Filler vs. Skin Booster vs. Polynucleotides: Which One Does Your Face Need?

Quick answer:

 Match the treatment to the problem. Filler replaces lost volume and shapes features. Skin boosters add hydration to improve glow and fine lines. Polynucleotides support the skin’s own repair, which is why they are popular for thin, crepey, tired-looking skin. Many faces benefit from more than one, and a doctor can tell which problem is leading.

•    Filler is for structure and volume. Skin boosters are for hydration. Polynucleotides are for skin quality and repair.

•   Using the wrong one is the most common reason for disappointing results. Filler will not fix crepey skin, and a booster will not lift a hollow cheek.

•  Hyaluronic acid fillers have the most research behind them. Polynucleotide evidence is growing but mostly from smaller studies.

•    Many people combine them over time, with structure usually addressed first.

Dermal filler

Fillers are gels, most commonly hyaluronic acid, placed to restore volume, support and contour. They are used in areas such as the cheeks, chin, jawline, lips, under-eye hollows and for non-surgical nose shaping. HA fillers typically last around 6 to 18 months depending on the product and area, and can be dissolved with hyaluronidase if needed. Some fillers, such as Ellanse, are designed to stimulate collagen as well as add structure. Our injectables page covers the options we offer.

Skin boosters

Skin boosters are injectable hydrators, usually hyaluronic acid in a lower concentration or a lightly cross-linked form, placed into the skin rather than beneath it. They improve hydration, glow and the look of fine lines, but they do not add volume. Profhilo is often grouped with them, although it is a high-concentration HA designed to spread through tissue. Courses are usually two to three sessions with top-ups every few months.

Polynucleotides

Polynucleotides (PN) are purified DNA fragments, often derived from salmon, used to support the skin’s own repair. They are chosen for thin or crepey skin, texture, scarring and tired under-eyes. They do not add volume. Results tend to build across a course of sessions, with maintenance roughly every six months. Dr L’Art is an official UK partner for Rejuran, a polynucleotide treatment.

Side-by-side comparison

Which problem do you actually have?

Try this as a rough self-check in natural light. It is not a diagnosis, and most faces show a mix.

•       You see hollows, flatness or shadows. That points to volume loss, which filler addresses.

•       Your skin looks dry, dull or finely lined. That points to hydration, which a skin booster addresses.

•       Your skin looks thin, crepey, textured or scarred. That points to skin quality, which polynucleotides may help.

If you are not sure, a consultation will save you from treating the wrong thing. You can book one here.

When do they work best together?

Many clinicians address structure first, because restoring support can change how the skin above it sits, then work on skin quality. For example, someone with cheek hollowing and crepey under-eyes might have careful filler to the cheeks and a course of polynucleotides for the skin. The order depends on your goals, so treat this as a general pattern rather than a rule. For skin-quality options, see our skin treatments page.

Safety and evidence, honestly

•       Filler: the best-studied of the three. Serious complications such as vascular occlusion are rare but real, so choose a doctor-led clinic and ask about access to hyaluronidase.

•       Skin boosters: usually well tolerated. Small lumps or bruising can occur.

•       Polynucleotides: promising and increasingly used, but most studies are small and long-term data is limited. Avoid if you have a fish or salmon allergy, and during pregnancy.

Common mistakes to avoid

•       Using filler to fix skin quality, which can lead to overfilling.

•       Expecting a booster or polynucleotide treatment to add volume.

•       Choosing a treatment because it is trending rather than because it fits your concern.

•       Skipping a medical history and consultation.

Frequently asked questions

Do polynucleotides replace fillers?

No. They work differently. Polynucleotides support skin quality, while fillers restore volume. Some people need less filler once their skin quality improves, but one does not replace the other.

Can I have filler and a skin booster on the same day?

Sometimes, depending on the areas and your doctor’s judgement. Many clinicians prefer to space them out to monitor swelling.

Which is best for under-eyes?

It depends on the cause. Hollow under-eyes may suit careful filler, while crepey, thin skin may respond better to polynucleotides. A specialist assessment is important here.

Which has the least downtime?

Skin boosters usually have the shortest, with small bumps for a day or two. All three can cause bruising.

What age should I start?

There is no set age. The right moment is when a concern bothers you, whether that is volume, hydration or skin quality.

How do I avoid looking overdone?

Choose a practitioner who is willing to say no, starts conservatively, and reviews your results before adding more. See our price list if you want to plan a budget.