Polynucleotides vs Hyaluronic Acid: What's the Difference — And Which One Does Your Skin Actually Need?
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Both are injected into skin. Both improve how skin looks and feels. Both get mentioned constantly in aesthetic clinics and skincare content.
And yet they work completely differently — and choosing the wrong one for your goals is a bit like hiring a plumber when your walls need repainting. Technically qualified. Just not what the job requires.
Here's the honest breakdown.
First, What Is Hyaluronic Acid?
Hyaluronic acid (HA) isn't new, and it isn't exotic. It's a naturally occurring molecule in the skin that binds up to 1,000 times its weight in water.
Your body already makes it. The issue is that production slows significantly with age — which is when skin starts to lose that plump, dewy quality that used to just happen on its own.
When used as an injectable skin booster, hyaluronic acid works by flooding the skin with hydration from within. It attracts and retains water, improving skin elasticity, restoring volume, and reducing the appearance of fine lines and wrinkles.
The results are relatively immediate. You can often see a difference within days — sometimes hours — of treatment.
Popular HA-based skin boosters include Profhilo, Restylane Vital, and Juvederm Volite.
And What Are Polynucleotides?
Polynucleotides (PN) — or more specifically, PDRN (polydeoxyribonucleotide) — are a different animal entirely. Literally.
Polynucleotides are fragments of DNA derived from salmon or trout. When used in aesthetic treatments, they aim to harness the regenerative power of DNA to stimulate collagen and elastin production, promoting skin rejuvenation.
Where hyaluronic acid hydrates, polynucleotides repair. Rather than filling the skin with water or volume, they trigger the skin's own biological processes — essentially telling your cells to get back to work producing the structural proteins that keep skin firm, resilient, and healthy.
While hyaluronic acid mainly hydrates skin, polynucleotides encourage the skin to produce more collagen and elastin, helping it repair itself naturally.
The most well-known polynucleotide treatment in Australia is Rejuran — TGA-approved since 2023.
The Core Difference: Fill vs. Repair
This is the simplest way to understand it:
Hyaluronic Acid = brings water in, adds volume, delivers immediate visible results Polynucleotides = triggers cellular repair, builds collagen, delivers gradual long-term improvement
Neither is better in absolute terms. They're solving different problems.
Think of it this way. If your skin is a house:
- Hyaluronic acid is fresh paint and new furniture — the place looks great immediately
- Polynucleotides are structural renovation — slower, but the foundation is genuinely stronger afterwards
What Results Can You Expect — And When?
| Hyaluronic Acid | Polynucleotides | |
|---|---|---|
| Results timeline | Days to 1 week | 2–6 weeks |
| Primary effect | Hydration, plumping | Collagen rebuilding, repair |
| Duration | 4–8 months | 6–12 months |
| Best for | Immediate glow, volume loss | Skin quality, texture, long-term repair |
| Sessions needed | 1–2 | 3 (spaced 4 weeks apart) |
Who Should Choose Hyaluronic Acid?
HA skin boosters are a strong choice if:
- You want results before a specific event
- Your primary concern is dehydration and dullness
- You've noticed volume loss in specific areas
- You want something with an established, long track record
Who Should Choose Polynucleotides?
Polynucleotides — particularly Rejuran — are the better choice if:
- Your skin has lost quality over time: texture feels rough, pores look enlarged, fine lines are appearing
- You have acne scarring or damage you'd like to address
- You have sensitive or reactive skin that doesn't respond well to more aggressive treatments
- You're interested in long-term skin health rather than a quick fix
- You've had results from HA that faded faster than expected
Can You Use Both?
Yes — and increasingly, people do. Polynucleotides improve skin structure from within, while hyaluronic acid provides immediately visible volume. The combination is individually tailored.
For someone who wants both immediate improvement and long-term structural change, combining treatments can be highly effective. Your practitioner can advise on timing and sequencing based on your specific skin.
What About Topical Hyaluronic Acid vs. Topical PDRN?
Worth clarifying: both HA and PDRN are available in topical skincare products as well as injectables.
Topical HA is well established and genuinely effective — it draws moisture into the upper layers of skin and helps keep it there.
Topical PDRN products — like PDRN creams and serums — are a newer but growing category. They work at the surface level rather than the dermis, so the effect is less intensive than injectable treatment. That said, used consistently, they offer real support for skin repair and hydration — particularly as a complement to in-clinic Rejuran treatments.
👉 Shop our PDRN home care range at Lumina
Frequently Asked Questions
Is Rejuran the same as hyaluronic acid? No. Rejuran contains polynucleotides (PDRN) derived from salmon DNA. Hyaluronic acid is a different molecule entirely, with a different mechanism of action. Both can be used as skin boosters, but they work in fundamentally different ways.
Which lasts longer — HA or polynucleotides? Hyaluronic acid usually lasts four to eight months depending on the area and metabolism. Polynucleotides work more slowly but have a long-term stabilising effect on skin quality.
Can sensitive skin tolerate both treatments? Generally yes, though individual responses vary. Polynucleotides are particularly well-tolerated by sensitive skin due to their high biocompatibility with human tissue. Always discuss your skin history with your practitioner before treatment.
Which is better for anti-ageing? It depends on what aspect of ageing you're addressing. For volume loss and immediate hydration, HA. For collagen rebuilding, texture improvement, and long-term skin quality, polynucleotides. Many people benefit from both at different points in their skin journey.
Do I need a consultation before choosing? Yes — and any reputable clinic will insist on one. The right treatment depends on your skin, your goals, and your timeline. What works brilliantly for one person may not be the priority for another.
The Bottom Line
Hyaluronic acid and polynucleotides are both genuinely useful — they just do different things.
If you want your skin to look better immediately, HA gets you there faster. If you want your skin to actually be better — stronger, more resilient, producing more of what it's supposed to produce — polynucleotides are doing the harder, more lasting work.
And if you want both? That's a conversation worth having with your practitioner.
👉 Book a consultation at Lumina Skin Lab, Hornsby 👉 Learn more about Rejuran treatments