elasticity, and hydration in those taking collagen peptides [4].
One important question has emerged from this body of evidence: collagen peptides can be sourced from fish, cows, pigs, or chickens. Effect sizes differ among studies, leading some researchers to suggest that certain sources work better than others [3].
The new study
If source genuinely matters, identifying the most effective option has practical implications for anyone considering supplementation. The authors of this new 2025 trial set out to answer exactly that question.
Most earlier trials used fish or pig collagen. These researchers used collagen sourced from cows (bovine). They ran a randomized, double-blind, placebo-controlled trial with 66 women aged 35 to 55, lasting eight weeks. Outcomes measured included eye wrinkle volume, skin elasticity, and skin hydration [5].
Precision instruments captured three-dimensional images of a selected wrinkle, measured how quickly skin rebounded after stretching, and assessed surface hydration via electrical capacitance [5].
1. Results
- Wrinkles: Eye wrinkle volume fell approximately 9% at four weeks and a striking 25% at eight weeks relative to placebo. One participant saw a 51% reduction [5].
- Elasticity: Skin elasticity improved 6% at four weeks and 9% at eight weeks [5].
- Hydration: Skin hydration increased 26% by week eight [5].
2. Cellular insights
To explore the mechanism, the research team cultured human fibroblasts and exposed them to the same collagen peptides used in the trial. Production of collagen, elastin, and proteoglycan all rose significantly [5]. These cellular changes are consistent with the clinical benefits observed in participants.
3. Implications for collagen source
Despite using bovine collagen, the magnitude of improvement matched that seen in studies using fish or pig collagen [5]. The authors conclude that effectiveness does not appear to depend primarily on the animal species. Instead, differences between studies may stem from how peptides are produced — particularly molecular weight distribution and processing methods [5].
Protein versus peptide
Collagen peptides are chains of amino acids, so why not just eat more protein from food? The key lies in absorption. Short peptides are absorbed intact through intestinal peptide transporter one, whereas intact proteins must be fully digested into individual amino acids first [6] [7]. This means collagen peptides can enter the bloodstream quickly and may reach skin tissue in forms that directly stimulate fibroblast activity.
Direct evidence comes from a 2020 randomized trial in burn patients. One group received collagen peptides and another received a matched dose of soy protein. The collagen peptide group healed significantly faster, with a hazard ratio of 3.7 [8]. This finding suggests that collagen peptides offer benefits that go beyond ordinary dietary protein intake.
For those considering supplementation, the research indicates that the original animal source appears less critical than previously thought. What may matter more is the production process and molecular weight profile of the peptides.
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Other evidence-based tools for skin health
Collagen peptides are not the only well-researched approach to supporting skin health as the body ages.
4. Hyaluronic acid
Youthful skin relies on hyaluronic acid, a molecule with an extraordinary ability to retain moisture. Levels decline sharply with age; a 75-year-old has roughly a quarter of the hyaluronic acid found in the skin of a 19-year-old [9].
Multiple clinical trials show that oral hyaluronic acid supplements can improve hydration and reduce wrinkles. A 2021 double-blind trial reported an 18.8% reduction in wrinkle depth versus 2.6% with placebo [10].
A larger 2023 trial with 129 participants confirmed significant gains in hydration, skin tone, and epidermal thickness with oral hyaluronic acid supplementation [11].
5. Daily sunscreen
Repairing existing damage is valuable, but preventing further damage matters even more. Ultraviolet radiation from the sun breaks down collagen and elastin, leading to sagging, spots, and increased skin cancer risk. A well-known case study shows a 92-year-old who wore sunscreen on her face but not her neck for 40 years — the contrast in skin aging between the two areas is striking [12].
In a landmark 2013 randomized trial of 903 adults, those who used sunscreen every day showed no detectable increase in skin aging after four-and-a-half years [13]. A 2016 follow-up study found that daily sunscreen use not only halts but may actually reverse visible photoaging [14]. A broad-spectrum sunscreen of SPF 50 or higher, used each morning, is one of the most evidence-supported steps for long-term skin health.
References
1. https://www.oaepublish.com/articles/2347-9264.2020.153
2. https://pubmed.ncbi.nlm.nih.gov/36516059/
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC10180699/
4. https://pubmed.ncbi.nlm.nih.gov/37822045/
5. https://www.mdpi.com/2079-9284/12/2/79
6. https://www.sciencedirect.com/science/article/abs/pii/S0308814614002763
7. https://pubmed.ncbi.nlm.nih.gov/24767063/
8. https://pubmed.ncbi.nlm.nih.gov/31859087/
9. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5522662/
10. https://pubmed.ncbi.nlm.nih.gov/34933842/
11. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10661223/
12. https://onlinelibrary.wiley.com/doi/full/10.1111/jdv.17660
