Quick Answer: Rejuran and Sunekos are both regenerative skin boosters that work by stimulating your own collagen rather than adding volume, but they use different active ingredients. Rejuran is built on polynucleotides (PN) derived from salmon DNA, while Sunekos combines non-crosslinked hyaluronic acid with a patented blend of amino acids. Rejuran tends to be favoured for deeper repair (acne scars, damaged or sensitive skin), while Sunekos is often chosen for hydration-led rejuvenation in delicate areas like under the eyes.
If you’ve been comparing skin boosters and keep running into both these names, you’re not imagining the overlap, they solve a similar problem through genuinely different biology.
The Core Difference: What’s Actually in Each
Rejuran is built around polynucleotides (PN), purified DNA fragments extracted from salmon. Once injected, PN acts as a biological signal, prompting your skin’s own repair processes and collagen production, rather than adding anything structural.
Sunekos combines non-crosslinked hyaluronic acid with a patented blend of six amino acids. Because the HA isn’t cross-linked, it behaves very differently from a volumizing filler, it spreads softly through tissue and supports the skin’s structure (the extracellular matrix) rather than sitting in place to create shape. The amino acids supply raw material fibroblasts need to build new collagen and elastin.
Both are regenerative rather than volumizing. Neither will change your facial shape the way a dermal filler does.
Side-by-Side Comparison
| Rejuran | Sunekos | |
|---|---|---|
| Active ingredient | Polynucleotides (PN) from salmon DNA | Non-crosslinked hyaluronic acid + amino acids |
| Mechanism | Signals skin’s own repair and collagen response | Hydrates and supplies raw material for collagen/elastin |
| Best known for | Skin repair, acne scarring, barrier support | Hydration, delicate-area rejuvenation, fine lines |
| Delicate area formulation | Rejuran I (specifically for under-eyes) | Naturally low-viscosity, suits under-eyes without a separate product |
| Typical results duration | 6–12 months | 6–12 months |
| Course length | 3–4 sessions, ~4 weeks apart | Typically a course of several sessions |
Where Rejuran Tends to Win
Rejuran’s strength is genuine tissue repair. Because PN specifically supports cell regeneration and barrier function, it’s often the better choice for:
- Acne scarring, Rejuran S, a higher-viscosity variant, is formulated specifically for this
- Sensitive, reactive, or barrier-compromised skin, including skin recovering from aggressive laser treatment
- Overall skin resilience, not just surface hydration
Where Sunekos Tends to Win
Sunekos’ non-crosslinked HA and amino acid blend makes it particularly well suited to:
- Delicate, thin-skinned areas like under the eyes, where its naturally soft, low-viscosity texture avoids the unnatural firmness a thicker product might create
- Hydration-led rejuvenation for early fine lines and skin that’s starting to lose elasticity, rather than skin with an active repair need
- A more even, all-over glow, similar in spirit to how Profhilo is used, though through a different ingredient combination
Can They Be Combined or Used Sequentially?
Some practitioners do use both across different areas or at different stages of a skincare plan, since they aren’t mutually exclusive treatments. Someone with acne scarring and separate under-eye hollowing, for instance, might use Rejuran S for the scarring and a lighter, hydration-focused option for the eye area. Your doctor’s assessment of your specific concerns should guide this, rather than assuming more products means better results.
Frequently Asked Questions
Is Rejuran or Sunekos better for anti-aging? Neither is universally “better”, Rejuran leans toward deeper repair and resilience, while Sunekos leans toward hydration and delicate-area rejuvenation. The right choice depends on whether your skin’s main issue is damage/repair or hydration/early fine lines.
Which lasts longer, Rejuran or Sunekos? Both typically offer results in a similar 6-to-12-month range, with maintenance sessions recommended to sustain the effect, since neither is permanent.
Is one more painful than the other? Both are generally well tolerated, delivered via fine micro-injections with topical numbing available. Discomfort levels are broadly comparable between the two.
Can Sunekos treat acne scars like Rejuran S? Sunekos is primarily positioned for hydration and delicate-area rejuvenation rather than scar remodelling specifically. For acne scarring, Rejuran S has a more targeted formulation and track record for this exact concern.
Is Sunekos safe for the under-eye area? Yes, its non-crosslinked, low-viscosity hyaluronic acid is a reason it’s frequently chosen for this delicate zone, though Rejuran I is a comparably suited option formulated specifically for the same area.
Do I need a course of sessions for either treatment? Yes, for both. Neither Rejuran nor Sunekos is designed as a one-and-done treatment, since they work by gradually stimulating your own collagen rather than delivering an instant result.
Bottom Line
Rejuran and Sunekos both work with your skin’s own biology rather than against it, but they get there differently, PN-driven repair versus HA-and-amino-acid-driven hydration and structural support. If your main concern is scarring or barrier repair, Rejuran is generally the stronger fit; if it’s hydration and rejuvenation in delicate areas, Sunekos is worth considering. At CLEO Clinic, our LCP-certified doctors assess your specific skin concern before recommending either treatment, or a combination approach. See our full Rejuran treatment guide for more detail, or book a consultation to find out which fits you.
