Does the FDA Approve Rejuran? PDRN Explained
Rejuran is a salmon-DNA skin booster, not a filler — and its injectable form isn't FDA-approved in the US, even though topical PDRN products are sold here legally as cosmetics. Here's what the evidence actually says and how it works.
Planning a trip to Seoul?
If you've scrolled past TikTok's "salmon sperm facial" trend, or heard a friend rave about Rejuran after a trip to Seoul, you've probably landed on the same question: what's actually in this stuff, and is any of it approved for use where you live? It's a fair question, because the marketing around salmon-DNA skincare moves a lot faster than the regulatory paperwork behind it. In this article, we'll cover what Rejuran and PDRN really are, how the science says they work, what the clinical evidence actually shows, and where the FDA stands on both the injectable and the topical versions.
The short answer? Rejuran is a salmon-DNA skin booster — a biostimulator that nudges your own collagen production, not a filler that adds volume. The injectable version isn't FDA-approved in the US; it's authorized for sale in Korea under the Ministry of Food and Drug Safety (MFDS). A separate category, topical PDRN creams, can legally be sold in the US as cosmetics, and that's exactly where a lot of the online confusion starts.
This is general information from BeautyStone, a dermatology clinic in Seoul's Hapjeong neighborhood — not a substitute for a clinician who has actually examined your skin.
What Is Rejuran, Exactly?
Rejuran is a brand of injectable skin booster made from purified salmon DNA. The manufacturing process strips out the proteins that could trigger an immune reaction, leaving behind DNA fragments that are used to encourage your skin to repair and rebuild itself — not to physically fill in a wrinkle or fold.
Here's where the naming gets messy. You'll see "PDRN" and "PN" used almost interchangeably online, but they aren't quite the same molecule. Both come from salmon (or trout) DNA, but the chain length differs. One comparison of the two molecules describes PN as the longer chain that behaves like a water-holding structural gel, while PDRN is the shorter, more pharmacologically active fragment with a defined receptor mechanism. Rejuran's active ingredient is technically PN — "PDRN" has just become the catch-all label the market uses for the whole salmon-DNA family.
PN (polynucleotide) is the longer salmon-DNA chain that holds water and gives Rejuran's gel its structure.
PDRN (polydeoxyribonucleotide) is the shorter, more biologically active fragment — the one doing most of the heavy lifting on tissue repair.
What Rejuran is not is a dermal filler. A filler sits in a pocket under the skin and holds a shape. A skin booster like this is placed shallowly, spread across the dermis, and works by prompting your skin's own repair process — so the change builds gradually over a series of sessions instead of showing up the moment the needle comes out.
How Does It Actually Work?
"Salmon DNA heals your skin" is the headline, but the actual mechanism is more specific than that. A review of PDRN's biology explains that it works largely by activating the adenosine A2A receptor, which ramps up VEGF production, encourages new blood vessel formation, and switches on fibroblast activity tied to collagen and tissue repair.
In plainer terms: the fragments do two things at once. They hand your fibroblasts spare nucleotide building blocks to work with, and they flip a receptor switch that dials down inflammation while dialing up the signals that build new collagen.
Adenosine A2A receptor is a cell-surface switch that, once activated, calms inflammation and encourages new blood vessels and collagen production.
That's also why one session rarely tells you much. Your skin is being asked to remodel itself from the inside, and that process takes weeks — not the fifteen minutes you spend in the treatment chair.
What Does the Research Actually Show?
This is the part worth reading slowly, because the marketing tends to run ahead of the data. A systematic review of polynucleotide treatments in aesthetic medicine pooled nine studies of low-to-moderate quality across 219 patients and found reduced wrinkles, better skin texture, and improved elasticity, with several results reaching statistical significance, alongside mild and temporary side effects and moderate-to-high patient satisfaction.
That same review is candid that most of the underlying studies came out of Korea, and that larger, higher-quality trials are still needed before anyone can draw firm conclusions. So the honest framing here is early evidence, trending positive — not a settled matter. Results vary with skin thickness, age, and how consistent you are with the full course, so a single dramatic before-and-after should be read as one person's outcome, not a rule.
What to Expect: Timeline and Recovery
Here's roughly how a course of Rejuran plays out, from the first visit to the point where you'd actually notice a difference.
- Day of treatment: A numbing step comes first, then a series of shallow microinjections across the treatment area. Most people walk out the same day with minor bumps and some redness.
- The first few days: Swelling, redness, small injection bumps, and the occasional bruise settle down over roughly two to four days.
- The following weeks: This is where the gradual part kicks in — texture and tone changes build slowly as your skin remodels itself, rather than showing up all at once.
- The full course: Most protocols call for a short series of sessions spaced a few weeks apart, with the effect stacking across the course rather than landing in one visit.
Individual results and recovery time vary with skin thickness, age, and technique, so treat any single before-and-after photo as one person's experience rather than a preview of what you'll see.
Side Effects and Risks
Reported side effects are mostly what you'd expect from any microinjection procedure:
- Redness and swelling: Common right after treatment, and it typically settles within a few days.
- Small injection bumps: These usually flatten out on their own within a day or two.
