Re2O, Rejuran and other skin boosters: how do they differ?
Skin boosters differ mainly in what is injected and how it is meant to work. Hyaluronic acid boosters hold water in the skin; polynucleotide boosters such as Rejuran use DNA fragments, usually from salmon, that are thought to support the skin's repair; collagen-stimulating boosters use synthetic particles that prompt the body to build collagen; and Re2O supplies human acellular dermal matrix, the skin's own structural framework. None of them lifts sagging tissue, and the right one depends on what is wrong with your skin.
Direct head-to-head studies between these products are limited, so the choice is a clinical judgement rather than a ranking.
What a skin booster is, and is not
"Skin booster" is a broad marketing term, not a medical category. It usually means an injectable placed in small amounts across the skin, in the dermis or just beneath it, to improve hydration, texture, fine lines or thickness rather than to add shape. That separates boosters from volumizing fillers, which are placed deeper to restore contour, and from lifting devices such as Ulthera, which act on the supporting layer under the skin.
Because the word covers very different materials, two "boosters" can have little in common beyond the needle.
The main types at a glance
| Type | Example | What is injected | Main idea |
|---|---|---|---|
| Hyaluronic acid | Various; Skinvive is FDA-approved in the US for cheek skin smoothness | Non-crosslinked or lightly crosslinked hyaluronic acid | Draws and holds water; hydration and glow |
| Polynucleotide (PN) and PDRN | Rejuran (PharmaResearch, Korea) | DNA fragments, usually from salmon | Thought to support the skin's repair environment |
| Collagen stimulator, diluted | PDLLA products such as Juvelook; diluted PLLA (Sculptra) | Synthetic biodegradable particles | A controlled response around the particles builds collagen |
| Human dermal matrix | Elravie Re2O (L&C Bio, Korea) | Particulated human acellular dermal matrix (hADM) | Supplies matrix components directly |
Other injectables are also marketed as boosters, including exosome and blood-derived products. Evidence and regulation for these vary widely, so ask specifically what a product is and what it is approved for.
Hyaluronic acid boosters
Hyaluronic acid is a sugar molecule found naturally in skin that binds water. Injected in a thin, mostly non-crosslinked form, it can make dry or dull skin look more hydrated and smoother. The effect is fairly quick to appear and wears off over months as the body breaks the hyaluronic acid down. These boosters mainly improve hydration; they do little for firmness.
Polynucleotide boosters such as Rejuran
Polynucleotides are chains of DNA building blocks, purified from salmon in most products. Rejuran, made by the Korean company PharmaResearch, is a widely used example, and several versions exist for different areas. The proposed mechanism is support for the skin's repair and a calmer, healthier environment for skin cells, which may improve texture and fine lines over a course of sessions. Small raised bumps at the injection points are typical for a day or so, and the injections can be uncomfortable. Tell the clinic about any fish allergy.
Collagen-stimulating boosters
Collagen stimulators such as PDLLA products, or Sculptra (PLLA) diluted and spread widely, use particles that the body gradually breaks down while building collagen around them. Results appear slowly over weeks to months. Dr. Kim writes that the dilution is chosen by the goal: more concentrated for volume, more diluted and spread wider for skin quality. They carry a risk of nodules if placed too superficially or unevenly. In a column on injection safety, he notes that serious vascular complications, though rare, have been reported in the literature for collagen-stimulating injections, and that correct layer and technique matter (column on injection safety, 2025). How these products compare is covered in Sculptra, Radiesse and other collagen stimulators: how do they differ?
Re2O
Re2O is made from donated human skin processed to remove its cells, leaving the collagen- and elastin-rich matrix, which is then finely particulated. In his column, Dr. Kim describes it as a different kind of booster: rather than adding a single ingredient, it supplies the same structural material that makes up the skin's own support (column on Elravie Re2O, 2026). In Korea it is supplied under the regulations for human tissue products; it is not approved by the US FDA, and long-term data are limited. More detail is in What is Re2O (Elravie Re2O), and who is it for?
