Everything You Need To Know About Peptides For The Skin, According To A Dubai Functional Medicine Doctor

Peptides. These are the skincare industry’s favourite ingredients right now.

Known to be tiny protein powerhouses, they are rewriting beauty rules, smoothing lines, boosting glow, and flexing anti-ageing magic like Hollywood muscle. They are an aesthetician and dermatologist’s favourite for healing skin, slowing ageing, and stimulating collagen and elastic production.

But, just like with any new development in the beauty industry, the information can sometimes be overwhelming. So, to cut through the noise, GRAZIA sat down with Dr. Nathan Curran (DNC), an innovative medical practitioner specialising in longevity, regenerative medicine, and functional health optimisation at Biolite clinic in Dubai, to bring you everything you need to know about this revolutionary development in skincare.

DNC: Your body contains roughly 37 trillion cells and every single one of them needs to know what to do, when to do it, and how to coordinate with the cells around it. The way the body manages that extraordinary feat of coordination is through signalling molecules — hormones, neurotransmitters, and peptides. Think of them as an internal communication network that keeps 37 trillion moving parts functioning in harmony for the good of the larger organism.

Peptides are a crucial part of that network. They’re short chains of amino acids; the same building blocks that make up proteins and their job is to deliver precise instructions to specific cells. Some tell your skin to produce more collagen. Others instruct your muscles to repair, or nudge your pituitary gland to release more growth hormone.

As we age, that signalling network starts to drift. The messages get quieter, less frequent, and less precise, particularly from our late twenties onward. And when the signals that govern repair, regeneration, energy, and metabolism begin to fade, the downstream effects are exactly what we associate with ageing: slower healing, less resilient skin, declining energy, and shifting body composition. That signal drift is biological ageing, or at least a major driver of it.

DNC: It depends on the peptide, the goal, and crucially, how receptive your body’s internal terrain is to the signal you’re amplifying.

That last part is really important, and it’s something most conversations about peptides skip over entirely. Peptides work by sending a specific instruction e.g. repair this tissue, produce more collagen, release more growth hormone. But if the environment they’re signalling into is hostile (due to chronic inflammation, poor sleep, environmental toxicity) the message doesn’t land properly. Think of it like trying to have a conversation in a noisy restaurant – the signal is there, but the background noise drowns it out.

When the terrain is favourable, some effects are surprisingly fast. Patients on growth hormone–releasing peptides often notice better sleep and faster recovery within the first seven to ten days. That’s because you’re restoring a signalling pathway that was already there but had simply dulled over time and if there’s nothing blocking the signal, the body responds quickly.

Skin-specific results tend to build more gradually. Collagen synthesis is a remodelling process, not an overnight fix, so most people begin to see visible improvements in texture, firmness, and glow at around the four-to-six-week mark, with compounding benefits over three to six months.

DNC: Each of those concerns has a different underlying driver, but before I get into specifics, there’s something worth stepping back to appreciate: pigmentation, fine lines, and dullness aren’t just “skin problems.” They’re skin-based manifestations of biological ageing that’s happening systemically across your entire body. In this context, your face is essentially a biological ageing scorecard. It’s showing you, in real time, how the major drivers of ageing — chronic inflammation, metabolic dysfunction, oxidative stress are progressing beneath the surface. The skin is your largest organ by weight, and it’s exquisitely sensitive to what’s happening internally. That’s why any intervention that positively influences those systemic drivers will also produce visible skin benefits.

Fine lines and loss of firmness respond best to collagen-stimulating peptides. GHK-Cu is my first choice, and for expression lines specifically Acetyl Hexapeptide-8 applied topically twice daily is a great add-on.

Pigmentation and uneven tone are typically driven by low-grade inflammation, UV exposure, and overactive melanin production. GHK-Cu plays a strong role here too — its antioxidant and anti-inflammatory properties help calm the cascade that triggers excess pigmentation. I’ll often layer this with targeted antioxidant support (like glutathione IV therapy) and a well-formulated topical regimen to tackle pigmentation from multiple directions at once.

Dullness is almost always a circulation and cell turnover issue — the skin looks flat because renewal has slowed and blood flow to the surface isn’t what it should be. BPC-157 tackles the circulation side by promoting the formation of new blood vessels, bringing more oxygen and nutrients to the skin and restoring that natural vitality flush that dull skin is missing. From mid-life onwards adding a Growth hormone–releasing peptides address the turnover side directly, restoring that youthful GH pulse accelerates cell renewal so fresh, healthy skin cells reach the surface faster. Lifestyle factors matter enormously here too: sleep quality, hydration, and inflammatory and toxin load all directly affect luminosity.

DNC: They are fundamentally different in philosophy. I see facials as skin maintenance – they support the skin’s surface barrier, improve product absorption, and provide a reset. Valuable, but not regenerative per se. Lasers and microneedling create controlled damage to kickstart a healing response — effective for texture and pigmentation, but you’re relying on your skin’s existing repair capacity to deliver results. Injectables like filler and Botox are corrective. They address the symptom ie the line, the volume loss, rather than the biology driving it. While they have value optically, they don’t change the biological trajectory of how your skin is ageing.

Peptides sit upstream of all of that. They enhance the biological machinery itself: your collagen production, your growth hormone output, your antioxidant defence, your rate of cell renewal. When you optimise those systems first, everything else works better. Your skin responds more robustly to laser. Your facials deliver more visible results. You need less filler because your skin is genuinely thicker and better hydrated. It’s the difference between redecorating a building and strengthening the foundations it sits on. In longevity medicine, I always start with the foundations.