PN

Ask what separates PN from PDRN and the usual answer is that PN is the longer one, which is true but stops one step short. Polynucleotide and polydeoxyribonucleotide are the same salmon-derived DNA chemistry at different chain lengths, and the length is not a trivia detail. It is the thing that changes how the material behaves in the skin. This page sets out what PN is, how it differs from its shorter relative, and what a sourcing partner can verify about it.

What PN actually is

PN (polynucleotide) is a nucleic-acid polymer built from nucleotide units and purified from the DNA of salmonid fish, typically chum salmon or trout. It is neither a protein nor a vesicle, which is what separates it from growth factors and exosomes on the same regenerative shelf, and it is neither a hyaluronic acid filler nor a neuromodulator. It sits in the regenerative category, positioned around skin quality and hydration rather than added volume.

PN shares its family with PDRN. The two are the same salmon-derived DNA at different fragment lengths, and the 2025 reviews that standardize the terms draw the line by molecular weight: PN for the longer chains at or above about 1,500 kDa, PDRN for the shorter and medium chains below it. The longer PN chains are more intact and more viscous, and that physical difference is what shifts PN toward a structural role.

How it is described to work

Because PN chains are longer and more viscous, the cited literature associates them less with rapid receptor signaling and more with a structural role. In hyaluronic-acid and polynucleotide complexes, the longer chains are reported to raise elasticity, viscosity, and viscoelasticity, behaving as a hydrating, water-binding scaffold within the dermis while they slowly break down. That is a described mechanism, not a promised outcome, and this page describes it rather than claiming a result for any individual.

PN, PDRN, and the neighbors

Neither PN nor PDRN should be read as a ranked version of the other; they are two points on one continuum of chain length. The wider regenerative shelf holds two different kinds of object next to them: exosomes, which are cell-derived vesicles carrying mixed cargo, and growth factors, which are single defined proteins. For the PN versus PDRN distinction in depth, see PN vs PDRN and the molecular-weight reading; for how the regenerative actives sort apart, see the regeneration map. The neighboring ingredient hub covers PDRN directly.

Forms and professional use

In the K-derma catalog, PN boosters arrive mostly as pre-filled syringes and vials of solution, intended for professional use. Because they are biological preparations, cold-chain handling and traceable provenance are part of what defines the product rather than optional extras.

Regulatory reality

Regional status matters and should be stated plainly. In South Korea, polynucleotide skin boosters such as Rejuran are cleared under a regulated medical framework by the Ministry of Food and Drug Safety (MFDS). In the United States, no PN injectable is FDA-approved for aesthetic use; topical products can be sold as cosmetics only where no drug-like claims are made. Confirm current status with the relevant authority before acting, since these rules change over time.

How KSTATION verifies PN products

Because a DNA-polymer booster is only itself when it arrives intact and correctly stored, sourcing sits next to mechanism in any serious assessment. Manufacturer and licensing details are checked against MFDS records before a product is listed, and we stock officially sourced products only. The full method is set out in our Editorial & Sourcing Policy.

Common questions

Is PN the same as PDRN?

Not identical, but not opposites. Both are nucleotide polymers from the same salmon or trout DNA. The standardizing reviews separate them by chain length: PN for longer chains at or above about 1,500 kDa, PDRN for shorter chains below it. The longer PN chains are more viscous and associated more with a structural, water-binding role.

Is PN a filler?

No. PN is a nucleic-acid polymer in the regenerative category. It is neither a hyaluronic acid filler nor a neuromodulator, and it is positioned around skin quality and hydration rather than adding volume.

Is PN FDA-approved in the United States?

No PN injectable is FDA-approved for aesthetic use in the US. Injectable polynucleotide boosters such as Rejuran remain MFDS-cleared in Korea but are not authorized for aesthetic injection in the US.

Sources & references

1. From Polydeoxyribonucleotides (PDRNs) to Polynucleotides (PNs): Bridging the Gap (2025), size-based definitions and molecular-weight thresholds. pmc.ncbi.nlm.nih.gov
2. Polynucleotides in Aesthetic Medicine and HA-polynucleotide complex rheology (viscoelasticity, scaffolding). pmc.ncbi.nlm.nih.gov
3. U.S. FDA, Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?), structure/function vs. drug claims. fda.gov

This page is general educational information, not medical advice, and describes what PN is rather than what any product will do for an individual. Products referenced are for professional use. Regulatory status varies by country and changes over time.