Polynucleotides, Exosomes and Sculptra: A Guide to Regenerative Aesthetics

By Sonia Ike, Aesthetic Injector at Sisu Clinic

If you've been researching treatments that genuinely improve your skin rather than just mask what's happening underneath, you've probably come across the words polynucleotides, exosomes and Sculptra. They all fall under a category called biostimulators, and they're quietly reshaping how we approach facial ageing.

I get asked about these three almost every week in clinic, and so do my colleagues across our clinics in Ireland, the UK and the US. Patients want to know which one is right for them, how they actually work, and what results to expect. So I've put together a clear, honest breakdown of each. No jargon, no oversell.

What are biostimulators?

A biostimulator is an injectable that encourages your own skin to produce more collagen, elastin and extracellular matrix. That's the scaffolding that keeps your skin firm, plump and bouncy.

They don't add volume the way a traditional filler does. They trigger your body to rebuild its own structure from within. The results are gradual, more natural-looking, and in most cases, longer-lasting than a standard dermal filler.

Why does collagen matter?

From around age 30, the average person loses roughly 10% of their collagen per decade. In the face, this shows up as skin laxity, a loss of fullness around the cheeks and temples, and a softening of the features that used to look sculpted.

This is where the Ogee Curve starts to flatten. The Ogee is that soft S-shape that runs from the cheekbone down to the jaw when viewed from the side. It's one of the key structural features of a youthful face, and collagen loss is what breaks it down.

Biostimulators aim to slow that process and, in many cases, reverse some of it.

1. Polynucleotides

Polynucleotides are long chains of purified DNA fragments, most commonly derived from salmon or trout. When injected, they activate fibroblasts. Fibroblasts are the cells in your skin responsible for producing collagen and elastin, so waking them up is the whole point.
What polynucleotides are good for:

• Reducing fine lines and improving skin texture
• Hydrating the skin from within
• Calming inflammatory conditions like acne, rosacea and irritated skin
• Softening hyperpigmentation over time
• Treating delicate areas like under the eyes and the neck, where fillers can be too heavy

Polynucleotides have been used in aesthetic medicine for over a decade. South Korean skincare practitioners were the first to bring them into the mainstream, and the rest of the world has caught up quickly.
Our Sisu injectors typically deliver polynucleotides via fine-needle mesotherapy or cannula. You'll usually need a short course of three sessions spaced a few weeks apart, then a top-up every six to twelve months.

2. Exosomes

Exosomes are tiny vesicles that carry messages between cells. Think of them as couriers: they deliver signals that tell surrounding cells to repair, regenerate and calm down.

When applied to the skin, they trigger the same fibroblast activity that polynucleotides do, which means more collagen and elastin over time. They're also strongly anti-inflammatory, which makes them particularly useful for reactive or compromised skin.

What exosomes are good for:

• Accelerating skin healing after laser, microneedling or peels
• Improving overall skin texture, tone and radiance
• Reducing redness and inflammation
• Post-procedure recovery

Because exosomes are a newer treatment in aesthetics, it's especially important to have them administered in a medical setting with a trusted, regulated product. Ask your injector where their exosomes are sourced from.
Like polynucleotides, exosomes can be delivered by microneedling, mesotherapy, or injection with a fine needle or cannula.

3. Sculptra

Sculptra is poly-L-lactic acid, usually shortened to PLLA. It's the original biostimulator, and it's been around for over 20 years.
Contrary to what a lot of blogs will tell you, Sculptra is not a filler. It doesn't add volume directly. What it does is stimulate a significant amount of new Type I and Type III collagen over several months, which thickens the dermis and gradually restores volume to areas that have lost it.
What Sculptra is good for:

• Restoring volume to the cheeks, temples and jawline
• Rebuilding overall facial structure in patients with more advanced collagen loss
• Supporting the skin before or after a surgical facelift (many plastic surgeons use it for exactly this)
• Long-term anti-ageing results that can last up to two years

Patience is essential. You won't walk out of your first session with a dramatically different face, and that's the point. Results build over three to six months, and most patients need a series of sessions spaced around six weeks apart.

At Sisu, Sculptra is typically injected using a cannula along the lateral cheeks, temples and jawline, where structural support makes the biggest difference.
PLLA also has a long medical track record outside aesthetics. It's been used in public health systems for patients experiencing facial lipoatrophy from chronic illness, which is one of the reasons our injectors trust it so much.

A quick fun fact: many plastic surgeons inject Sculptra before and after a surgical facelift to support collagen production and give the surgical result better structural scaffolding.

What's the difference between polynucleotides, exosomes and Sculptra?
Polynucleotides and exosomes mainly improve skin quality, hydration and texture, and results show in two to four weeks. Sculptra rebuilds deep structural collagen and restores volume to the cheeks, temples and jawline, with results developing gradually over three to six months.

Advice from the Sisu injector team

The single most important thing you can do for your skin is have a solid, well-formulated skincare routine. Every injector in our team says the same thing to their patients. A good routine lays the foundation, and aesthetic treatments build on top of it.

Biostimulators are powerful, but they work best in skin that's already being looked after day to day. Sunscreen every morning, a retinoid at night (if tolerated), and a barrier-supportive moisturiser will amplify everything you invest in treatment-wise.

And please, do your research. Aesthetics is collaborative. It's a partnership between you and your injector, and the best results come from honest conversations about what you want, what's realistic, and what your skin actually needs.

Sonia Ike is an aesthetic injector at Sisu Clinic. To book a consultation with any of our Ireland-based injectors and discuss whether polynucleotides, exosomes or Sculptra is right for you, visit sisuclinic.com.