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PEXT™

PEXT · Premium Exosomes Therapy

Quality-defined regenerative biologics by Celleva

Quality begins before
the vesicle exists.

Most of this market measures the product. PEXT measures the cells that make it, on four numbers: glutathione level, population homogeneity, recovery capacity and stress resistance. Populations that miss the profile never go into production.

See how selection worksTwo platforms
GM
Mean level
GH
Heterogeneity
GRC
Regeneration
ORC
Stress resistance
FreSHtracer™ · source-cell assessmentAcquiring
FR (GSH level) →Before gateGSH-high fraction
GM

0.00

Mean level

GH

0.00

Heterogeneity

Gated

100%

Of population

Illustrative acquisition. Values are read from the plotted population.

A PEXT Regenerative Powder vial: lyophilized white powder in clear glass with a crimped cap, carrying the “defined by GSH level and cellular homogeneity” mark.

What it is

A lyophilized regenerative powder, made from cells that were measured first.

Form
Lyophilized powder, reconstituted at the point of use
Composition
The purified exosome fraction, standardized at 1,000,000 ppm
Culture
Phenol red-free, animal component-free
Manufacture
cGMP and cGLP, with Seoul National University

Five preparations

Conditioned Media

See the range

On the name

Why “Regenerative Powder”, and not simply “Exosome”?

Exosomes exist as hydrated vesicles, released by cells into biological fluid. PEXT is built on that biology, but what ships in the vial is not a fluid. It is a purified, freeze-dried solid, reconstituted by the clinician before use.
  1. Illustration: a producer cell releasing extracellular vesicles into the surrounding fluid.

    01 / In culture

    Hydrated

    Suspended in fluid

    Producer cells release vesicles into the culture medium. This is the biology the platform rests on, and it is where the word exosome belongs.

  2. Illustration: purification by column chromatography, the isolated vesicle fraction, and freeze-drying at −50 °C.What ships

    02 / In the vial

    Lyophilized

    Dry solid

    The vesicle fraction is purified and then freeze-dried. It leaves the process as a stable dry cake, which is how it is stored, shipped and held on the shelf.

  3. 03 / In the clinic

    Reconstituted

    Back in suspension

    Diluent is added and the material returns to suspension. Reconstitution is a controlled step, carried out to a written instruction.

“Exosome”
names the biological platform the product is built on.
“Regenerative Powder”
names the stabilized physical format that reaches the clinic.

The name is not there to soften the science. It states the physical state of the material and the controlled reconstitution it requires, and it holds up while regulation around extracellular-vesicle products keeps moving. Naming the format precisely is not a concession; it is the same discipline the rest of the process is held to.

The premise

Beyond particle counts.

For years this field has advertised a single metric: how many. It is an easy number to print and an easy number to inflate, and it has become the industry’s substitute for evidence.

A particle count is a specification, not a proof of quality. The harder question is what is in the preparation, where it came from, and whether it can be reproduced.

Four things a particle count cannot establish

Identity
A count says particles are present. It does not say what they are, or whether exosomal biogenesis was ever demonstrated.
Purity
Non-vesicular protein, residual DNA and process contaminants are counted by some instruments as particles too.
Potency
Biological activity has to be measured in an assay. No particle number predicts it.
Consistency
One impressive lot is not a platform. Batch-to-batch behaviour is a separate question entirely.

So PEXT moves quality control upstream: before conditioned media are collected, before vesicles are isolated, before the product is stabilized.

Level 01Source · selection technology

Four numbers decide whether a cell population is allowed to produce anything at all.

The four glutathione parameters are measured on every candidate population before it is cleared to produce. They read a population two ways: where it sits, and how tightly it holds together.

Powered by FreSHtracer™

Glutathione Mean Level

The central intracellular glutathione level of the cell population.

Formula

Mean or median of FreSHtracer Ratio (FR)

A high mean says the population carries antioxidant reserve. On its own it says nothing about consistency.

FR (GSH LEVEL)CELL #ABGM: A < B
High and homogeneous, versus low and heterogeneous.Fig. 02

What the numbers separate

Glutathione is the cell’s central redox buffer. A population that holds it at a high level, evenly, across every cell behaves differently under load than one that holds it in patches.

That difference does not show up in a particle count taken weeks later. It shows up here, in the source population.

The assessment runs on every candidate population. A lot that misses the profile is not corrected downstream. It is not used.

All four parameters are recorded for the population behind each lot and travel with it on the batch record.

Inside Platform 01

Level 02 / Culture

Clean, controlled manufacture, not “organic production”

Every unnecessary culture component is one more process variable. Phenol red-free and animal component-free are process controls, not marketing adjectives.

The full workflow
Seven stages, from a screened source-cell population to the finished vial.Fig. 02

Two platforms

Not every application needs the same product. Every application gets the same standard.

Celleva runs two complementary production platforms, selected by intended purpose, desired biological profile, manufacturing requirement and regulatory pathway. They are different scientific tools, not competitors.

Platform 01 · Cell-selected

PEXT Native Biologics

Preserve the biological complexity of selected producer cells.

Source-cell populations are chosen on defined glutathione and homogeneity parameters, then expanded under phenol red-free, animal component-free conditions to generate EV-rich conditioned media and purified extracellular-vesicle preparations.

