Are biostimulators safe?

In the hands of a qualified medical injector using a regulated product, yes. All three have solid safety profiles. Most patients experience nothing more than brief swelling, bruising or tenderness at the injection sites for a day or two.

How long will results last?

Polynucleotides and exosomes generally hold for six to twelve months. Sculptra's results can last up to two years because the collagen your body produces in response is your own tissue.

When's the right time to start?

Your early to mid-thirties is a common starting point because that's when collagen loss meaningfully accelerates. Starting early is often framed as preventative. That said, biostimulators are genuinely effective well into later decades, and many of our best patient results come from people in their forties, fifties and sixties.

Can biostimulators be combined with other treatments?

Yes, and in most cases they should be. They pair well with anti-wrinkle injections, skin boosters, laser, microneedling, and any serious medical-grade skincare routine. A good injector will sequence things deliberately.

Are biostimulators a replacement for filler?

No, they do different jobs. Filler provides instant, targeted volume. Biostimulators rebuild your own tissue over time. The two categories often work best together, not instead of each other.

What's the recovery like?

Minimal for all three. You can return to normal daily activity the same day. Some mild swelling or small bruises are possible in the first 24 to 72 hours, nothing that should interrupt your week.

How quickly will I see a difference?

Polynucleotides and exosomes typically show visible improvement within two to four weeks. Sculptra is a slower build, with the main results developing over three to six months as new collagen forms.

One thing I always tell my patients

Every injector on our team agrees on this one: skincare is the foundation, and no injectable will carry a neglected routine. SPF every single morning, a retinoid at night if your skin tolerates it, and a moisturizer that supports your skin barrier. That's the baseline. Biostimulators become substantially more effective when they're going into skin that's already being properly looked after. The other thing is to ask questions. A good aesthetic practice welcomes them. The best results I see come from patients who walk in knowing what they want, are open about what they don't, and treat the consultation as a real conversation with their injector.

Polynucleotides vs Exosomes vs Sculptra: Which Is Right for You?

By Sonia Ike, Aesthetic Injector at Sisu Clinic

There's a shift happening in aesthetic medicine, and it's worth understanding. Instead of simply adding volume or smoothing lines, a growing category of treatments works by getting your own skin to repair and rebuild itself. These are biostimulators, and the three most talked-about right now are polynucleotides, exosomes and Sculptra.

Patients walk into our Sisu Clinic locations asking about them every day. In New York, in Houston, in Dublin, in London. The questions are almost always the same: what are these, how are they different from filler, and which one should I actually be considering? Here's the breakdown I wish more patients had before their first consultation.

Collagen is the real story

Before we get into the three treatments, it helps to understand why biostimulators exist at all.
Collagen is the protein that gives your skin its firmness, bounce and structural integrity. Starting in your early thirties, you lose roughly 10% of it per decade. By your forties, that compounding loss starts to show up as softer features, laxity along the jawline, hollowing under the eyes, and a flattening of the cheekbones.

There's a specific facial contour called the Ogee Curve, the gentle S-shape running from your cheekbone down to your jaw when seen in profile. It's one of the defining features of a youthful face, and it's usually the first structural signal to go when collagen starts depleting.
Biostimulators are designed to intervene in that process. Rather than replacing what's been lost from the outside, they prompt your body to produce more of it from the inside.

How biostimulators differ from fillers

This is the single biggest misconception worth clearing up. A traditional hyaluronic acid filler adds volume to a specific area the moment it's injected. It's immediate, it's visible, and it's temporary.

A biostimulator works on a different timeline and through a different mechanism. It activates your skin's own collagen-producing cells, called fibroblasts, and the visible change comes weeks or months later as your body builds new tissue. The results tend to look more natural because, in a very real sense, the improvement is your own skin.

Now the three treatments themselves.

Polynucleotides

Polynucleotides are purified chains of DNA fragments, typically sourced from salmon or trout. Injected into the skin, they wake up fibroblasts and kickstart collagen and elastin production. They also deliver real hydration at the cellular level, which is part of why the skin-quality improvements show up so quickly.

