What Is a Collagen Glow Up? The Science Behind It
Scarlett Gray
BNutrDiet (Hons), APD, SDA
Accredited Practising Dietitian with Dietitians Australia (APD200526). Accredited Sports Dietitian and Credentialled Eating Disorder Clinician. First Class Honours in Nutrition and Dietetics from the University of Newcastle.
What is a collagen glow up? The science behind the transformation
The term "collagen glow up" describes the visible improvement in skin quality that happens when collagen production is supported consistently over time. You'll see it referenced frequently on social media alongside before-and-after photos — but there is genuine science behind the transformation. Understanding what's actually happening in your skin helps explain why the results look the way they do. For the complete guide to liquid marine collagen supplementation, read our best marine collagen UK guide.
What changes during a collagen glow up?
Collagen is the primary structural protein in the dermis — the layer of skin beneath the surface. It makes up approximately 75% of the dry weight of skin and is responsible for its density, firmness, and ability to retain water. As collagen production begins to decline from around the mid-twenties, skin gradually becomes thinner, loses its bounce, and retains less moisture. The visible result over time is a duller, flatter complexion with more visible lines.
When you supplement with marine collagen peptides at a clinically studied dose of around 10,000mg daily, you're providing bioactive peptides rich in glycine, proline, and hydroxyproline — the signature amino acids of collagen. Rather than simply supplying raw building blocks, these small peptides are absorbed intact into the bloodstream, where they act as signalling molecules that stimulate fibroblasts to produce new collagen and hyaluronic acid, while also helping to slow the enzymes that break down the dermal matrix. Over 8–12 weeks of consistent use, this can translate into visible changes: improved skin hydration, elasticity, and a modest reduction in fine lines and wrinkle depth.
Meta-analyses of randomised controlled trials also report improvements in skin hydration and elasticity with consistent collagen peptide supplementation, reinforcing the evidence base above.
The collagen glow up timeline
| Week | What you may notice |
|---|---|
| Weeks 1 to 2 | Some people report improved skin hydration and a subtle brightness. Individual responses vary. |
| Weeks 4 to 6 | Emerging clinical trial evidence for visible plumpness and improved skin texture; some customer reports of reduced fine lines and better bounce. |
| Weeks 8 to 12 | The window where most clinical trials measure significant improvements in skin hydration and elasticity. Many customers also report stronger nails and reduced hair shedding. |
| Beyond 12 weeks | Continued daily use supports sustained improvements in skin density and elasticity. |
Why marine collagen is a strong fit for skin outcomes
Marine collagen is predominantly Type I — the same type that dominates in human skin — which is one reason it's the most commonly studied source for skin outcomes. It's derived from fish skin as a by-product of the fishing industry, hydrolysed into small peptides for absorption. Marine collagen also has a strong safety profile, and the research base around marine collagen for skin outcomes has grown substantially in the last few years, including the 2024 review in the Journal of Cosmetic Dermatology. For a broader look at marine vs bovine collagen, read our marine vs bovine collagen guide.
Kollo delivers 10,000mg of Naticol® marine collagen per daily sachet — the dose used in clinical research — alongside vitamin C, B-vitamins and l-lysine. Vitamin C contributes to normal collagen formation for the normal function of skin: what matters for the body's collagen synthesis is adequate vitamin C in your overall diet rather than the specific amount alongside your collagen serve. Every batch of Kollo is Informed Choice certified, meaning it's independently tested for over 250 prohibited and potentially harmful substances. Marine collagen is not suitable for anyone with a fish allergy.
- 10,000mg Naticol® marine collagen per sachet — the dose used in the clinical research
- Vitamin C, B-vitamins and l-lysine included; adequate vitamin C in your overall diet supports the body's collagen synthesis
- Clinical trials typically show measurable skin improvements at 8-12 weeks of consistent daily use
- Informed Choice certified — every batch independently tested for purity
Featured Product
Premium Liquid Marine Collagen
10,000mg of clinically studied Naticol® marine collagen daily — the dose used in the research.
Shop Now →Who sees the most dramatic collagen glow up?
The visible transformation tends to be most striking in women aged 40 and over — and there is a clear biological reason for this. As oestrogen declines in perimenopause and menopause, skin collagen loss accelerates sharply. Women in this life stage are starting from a lower collagen baseline, meaning supplementation has more room to produce measurable improvement. That said, clinical trials show meaningful skin improvements across all adult age groups — the glow up isn't age-restricted, it's dose- and consistency-dependent.
Consistency matters. Clinical studies showing improvements in skin typically involve daily collagen supplementation, and many customers who report the most noticeable changes also say they take their 10,000mg dose every day without missing servings. Read more about when to expect your results in our guide to how long before marine collagen works.
Does stopping collagen reverse the glow up?
What happens next depends on how long you supplemented and at what dose. In one clinical trial, participants who stopped taking lower-dose collagen peptides (2.5g/day) after 12 weeks saw skin hydration, elasticity, and dermal density decline by roughly 30–45% over the following 12–16 weeks. However, studies using higher doses found that improvements in dermal thickness and density were maintained even after a four-week washout period — suggesting that longer and higher-dose supplementation may produce more durable structural changes. The results built over months of consistent supplementation don't disappear overnight, but without continued daily intake, they are unlikely to be permanent. This is why Kollo is designed as a daily supplement rather than a one-off purchase.
Does collagen make your coffee taste different?
Unflavoured hydrolysed collagen peptides are near-tasteless in coffee — most people report noticing no change in flavour at all. The texture may be very slightly thicker at a full 10,000mg dose, but this is imperceptible to most. Some collagen powders have a mild protein smell when the sachet is opened, but this dissipates immediately in hot liquid. In customer feedback, marine collagen tends to be one of the more neutral-tasting options — though this is subjective and varies by product and individual. If you're using a flavoured collagen powder, choose a neutral flavour like unflavoured or vanilla to complement rather than clash with your coffee.
The combination of collagen and coffee is one of the simplest ways to build a consistent daily habit. Combining it with an existing non-negotiable morning routine — the coffee you were going to make anyway — removes the need for any additional behaviour change. For the full breakdown of optimal collagen timing, read our guide to the best time to take collagen.
Explore Kollo's Complete Guides
For more depth on any area of your routine: complete guide to liquid marine collagen, complete guide to collagen powder, complete guide to menopause supplements, complete guide to creatine, and complete guide to electrolytes.
Kollo Health was co-founded by Jenni Falconer — TV presenter, Smooth Radio breakfast host, ten-time London Marathon runner and host of the RunPod podcast. Read her story and why she created Kollo.
