Collagen is the skin’s structural protein, the very framework that keeps our complexion smooth, plump and youthful-looking. But as we age, our natural collagen levels steadily decline. It’s no surprise, then, that collagen has become such a hot topic in skincare, with countless products promising to “boost” or even “replenish” collagen.
What is collagen?
Collagen is the most abundant protein in the human body, acting as the main building block for skin, bones, muscles, tendons, ligaments, and even hair. Within the skin, collagen is produced naturally in the dermis - the middle layer - where specialised cells create fibres that provide strength, elasticity, and structure. Think of it as the skin’s scaffolding, helping to keep the surface smooth, plump and firm. However, this vital protein isn’t limitless: collagen production gradually slows with age, leading to visible changes in the skin’s appearance.
The different types of collagen
There are at least 28 types of collagen in the body, but only a few play a major role in skin health and visible ageing.
Type I collagen is the most abundant, accounting for around 90% of the body’s total collagen. It’s the primary structural collagen in the skin, providing firmness, strength, and resilience; the hallmarks of youthful skin.
Type III collagen works closely alongside Type I. It’s essential for maintaining skin elasticity and suppleness, especially in younger skin, and plays a key role in wound healing.
Type IV collagen, meanwhile, is found deeper within the skin’s architecture (forming part of the basement membrane that connects the outer and inner skin layers). While it doesn't contribute directly to firmness or elasticity, it plays an essential role in skin barrier function and cohesion.
Less talked about but equally important, Type V collagen works behind the scenes to organise and regulate the formation of collagen fibres; ensuring Types I and III are properly structured and stabilised within the skin. It’s a key player in maintaining the integrity and function of the skin’s support network.
While each type has its own role, together they form the supportive network that gives skin its plump, healthy appearance.
What collagen does for your skin (and why it matters)
A smooth, plump and youthful-looking complexion starts with a strong internal support system. That support comes from collagen fibres. These structural proteins keep skin feeling firm, elastic, and resilient. But as collagen naturally declines with age, you may notice skin becoming drier, thinner and less supple, often showing signs of sagging, fine lines, and wrinkles. Collagen also plays a key role in skin repair and regeneration, helping to maintain strength against daily stressors.
What causes collagen loss
From around age 25, our natural collagen production begins to decline by roughly 1% each year. While this gradual loss is a normal part of ageing, other external and lifestyle factors can speed up this process.
Sun exposure is a leading cause of collagen breakdown. UV rays penetrate deep into the skin, damaging collagen fibres and accelerate ageing. Environmental stressors like pollution and smoking add to the effect, while lifestyle factors such as poor diet, high sugar intake and stress can also take their toll. In particular, excess sugar triggers glycatio, a process that stiffens collagen fibres and reduces skin’s elasticity.
Collagen benefits for your skin
Boosting collagen isn’t just about smoothing lines, it’s about supporting the skin’s long-term strength, resilience and youthful function as it ages.
Smoother, firmer skin
Collagen works hand in hand with elastin to maintain the skin’s structure and bounce. When collagen levels are healthy, skin appears taut, lifted and resilient. By supporting collagen and elastin, you can help improve skin elasticity, reduce sagging and achieve a firmer, more youthful-looking complexion.
Reduced fine lines and wrinkles
A natural decline in collagen makes skin thinner and more prone to creasing. By stimulating collagen production, skin looks plumper and smoother. Harnessing collagen for wrinkles helps smooth away visible lines, from crow’s feet to smile lines, while reinforcing skin’s strength to prevent deeper wrinkles from forming over time.
Improved skin texture
Healthy collagen levels are key to maintaining a smooth, even skin surface. By boosting collagen, you can refine texture, minimise rough patches and reduce enlarged pores. Over time, collagen support also helps soften post-acne marks and scars, revealing a clearer, more polished complexion.
Enhanced hydration retention
Collagen plays a vital role in supporting the skin barrier, helping it lock in moisture more effectively. With stronger collagen levels, skin appears dewy, supple and comfortable, while improved hydration helps prevent dryness, flaking and a lacklustre complexion.
Long-term ageing prevention
Consistently supporting collagen helps future-proof your skin, maintaining structure and resilience over time. By defending against premature ageing from sun, stress and pollution, collagen support delivers cumulative, visible results, promoting long-term skin health and longevity for a smoother, firmer, more youthful-looking complexion.
Brighter, more youthful appearance
Rising collagen levels help skin appear fresher, more radiant, and full of life. By promoting a more even tone, reducing dullness, and enhancing the skin’s natural vitality, collagen contributes to a healthy glow and a naturally youthful complexion.
Restoring your skin's collagen
While natural collagen loss can’t be completely reversed, there are ways to stimulate collagen and improve its appearance. Skin has the ability to produce new collagen when given the right support, and targeted treatments and lifestyle choices can make a real difference.
Collagen-boosting skincare plays a crucial role in maintaining structure, firmness, and overall skin health.
Written by: Radhika Sen