- Bruising: Occasional, and it can linger a bit longer than the redness does.
- Rare but possible: Infection or an allergic-type reaction, though this isn't common with a properly screened product.
If you notice spreading redness, fever, or worsening pain instead of gradual improvement, contact your provider or seek medical care right away rather than waiting it out. And if you're pregnant, breastfeeding, or managing a chronic skin condition, that's a conversation to have with your own clinician before you book anything.
Is Rejuran FDA-Approved in the US?
No — not as an injectable. This is the part where the online chatter gets genuinely misleading, so it's worth being precise.
In the US, cosmetics don't go through FDA premarket approval, which is why a topical PDRN cream or serum can legally be sold as a cosmetic for external use. That legality says nothing about the injectable version. An injectable placed into the dermis to change your skin's structure isn't a cosmetic in the regulatory sense — in the US, it would need FDA clearance or approval as a device or biologic, and injectable Rejuran/PN skin boosters currently don't have that.
So the accurate statement is this: injectable Rejuran is not FDA-approved in the US. It's authorized for sale in Korea under the MFDS — a different regulatory system with its own review process, not a looser version of the FDA's.
| Product | Category | US regulatory status |
|---|---|---|
| Injectable Rejuran (PN) | Prescription-only biostimulator, injected into the dermis | Not FDA-approved; sold in Korea under the MFDS |
| Topical PDRN cream or serum | Over-the-counter cosmetic | Sold legally — cosmetics don't need FDA premarket approval |
| HA microdroplet skin booster | Different molecule, same "skin booster" category | One version is FDA-approved — proof the category isn't banned outright |
Two footnotes for the careful reader. First, a topical cosmetic's legal status can't be stretched into a claim about the injectable — different route, different rules, different evidence bar. Second, the FDA has cleared a hyaluronic-acid microdroplet skin booster (a different product entirely, not a PDRN one), which shows the broader category isn't shut out — it just means this particular molecule hasn't cleared that bar in the US yet.
How Much Does a Session Cost — and Is It Worth It?
In Seoul, clinic price menus commonly list a single Rejuran session somewhere in the ₩200,000–₩500,000 range — very roughly $150–$370, depending on the amount used, the area treated, and the exchange rate on the day you book. Menus vary a fair amount between clinics, and packages change the math further, so treat any number you see online as a ballpark rather than a quote, and confirm directly before you commit.
Whether it's worth it really depends on what you're after. It tends to be a reasonable fit if you want gradual improvements in texture and skin quality, you're able to commit to a short series of sessions rather than a single visit, and you're comfortable with the fact that this is a booster, not a filler — it won't add volume or smooth out deep folds.
On the other hand, you'd probably want to look elsewhere if you're after one dramatic result from a single appointment, can't come back for repeat sessions, or are pregnant or breastfeeding (again, clear that with your own clinician first). The realistic payoff here is a subtle, cumulative improvement over a course of visits — not an overnight transformation.
The Bottom Line
Rejuran is a salmon-DNA biostimulator, not a filler — it works with your fibroblasts to gradually rebuild collagen rather than adding volume on the spot. The evidence so far is promising but still thin: a handful of small studies show improved texture and elasticity, with mild, temporary side effects, though larger and higher-quality trials are still needed. As for the FDA question, the honest answer is that injectable Rejuran isn't approved in the US, even though topical PDRN cosmetics are sold here legally under a much lower regulatory bar.
Like any injectable procedure, it comes with trade-offs — cost, a multi-visit commitment, and results that build slowly rather than all at once. Ultimately, the choice depends on your skin, your goals, and your budget.
If you're considering Rejuran, a consultation is the best way to find out whether it fits your skin and your timeline. BeautyStone is a dermatology clinic in Seoul's Hapjeong area — see current offers at /en/promotion.
Frequently Asked Questions
Q1. Is Rejuran the same thing as a dermal filler?
No. A filler sits in a pocket and holds a shape; Rejuran is a biostimulator that's spread shallowly across the dermis to encourage your own collagen production. It won't add volume or plump out a fold the way a filler does — the changes are gradual rather than immediate.
Q2. Is Rejuran approved by the FDA?
Not as an injectable. Injectable Rejuran and other PN/PDRN skin boosters aren't FDA-approved in the US. Topical PDRN creams can be sold here because cosmetics don't need FDA premarket approval — that's a much lower bar and doesn't say anything about the injectable version. In Korea, Rejuran is authorized for sale under the MFDS, a separate regulatory system.
Q3. How many sessions will I need, and how long do results last?
Most protocols call for a short course of sessions spaced a few weeks apart, since the effect builds gradually instead of appearing after one visit. How long it lasts varies from person to person — nobody can promise you a fixed number of months. A provider who's actually examined your skin can give you a realistic range for your case.
Q4. Does it hurt, and what's the downtime like?
Most clinics numb the area first, so the discomfort is usually described as mild stinging during the microinjections themselves. Afterward, expect temporary redness, small bumps, and occasional bruising that typically settle within a few days. If you notice spreading redness, fever, or worsening pain, contact a provider or seek care right away instead of waiting it out.