Matching the booster to the problem
| Main concern | Types often considered |
|---|---|
| Dryness, dullness, lack of glow | Hyaluronic acid boosters |
| Fine lines, rough texture, sensitive or thin skin | Polynucleotide boosters, Re2O |
| Thin, crepey skin with mild loss of firmness | Re2O, diluted collagen stimulators, often with radiofrequency |
| Mild hollowing in a broad area | Collagen stimulators; Re2O in some cases |
| Sagging jowls, low brow | Not a booster problem: lifting device or surgery |
This is a starting point, not a prescription. In a column on lines around the mouth, Dr. Kim separates products suited to fine lines from those suited to deeper volume correction, and stresses the overall balance of the face rather than single areas (column, 2025). Of Re2O, he writes that it is chosen only when it is the most suitable booster for that skin.
Boosters together with energy devices
Boosters and lifting devices work on different problems, so they are often planned together. A device such as Thermage firms the skin through heat, and Ulthera works on the deeper support layer; a booster works on the quality of the skin itself. Dr. Kim notes in his column that Re2O can be used alone but is often paired with focused ultrasound or radiofrequency, so that lifting and repair of the dermis happen together. When a device and injections are done on the same day, the device treatment is commonly done first; see Can Thermage and Re2O be done on the same day?
Questions to ask about any booster
- What exactly is in it, and where does the material come from?
- What is it approved for, in Korea and in my own country?
- Which of my concerns is it meant to improve, and which will it not change?
- How many sessions, how far apart, and when should I expect to judge the result?
- What are the common effects afterwards, and what would be a reason to call the clinic?
What all boosters share
- Gradual, modest change in texture and quality, varying between people
- A course of several sessions is common, spaced weeks apart
- Short downtime: bumps, redness and possible bruising for a day or a few days
- Common risks: bruising, swelling, lumps, infection (rare) and allergic reactions
- No lifting: they do not reposition tissue that has descended
Boosters are usually avoided during pregnancy or breastfeeding and with active skin infection. Tell the clinic about allergies, immune conditions and blood thinners.
When a booster is the wrong tool
If the main change is in a deeper layer, a booster will disappoint however well it is chosen. Loosened support needs a lifting treatment such as Ulthera; marked descent, heavy jowls or excess skin need surgery such as a mini facelift or facelift. Dr. Kim trained in facial surgery and will say when that is the case, although he does not perform surgery at Violacell.
Why it matters who plans it
Boosters are often sold by brand name, but the decision that matters is which layer needs help. Dr. Kim writes that lifting treatment should begin by looking at every layer to find the cause (clinic blog, 2025). He has written about how collagen stimulators differ and about Re2O in his own columns, and in 2026 he lectured to about 100 clinicians on stepwise combination treatment for skin quality. Why Dr. Kim for the skin layer · Why Dr. Kim for collagen stimulators
Common questions
Is Re2O better than Rejuran?
Not in general. They work differently: Rejuran uses polynucleotides, usually from salmon DNA, while Re2O supplies human acellular dermal matrix. Head-to-head evidence is limited, and the choice depends on your skin's main problem and your preferences.
Can skin boosters lift sagging skin?
No. Boosters aim at skin quality such as hydration, texture and fine lines. Sagging comes from deeper layers and needs a lifting treatment, or surgery when it is marked.
How many booster sessions are usually needed?
It depends on the product and the skin. A course of several sessions spaced a few weeks apart is common. For Re2O, Dr. Kim writes that around three sessions three to four weeks apart give a fuller effect.
Can different boosters be combined?
Sometimes, when the skin has more than one problem, such as dryness and thinning. Combinations add cost and injection effects, so they are planned around a clear reason rather than used by default.
Related pages: Re2O · Thermage + Re2O · Sculptra · Sculptra or hyaluronic acid filler? · Fine lines or sagging: which layer?