Collagen is the protein most often invoked in skincare marketing, often with the least biological context. It is worth being specific about what it is, why it changes with age, and what actually moves it in published research.
Collagen in the dermis
Collagen is the main structural protein of the dermis. Type I makes up around 80% of dermal collagen; Type III around 15%, with smaller proportions of other types. These proteins are produced by fibroblasts — specialised cells that sit in the dermal matrix.
Collagen molecules are organised into fibrils, which bundle into fibres, which form a mesh that gives skin its tensile strength and resilience. Elastin (a related protein, produced by the same cells) provides the recoil that allows stretched skin to return to its original shape.
Healthy skin maintains this matrix by continuously producing new collagen while old collagen is broken down by enzymes called matrix metalloproteinases (MMPs). It is a turnover system. Visible aging happens when the balance tips toward more breakdown than synthesis.
What happens with age
Several measurable changes occur in the dermis over decades:
- Reduced fibroblast activity. Fewer fibroblasts produce less collagen.
- Decreased collagen synthesis of roughly 1% per year from age 20 onwards, in protected skin.
- Increased MMP activity, particularly in photoaged skin. UV exposure activates these enzymes, accelerating collagen degradation.
- Changes in collagen ratio, with a relative increase in Type III over Type I in aged skin.
- Disorganised elastin networks, particularly in photoaged skin (solar elastosis).
The visible result is the appearance of fine lines, loss of firmness, and the slow flattening of the dermal-epidermal junction.
What stimulates new collagen — by evidence strength
Several interventions have published evidence for stimulating dermal collagen. They are not equivalent.
Topical retinoids. Tretinoin and other retinoic acid derivatives are among the most rigorously studied skincare actives. Multiple controlled trials show measurable increases in dermal collagen and improvement in photoaged skin appearance over months of use. Mechanism: direct effect on keratinocytes and fibroblasts through retinoid receptor signalling.
Procedural treatments — microneedling, ablative and non-ablative lasers, chemical peels. These work by creating controlled wound-healing responses. Strong evidence for collagen induction, particularly with fractional ablative lasers. Higher cost, downtime, professional administration required.
Topical vitamin C. An essential cofactor for collagen synthesis. Evidence base for direct collagen stimulation in vivo is mixed, but it is reasonably well-established as an antioxidant that reduces the oxidative damage which accelerates collagen breakdown.
Peptides. Various peptide preparations (palmitoyl pentapeptide, copper peptides, others) have been studied with mixed but generally positive results. Mechanisms vary.
Photobiomodulation (LED red light). Multiple controlled trials report increased dermal collagen density after multi-week treatment courses. Mechanism: activation of fibroblast mitochondrial signalling pathways via cytochrome c oxidase absorption.
Lifestyle. The largest preventable accelerator of collagen loss is unprotected UV exposure. Daily sunscreen has more impact on long-term skin condition than most active treatments.
How to think about stacking
These interventions target overlapping but distinct pathways. They are generally additive, not redundant. The most evidence-supported routine for visible-aging concerns combines:
- Daily sunscreen to prevent ongoing damage.
- A topical retinoid at night to stimulate cellular turnover and collagen synthesis.
- An antioxidant in the morning to reduce oxidative damage.
- Photobiomodulation as a complementary, non-invasive stimulator of fibroblast activity.
- Periodic procedural treatments if warranted, on professional advice.
None of these are quick. Collagen turnover is measured in weeks to months.
The mask
A non-invasive collagen stimulator.
Redermis fires red wavelengths at the dermal layer where fibroblasts produce collagen and elastin. Ten minutes a session, integrated with your existing skincare.
Shop the maskReferences
Varani J, Dame MK, Rittie L, et al. Decreased collagen production in chronologically aged skin. American Journal of Pathology, 2006.
Mukherjee S, Date A, Patravale V, et al. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clinical Interventions in Aging, 2006.
Wunsch A, Matuschka K. A controlled trial to determine the efficacy of red and near-infrared light treatment. Photomedicine and Laser Surgery, 2014.
Redermis is a personal-care device, not a medical device. We make no claim to diagnose, treat, cure, or prevent any condition.