What is collagen?
If you spend any time in the skincare aisle, you could be forgiven for thinking collagen in a jar is the shortcut to firmer, younger skin. Collagen is the most abundant structural protein in our skin. Think of it as the dense, springy scaffolding that keeps skin plump, resilient, and resistant to sagging.
From our mid-twenties onward, our bodies produce less of it each year, which is why skin gradually loses its youthful firmness over time. Many products promise to "rebuild" or "refill" our collagen from the outside in. But biologically, collagen is a very large protein, and our skin barrier is designed to keep large molecules out, not invite them in. That mismatch between biology and marketing is where confusion starts.
Image 1: Collagen structure in younger skin versus older skin (Credit: Freepik)
Most forms of collagen cannot penetrate the skin
Many traditional collagen creams rely on intact collagen or large collagen fragments that mostly sit on top of the skin. They can act as moisturizers and film-formers, helping the surface feel smoother and better hydrated, but they are unlikely to travel all the way down to our dermis (Jadach et al., 2024).
What does the scientific evidence on collagen say?
There are certain engineered forms of collagen can do more than just sit on the surface. For example, when collagen is processed into tiny, skin-penetrable structures and paired with an appropriate base, it can contribute to visible changes in skin quality (Lubart et al., 2022). Collagen sheet masks containing soluble collagen peptides and showing a fibrillar structure comparable to human dermis have also been shown to produce significant improvements in our skin (Janssens-Böcker et al., 2024).
Image 2: Image of sheet mask (Credit: Dupe)
Are oral forms of collagen more effective?
In fact, the form of collagen with the most extensive literature and the most impressive results is not topical, but oral. Ingested hydrolyzed collagen peptides can measurably improve skin hydration and elasticity compared with placebo, likely by providing amino acid building blocks and signaling peptides from within (Pu et al., 2023).
What is the take-home message on collagen in skincare?
Topical collagen still has a relatively small evidence base and claims of deep "collagen rebuilding" in skincare products are more likely to be marketing than mechanism. We may still get a pleasant, hydrating product, but it is the humectants, emollients, and barrier-supporting lipids doing the heavy lifting. Daily sunscreen, proven actives such as high-quality peptides, and a barrier-friendly routine still carry the strongest evidence for preserving firmness over time. That is the smart strategy.
References
- Jadach B, Mielcarek Z, Osmałek T. Use of Collagen in Cosmetic Products. Current Issues in Molecular Biology. 2024. Available here: https://pmc.ncbi.nlm.nih.gov/articles/PMC10968853/
- Lubart R, Yariv I, Fixler D, Lipovsky A. A Novel Facial Cream Based on Skin-penetrable Fibrillar Collagen Microparticles. The Journal Of Clinical And Aesthetic Dermatology. 2022. Available here: https://pmc.ncbi.nlm.nih.gov/articles/PMC9122277/
- Janssens-Böcker C, Wiesweg K, Doberenz C. Native collagen sheet mask improves skin health and appearance: A comprehensive clinical evaluation. Journal of Cosmetic Dermatology. 2024. Available here: https://pubmed.ncbi.nlm.nih.gov/38279521/
- Pu SY, Huang YL, Pu CM, Kang YN, Hoang KD, Chen KH, Chen C. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023. Available here: https://pmc.ncbi.nlm.nih.gov/articles/PMC10180699/
This post is for informational purposes only and is not a substitute for professional medical advice.