Choose this path when

  • The coordinated, multi-molecular signalling of native cell biology is what the application needs
  • You want the full secretome, not a single defined molecule
  • Source-cell provenance and measured quality are part of the argument
Regenerative PowderPEXT CM
Explore

Platform 02 · Precision-defined

PEXT NEW Recombinant

Maximize molecular definition and batch-to-batch reproducibility.

A defined human fibronectin gene sequence is introduced into a controlled microbial expression system to produce sequence-defined recombinant human fibronectin, without human producer cells anywhere in the process.

Choose this path when

  • Molecular definition and reproducibility outrank biological complexity
  • Scale and manufacturing consistency are the constraint
  • A jurisdiction restricts human-tissue-derived material
Recombinant fibronectin
Explore
Both pathways end-to-end, with the shared quality commitments along the bottom.Fig. 06

The PEXT product suite

Five specialized formulations. One quality standard.

Each product delivers focused regenerative support under the same commitment to measurable quality and documented potency. What separates them is concentration, the tissue they are formulated for, and how they are prepared at the point of use.

Product comparison

  • PEXT 1000 mg

    Regenerative Powder

    Composition
    Lyophilized powder, exosomes from 1,000 mg CM
    Intended use
    Regenerative purposes for normal tissues
    Preparation
    Reconstitute with diluent before use
    Product page

  • PEXT 3000 mg

    Regenerative Powder

    Composition
    Lyophilized powder, exosomes from 3,000 mg CM
    Intended use
    Regenerative purposes for highly degenerative tissues
    Preparation
    Reconstitute with diluent before use
    Product page

  • Skin Booster

    Regenerative Powder

    Composition
    Lyophilized powder, exosomes from 1,500 mg CM, with 3 mL skin booster
    Intended use
    Regenerative and cosmetic purposes for skin
    Preparation
    Mix the powder with the included 3 mL skin booster
    Product page

  • Hair Booster

    Regenerative Powder

    Composition
    Lyophilized powder, exosomes from 1,500 mg CM, with 3 mL hair booster
    Intended use
    Regenerative and cosmetic purposes for hair
    Preparation
    Mix the powder with the included 3 mL hair booster
    Product page

  • PEXT Exo-CM

    Conditioned Media

    Composition
    3,000 mg conditioned media, as solution
    Intended use
    Regenerative purposes for advanced tissue-support applications
    Preparation
    Ready-to-use liquid solution
    Product page
The same comparison as a single sheet, for printing or sharing.Fig. 05

Five formulations, unified by one promise: measurable quality, documented potency and predictable performance.

Not sure which

Presentation and delivery route follow the clinical objective.

See protocols

Level 05 / Release

The most important page on this site is not written by marketing.

It is the Batch Passport: the lot-release record, published per batch and made available to professionals. Everything else here is an argument. This is the evidence.

Do not take our word for it. Read the biology of the batch.

The full specification

PEXT Batch Passport

Six layers

01
Starting materialGM · GH · GRC · ORC, plus the MSC identity panel
02
ProcessCulture composition, passage number, isolation route
03
CharacterizationParticle profile, marker panels, purity, residuals
04
SafetySterility, endotoxin, mycoplasma
05
FunctionProduct-specific potency assay
06
StabilityMoisture, reconstitution, before/after lyophilization

Common questions

The four questions professionals ask first

Because an INCI ingredient name and a description of the biology answer two different questions. INCI nomenclature is a labelling convention for cosmetic products; it is not a description of a platform.

Fibronectin is a functional protein associated with extracellular-vesicle biology. It is not a universal exosome marker, and it cannot on its own establish identity, purity, concentration or biological activity. Those require multi-parameter analytical evidence, reported per lot.

The labelling rationale

Four measurements of the source-cell population, taken before production. GM is the central intracellular glutathione level. GH is the variability within the population, as a robust coefficient of variation. GRC is the ability to restore glutathione after an oxidative challenge. ORC is the fraction of cells that hold high glutathione under stress.

GH is the one the industry usually skips. Two populations can share a mean while one is uniform and the other is a mixture.

See the four parameters

It depends which platform the product comes from, and this is exactly why there are two.

Platform 01 preparations are derived from human umbilical cord MSC source cells. The producer cells are removed during processing; residual DNA and protein are release-tested and reported on the batch record.

Platform 02 uses no human cells at any stage. A defined human gene sequence is expressed in a microbial host, so the material is human-cell-free by construction. Where a jurisdiction restricts human-tissue-derived material, this is the applicable route.

Compare the platforms

Yes. Those are the settings the preparation is designed around. Micro-channels and the immediate post-procedure window give access to the dermal compartment while the matrix response is being initiated.

Protocols describe integration into clinician-directed procedures within the product’s authorized topical cosmetic use. They are not treatment claims, and outcomes are not guaranteed.

Integration protocols

For professionals

Quality is not an adjective here. It is a sequence of measurable decisions.

Source-cell quality, production environment, product characterization, stabilization and batch transparency. Five levels of evidence, connected upstream to downstream.

Request the scientific dossierScience & characterization
  1. 01SourceMeasured before production begins
  2. 02CulturePhenol red-free, animal component-free
  3. 03ProductIdentity, purity, composition, activity
  4. 04StabilityDemonstrated after reconstitution
  5. 05ReleasePer-lot record, published