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We’re seeing more and more questions like, “What’s the difference between Re2O and Rejuran?” and “Which one should I choose?” in our cosmetic surgery outpatient clinic.

 

In recent years, cosmetic medicine has evolved beyond simply “filling in wrinkles” and “adding volume” to focus on “Skin Quality Improvement”—a process of optimizing the skin’s overall condition.

 

In the field of cosmetic surgery, demand for skin boosters that improve skin quality is on the rise. In addition to Rejuran, which has a long track record, Re2O—which focuses on the extracellular matrix (ECM)—is gaining attention as a new option.

 

In this article, from the perspective of a cosmetic surgeon, we will systematically explain everything from the ingredients, mechanisms of action, indications, pain levels, and downtime to strategies for combining these treatments, providing readers with information to help them make an informed decision before their visit.

What Is Re2O (Rituo)? | A New-Generation Skin Booster Focused on ECM

Re2O (generally written as re2o) is an ECM skin booster based on human acellular dermal matrix (hADM).

 

Its most distinctive feature lies in a design philosophy that focuses not on the “cells themselves” but on optimizing the “foundation that enables cells to function effectively”—the ECM. The ECM is composed of collagen, elastin, proteoglycans, glycoproteins, and other components, and serves as the “scaffold” that determines the density, firmness, and elasticity of the dermis.

 

When the ECM deteriorates due to aging, UV exposure, inflammation, and other factors, the function of fibroblasts declines, leading to a loss of firmness, the appearance of fine lines, enlarged pores, and sagging skin.

 

Re2O targets this environment itself, aiming to enhance the skin’s underlying vitality. In cosmetic surgery, it is increasingly recognized as a suitable option for those seeking natural rejuvenation and simultaneous improvement in pore appearance and skin firmness.

Main Components and Mechanism of Re2O

• hADM (Human-Derived Decellularized Dermal Matrix): Removes cellular components while utilizing the ECM structure with safety in mind

• ECM protein group: collagen, elastin-related components, proteoglycans

• Three-dimensional scaffold structure: Contributes to maintaining fibroblast function and promotes the restoration of firmness and elasticity

The core of Re2O lies not in directly “stimulating” cells, but in creating an “environment” that allows them to function properly. This theory is easy to explain to clients who prioritize building a solid foundation during cosmetic surgery consultations.

What Is Rejuran? | Supporting the Body's Repair Capacity with PN (Polynucleotides)

Rejuran is a skin booster whose main ingredient is polynucleotide (PN) derived from salmon DNA, and it has been used to support cellular repair and regeneration.

 

It has gained popularity worldwide, particularly in South Korea, and a wealth of clinical experience has been accumulated. The product lineup includes Rejuran Healer, Rejuran i, Rejuran HB, and Rejuran S, allowing you to choose the product that best suits your specific treatment area and concerns.

 

In cosmetic surgery, it is used to restore skin texture after damage and to improve fine lines, skin texture, and dryness.

Rijuran's Main Ingredients and Mechanism of Action

• Polynucleotide (PN): Supports the cellular repair environment using DNA fragments derived from salmon DNA

• Supports Regeneration: Helps activate the hair’s self-repairing ability and contributes to restoring texture and shine

The treatment focuses on “repair and regeneration.” In cosmetic surgery practice, it is often chosen to address post-inflammatory unevenness, fine lines, and uneven skin texture.

The Biggest Difference | Understanding "Where to Focus" (The Approach of Cosmetic Surgery)

• Rejuran: An Approach That Supports Cell Repair and Regeneration (A Cell-Based Approach)

• Re2O: An Approach to Optimizing the ECM Environment—the Foundation for Cell Function (An Environmental Approach)

In the field of regenerative medicine and tissue engineering as well, both cells and the ECM are considered equally important. In cosmetic surgery, the decision is made by determining whether to “prioritize repair” or “prioritize building a foundation”—not based on a simple comparison of which is better, but by working backward from the condition of the skin.