Patients who do well with polynucleotides tend to have concerns like:

• Crepey skin under the eyes
• Fine lines starting to set into the skin
• Dehydration that doesn't respond to topical products
• Acne scarring or active inflammation from rosacea
• Early pigmentation changes
• Thin-skinned areas like the neck and décolletage that can't tolerate heavier treatments

Polynucleotides have been around in aesthetic medicine for more than a decade, and their roots are in Korean skincare, which has always led the way on skin-quality-first treatments. They're usually delivered as a short course of three sessions a few weeks apart, with maintenance every six to twelve months depending on how your skin responds.

Exosomes

Exosomes are the newer arrival, and they work on a completely different principle. Every cell in your body releases tiny vesicles that carry messages to surrounding cells. Signals to repair damage, reduce inflammation, regenerate tissue. Exosomes in aesthetic treatments harness this messaging system and amplify it.
Clinically, they sit close to polynucleotides in terms of what they treat: skin quality, tone, texture, healing. Where they really stand out is in two situations:

• Post-procedure recovery. Exosomes are widely used after laser, microneedling or chemical peels because they dramatically speed up how quickly your skin calms down and rebuilds.
• Reactive or compromised skin. Patients whose skin runs hot, irritated or inflamed often respond beautifully to exosomes because of how strongly anti-inflammatory they are.

Because exosomes are a relatively new treatment category, sourcing matters enormously. Always ask your injector where the product comes from and whether it's regulated for use in your market. At Sisu, this is a question we answer before a patient even has to ask it.

Sculptra

Sculptra is the one that's been around the longest, and it plays a different role than the other two.
The active ingredient is poly-L-lactic acid, or PLLA, and it's often misunderstood. Sculptra is not a filler. It doesn't add volume the day you're treated. What it does is stimulate a substantial, sustained increase in your own Type I and Type III collagen over the following months, which gradually thickens the dermis and restores the deeper structural volume that collagen loss takes away.
The patients I recommend Sculptra to are usually dealing with:

• Flattening cheekbones
• Hollowing at the temples
• A softening jawline that's losing its definition
• Generalized facial thinning in their forties and beyond

Sculptra takes patience. You're not going to walk out of your first appointment and see a transformation. Most patients need a series of three sessions spaced about six weeks apart, and the real payoff lands three to six months later when the new collagen has laid itself down. Results can hold for up to two years, which is unusually long for an injectable.

A detail most patients don't know: plastic surgeons routinely use Sculptra around facelift surgery. It's injected before and sometimes after the procedure to give the surgical result a stronger collagen foundation. PLLA also has decades of medical use outside of aesthetics, particularly in patients experiencing severe facial fat loss from chronic illness, which is part of why I have so much confidence in its safety profile.

At Sisu, Sculptra is typically delivered via cannula along the lateral cheeks, temples and jawline. The cannula technique minimizes trauma and allows even product distribution.

A realistic way to choose between them

If you're trying to work out which of the three is actually right for you, here's how I'd frame it:
Start with polynucleotides if what bothers you most is skin quality. Texture, fine lines, hydration, tone. This is also the go-to for delicate areas.

Consider exosomes if you're already doing other treatments and want to amplify recovery and results, or if your skin is reactive and traditional approaches have been too harsh.
Look at Sculptra if the issue is structural. Volume that's gone, contours that have softened, a face that looks like it's lost its scaffolding.

A lot of patients end up combining them in sequence. Sculptra first to rebuild the foundation, then polynucleotides or exosomes layered on to refine skin quality. This is often where the most beautiful, natural-looking results come from, and it's the approach I take most often when building a long-term plan with a patient.

Sonia Ike is an aesthetic injector at Sisu Clinic. To book a consultation with any of our US-based injectors in New York City, Houston or Florida, and find out whether polynucleotides, exosomes or Sculptra is right for you, visit sisuclinic.com.