Rejuran in Japan: The Salmon DNA Treatment You Can't Get Back Home

Last updated: March 2026 · By ClinicJapan Research

Rejuran is one of those treatments that sounds like marketing nonsense until you actually understand what it does. "Salmon DNA skin healer" — I get it, it sounds ridiculous. But the science is real, the results are measurable, and there's a reason it's become one of the most popular skin treatments in Japan and Korea while remaining essentially unavailable in the West.

If you live in the US, UK, or Europe and you want Rejuran, you need to get on a plane. Japan is one of the best places to do it — comparable quality to Korea, excellent dermatologists, and prices that are competitive for the product quality. Here's what you need to know.

What Rejuran Actually Is (No Marketing BS)

Rejuran is an injectable made from polynucleotide (PN) — a molecule extracted from salmon DNA. Before you cringe: the product doesn't contain fish proteins, fishy smells, or anything that would trigger a seafood allergy in most people. The polynucleotide is a highly purified, biocompatible molecule that your skin cells recognize and respond to.

What it does is genuinely interesting: PN acts as a "biological scaffold" that stimulates your fibroblasts (skin-building cells) to produce more collagen, improve skin elasticity, and repair damaged tissue. Unlike dermal fillers that add volume from outside, Rejuran triggers your skin to regenerate from within. The result: thicker, more elastic skin with improved texture and tone — but developed gradually over 2–6 weeks, not instantly.

March 2026 Pricing: All Three Rejuran Types

Who Should (and Shouldn't) Get Rejuran

What a Rejuran Session Is Actually Like

Here's the honest play-by-play, because "micro-injections" sounds vague:

Before (20 min): Numbing cream is applied to your entire face. It takes about 20 minutes to take effect. Some clinics use a stronger anesthetic for the under-eye area. You lie down in a treatment room that looks like a very clean, very minimalist doctor's office.

During (15–20 min): The doctor uses a very fine needle to inject small amounts of Rejuran across your face in a grid pattern — typically 50–100+ tiny injections. Each one is a quick prick. With numbing cream, it's uncomfortable but not painful. The under-eye area (Rejuran i) is the most sensitive part. The whole thing takes 15–20 minutes.

Immediately after: Your face will have small bumps at each injection point — like tiny mosquito bites in a grid pattern. This looks alarming but is completely normal. The bumps flatten within 24–48 hours. Mild redness resolves within a few hours. You can go about your day, but you'll probably want to skip any dinner plans for the evening.

Days 1–3: Bumps resolve. Skin may feel slightly dry or tight. Apply moisturizer and SPF as directed. No makeup for 12 hours post-treatment.

Weeks 2–4: This is when results start appearing. Skin looks more hydrated, firmer, and "healthier" — it's subtle but noticeable. The improvement continues over 4–6 weeks as collagen production increases.

Rejuran vs Profhilo vs Juvelook: Which Skin Booster?

This is the question every Tokyo dermatologist gets asked. All three are "skin boosters" but they work differently:

My honest take: Rejuran is the best choice for overall skin quality improvement and repair. Profhilo is better if dehydration and mild sagging are your main concerns. Juvelook is newer and targets collagen loss more aggressively. Many Tokyo patients combine Rejuran Healer with pico laser toning — the Rejuran repairs while the pico addresses pigmentation. It's a powerful combination that addresses multiple skin concerns simultaneously.

For Short-Term Visitors: Is 1–2 Sessions Worth It?

The full Rejuran protocol is 3–4 sessions. But most visitors to Japan can only manage 1–2. Is it still worth it?

Honestly — yes, with caveats. One session provides measurable benefit: improved hydration, some texture improvement, and a "skin health boost" that lasts 2–3 months. You won't get the full cumulative result of 3–4 sessions, but you'll still walk away with better skin than you arrived with.

If you can manage 2 sessions during a 2-week trip (sessions on day 2 and day 14), that's even better — you get roughly 60–70% of the full protocol benefit. For those planning longer stays for rhinoplasty or eyelid surgery, you can easily fit 2–3 Rejuran sessions into a 2-week recovery period.

If you're visiting for a weekend beauty trip, Rejuran works fine as a single session — the bumps resolve in 24–48 hours, so you'll look normal for your Sunday flight home. For those doing a Japan + Korea combo trip, consider getting Rejuran in Korea (slightly cheaper, same product) and using your Japan leg for laser treatments instead. Check our Korea vs Japan guide for the full comparison, and browse our English skin clinics directory if language is a concern. Our acne treatment guide also covers Rejuran S for acne scar patients, and our under-eye filler guide compares Rejuran i with filler alternatives.

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