Ingredient Comparison (Key Points)

• Re2O: hADM, ECM proteins (collagen, elastin-related components, proteoglycans)

• Rejuran: Polynucleotide (derived from salmon DNA)

Differences in the Changes We Can Expect

Expected Changes in Re2O

• Improved firmness and elasticity, enhanced skin density

• Improving Pores Caused by Enlarged Pores and Loss of Firmness

• Helps reduce fine lines, even out skin texture, and reduce redness

• “Natural Rejuvenation Through ”Building a Strong Skin Foundation”

Changes Expected from Rejuran

• Supports the skin's natural repair process; restores texture and radiance

• Improving Fine Lines and Dryness

• Improving the Texture of Acne Scars and Other Scars

• Restoring Skin After Inflammation

Differences in Pain and Pain Management in Cosmetic Surgery

Rijuran is said to cause relatively severe pain due to the characteristic stinging sensation felt during injection, so pain management measures such as anesthetic cream, nitrous oxide, or nerve block anesthesia may be used in conjunction with the treatment.

 

Due to the formulation characteristics of Re2O, some people may find it relatively mild, but pain perception varies from person to person. In cosmetic surgery, we optimize the treatment area, injection depth, and technique, and combine these with cooling and anesthesia to minimize discomfort.

Differences in Downtime and Countermeasures in Cosmetic Surgery

Since both treatments involve injections, redness, swelling, hives, and bruising may occur. Rejuran is often administered in small doses into the skin, so slight swelling (lumps) may persist for a few days.

 

While Re2O may cause swelling depending on the injection site and technique, downtime can be managed through careful selection of injection sites and distribution planning. In cosmetic surgery, we ensure thorough planning to fit your schedule and provide comprehensive guidance on aftercare (cooling, moisturizing, and UV protection).

How to Choose Based on Your Concerns (Indications for Cosmetic Surgery and Triage)

When You Want to Improve Your Pores

For enlarged pores and pores caused by loss of firmness, Re2O—which can boost ECM density—is an excellent choice. On the other hand, for skin with noticeable acne scars, scars, or post-inflammatory hyperpigmentation, Rejuran—which excels at supporting skin repair—is a strong contender.

 

At our cosmetic surgery clinic, we diagnose the type of pores (such as sagging pores, pores dominated by blackheads, and scarred pores) and design a treatment plan that integrates in-clinic procedures with at-home care.

Approaches to Different Types of Fine Lines

• Main Causes: Dryness and Loss of Density—Use Re2O to Prepare the Skin, Combined with Moisturizing and Barrier Care

• Caused by photoaging and sun damage: Rejuvelan helps promote repair and strengthens daytime protection against UV and HEV rays

Even though they are all referred to as “fine lines,” the causes are complex. In cosmetic surgery, these lines are categorized based on factors such as static, dynamic, epidermal, and dermal characteristics, and treatments such as botulinum toxin, lasers, and RF microneedling are combined as needed.

Thin areas such as the neck and the backs of the hands

The neck and the backs of the hands are areas where dermal density tends to decrease, making them places where signs of aging become particularly noticeable.

 

Both Re2O and Rejuran are being evaluated for their indications, and in cosmetic surgery, the injection depth, volume, and treatment area are optimized for each specific site—such as horizontal neck wrinkles, skin texture improvement, and loss of firmness on the back of the hands.

Term and Renewal Plans

Although results vary from person to person, it is generally recommended to schedule multiple sessions at 2- to 4-week intervals initially, followed by maintenance sessions every six months to a year.

 

The duration of results varies depending on age, lifestyle, UV exposure, and consistency in skincare. At our cosmetic surgery clinic, we create a roadmap that takes into account the season, upcoming events, and any scheduled photo shoots.

Approaches to Combination Therapy and Protocols (Practical Knowledge in Cosmetic Surgery)

Using them together makes perfect sense. A typical approach is a two-step strategy: “Prepare the ECM environment with Re2O and support repair with Rejuran.” This comprehensively enhances skin texture, firmness, and radiance.

 

In addition, there is a strategy that involves gradually combining skin boosters—such as Volite, Profilo, Jubelook, and GOURI—with energy devices, depending on the treatment goals.

 

In cosmetic surgery, the key is “interval planning,” which aims to achieve synergistic effects while avoiding excessive stimulation.

Ratings and Followers | How to Interpret "Before & After"

• Standardizing Shooting Conditions: Ensuring Consistency in Lighting, Angles, and Facial Muscle Tension

• Multi-point Evaluation: Firmness, Pores, Redness, Radiance (Luster), Fine Lines, Makeup Application

• Time-Series Comparison: Verified Through “Before & After” Data at the Initial Consultation, Upon Completion of the Initial Course, and During the Maintenance Phase

In cosmetic surgery, we recommend using a combination of quantitative measurements (skin analysis devices) and before-and-after comparisons to ensure evaluations are not overly subjective.

Safety, Risks, and Contraindications (Be Sure to Confirm These at a Cosmetic Surgery Clinic)

• Common Possible Effects: Redness, swelling, hives, bruising, temporary discomfort

• Rare events: Infection, hypersensitivity reactions, hyperpigmentation (constitutional or post-inflammatory)

• Contraindications and Precautions: Consult a healthcare professional if you are pregnant or breastfeeding; have active inflammation or an infected area; are in the active phase of an autoimmune disease; have a tendency toward severe scarring; or are taking anticoagulant medication.

In all cases, a medical consultation is required. During a consultation at a cosmetic surgery clinic, we will ask detailed questions about your medical history, current medications, allergy history, and daily schedule to help strike a balance between downtime and your desired timeline.

Frequently Asked Questions (Q&A for the Cosmetic Surgery Outpatient Clinic)

Q. Which one makes you feel more “rejuvenated”?

A. It depends on the desired outcome. The basic approach is to use Re2O to improve firmness and density, and Rejuran to boost damage repair. In cosmetic surgery, we identify the various contributing factors and combine treatments as needed.

Q. I'm worried about the pain.

A. Rejuran tends to cause slightly more discomfort, while Re2O is considered relatively mild. In cosmetic surgery, anesthetics and cooling are used, and discomfort is minimized through careful planning of the injection layers, lines, and points.

Q. I can't take time off from work.

A. Effective scheduling practices at cosmetic surgery clinics include adjusting procedures and treatment levels to minimize the appearance of noticeable welts, as well as scheduling appointments before the weekend. Be sure to confirm in advance how to prevent bruising and when you can start wearing makeup.

Q. How many sessions does it take to notice a difference?

A. Results vary from person to person, but treatment typically involves several sessions at the beginning, spaced 2 to 4 weeks apart, followed by maintenance sessions. Cosmetic surgery clinics keep a record of “Before & After” photos from each session to visualize the progress made.

Q. Is one of them enough?

A. It depends on your skin condition. While some people may find that a single treatment is sufficient, others may benefit more from a phased combination of Re2O and Rejuran to achieve a synergistic effect. We will determine the best course of action during your consultation at our cosmetic surgery clinic.

“Determining Whether to Focus on ”Repair or Foundation-Building” at a Cosmetic Surgery Clinic

Both Re2O and Rejuran are skin boosters designed to promote skin health, but they target different areas.

 

Rejuran supports repair and regeneration through PN, while Re2O is based on hADM and works to optimize the ECM environment, addressing the skin from the foundation up. Rather than simply comparing which is better, it makes sense to choose between them based on your desired results and your skin’s current condition. If you prioritize minimizing pores, improving firmness, and enhancing skin density, Re2O is the better choice; if your focus is on post-inflammatory recovery and improving fine lines and skin texture, Rejuran is the better option.

 

Furthermore, cosmetic surgery clinics provide comprehensive treatment plans that incorporate a phased combination of both procedures to leverage their respective strengths, as well as the design of injection layers, lines, and surfaces; strategies to minimize pain and downtime; and chronological “Before & After” evaluations. To achieve beautiful results as efficiently as possible, don’t base your decision solely on the product name—instead, undergo a thorough examination and consultation at a cosmetic surgery clinic to select a plan tailored to your skin type, lifestyle, and goals.

 

Understanding the fundamental differences between Re2O and Rejuran and making a smart choice is the first step toward achieving natural, radiant skin.

Summary

Re2O (Rituo) and Rejuran are skin boosters that aim to improve skin texture through different mechanisms.

 

Re2O is a formulation that excels at “laying the foundation” by optimizing the ECM environment to improve firmness, elasticity, and skin density. On the other hand, Rejuran is suitable for improving fine lines, skin texture, and damaged skin by supporting repair and regeneration through PN.

 

Which option you should choose depends not only on your age but also on your skin type, lifestyle, and the specific concerns you wish to address. The quickest path to beautiful skin is to start by getting an accurate skin assessment at a cosmetic surgery clinic and developing a treatment plan tailored to your needs.

 

▷ Rituo Re2O (Bunaju) Treatment Page

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