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Wharton's Jelly Stem Cells for Clinics | The Science | ATOM Stem Cells
The Science · Wharton's Jelly Stem Cells for Licensed Providers

What's actually in the vial — and why it matters.

Two Wharton's Jelly stem cell vials can look identical on paper. The biology inside them is rarely the same. This is the plain-language breakdown of every component in an ATOM mesenchymal stem cell product, the patented method we use to preserve them, and the questions every clinic should ask before signing another supplier.

ATOM Stem Cells supplies premium Wharton's Jelly mesenchymal stem cells (WJ-MSCs) and characterized exosomes to licensed clinics, med spas, IV therapy practices, chiropractors, functional medicine doctors, and orthopedic providers across the United States. Every product is sourced from FDA-registered tissue facilities, processed under AATB and AABB guidelines, and verified per-lot by independent laboratories including Eurofins DPT and the Ohio University Innovation Center.

What separates a clinically potent stem cell product from an expensive saline injection is not what's printed on the label — it's the lab method behind it. Population doubling level (PDL), 3D bioreactor culture, animal-product-free media, DMSO cryopreservation, and proper exosome characterization determine whether the cells you inject are alive, signaling, and intact when they reach the patient. Below: the full breakdown.

On This Page
— Part One —

What's in a Wharton's Jelly stem cell vial.

Mesenchymal stem cells, exosomes, growth factors, hyaluronic acid, cytokines — every component that actually does the work, explained.

The Source
Wharton's JellyUmbilical Cord Matrix
Delivers
MSCs · ExosomesGrowth Factors · Hyaluronic Acid · Cytokines

Each component, explained.

Think of Wharton's Jelly as the treasure chest. Everything below is what's inside it — and what each piece does in regenerative biology.

01
Umbilical Cord Cross-Section Showing Wharton's Jelly Cross-section diagram of an umbilical cord showing the central vein, two arteries, and the surrounding Wharton's Jelly matrix. vein art. art. CROSS-SECTION
The Source

Wharton's Jelly

The gelatinous connective tissue that surrounds the vein and two arteries inside the umbilical cord. Named after Dr. Thomas Wharton who first described it in 1656, this mucoid matrix is composed primarily of collagen fibers, hyaluronic acid, proteoglycans, and a rich population of mesenchymal stem cells. It is one of the most studied sources of perinatal MSCs in the regenerative medicine literature — in part because it contains MSCs, exosomes, growth factors, hyaluronic acid, and collagen together in their native environment. When ATOM processes umbilical cord tissue, this is the starting material.

ATOM products are derived from the full Wharton's Jelly matrix — not isolated fragments of it.
02
Mesenchymal Stem Cell Illustration Stylized illustration of a living mesenchymal stem cell showing the cell membrane, cytoplasm, nucleus, and surrounding cytoskeletal projections. LIVING CELL
The Workers

MSCs(Mesenchymal Stem Cells)

Adult stem cells found throughout the body, including connective tissue, umbilical cord, and bone marrow. Per ISCT (International Society for Cell & Gene Therapy) criteria, MSCs are defined by three properties: plastic adherence, specific surface marker expression (CD73, CD90, CD105 positive; CD34, CD45 negative), and demonstrated trilineage differentiation potential toward osteoblasts (bone), adipocytes (fat), and chondroblasts (cartilage) in vitro. The regenerative medicine research literature also describes MSCs as active paracrine signalers — meaning much of what they do comes from the molecules they secrete, not just their direct differentiation.

ATOM products contain viable MSCs verified per-lot by independent lab analysis. Cell count and viability data ship with every Certificate of Analysis.
03
Exosome Cell-to-Cell Signaling Illustration of exosomes being secreted from a sender cell, traveling through extracellular space, and being received by a target cell. SENDER RECEIVER CELL SIGNALS
The Messages

Exosomes

Extracellular vesicles — nano-sized membrane-bound particles (typically 30–150 nm in diameter) that cells release into their environment. Exosomes are biogenically formed inside multivesicular bodies and secreted when those bodies fuse with the plasma membrane. They carry molecular cargo from their source cell: proteins, lipids, mRNA, microRNA, and other signaling molecules. In the research literature, exosomes are described as a primary mechanism of paracrine and endocrine cell-to-cell communication. Because they carry the signal without requiring a living cell, they are more physically stable than MSCs and can traverse tissue barriers.

ATOM products contain both MSCs and the exosomes they secrete — exosome-only products deliver cargo without the source cell; the full matrix delivers both.
04
Growth Factor Receptor Binding Illustration of growth factor proteins binding to specific receptors on the surface of target cells. GF GF GF RECEPTOR BINDING
The Instructions

Growth Factors

Signaling proteins that bind to specific receptors on the surface of target cells, triggering intracellular cascades that regulate cell behavior. Each growth factor family has a well-characterized receptor and a body of research describing its role in cell biology. Key growth factors characterized in Wharton's Jelly include VEGF (vascular endothelial growth factor) — studied extensively in angiogenesis research; TGF-β (transforming growth factor beta) — a multifunctional cytokine cited in cell differentiation and tissue biology; PDGF-BB (platelet-derived growth factor BB) — studied in connective tissue and vascular biology; and EGF (epidermal growth factor) — described in epithelial cell biology literature.

ATOM publishes per-lot growth factor quantification via independent university testing — concentrations documented, not claimed.
05
Hyaluronic Acid Water Retention Diagram Illustration of hyaluronic acid molecular chain binding water molecules to demonstrate its hydration capacity. H₂O H₂O H₂O WATER RETENTION
The Matrix

Hyaluronic Acid

A naturally occurring glycosaminoglycan composed of repeating disaccharide units of D-glucuronic acid and N-acetyl-D-glucosamine. It is a major structural component of the extracellular matrix in connective, epithelial, and neural tissues. The research literature describes its capacity to bind up to 1,000× its weight in water, giving it pronounced viscoelastic properties. In joints, HA is a primary constituent of synovial fluid. In tissue, it contributes to hydration and matrix organization. It is present natively in Wharton's Jelly — and it is what gives the jelly its characteristic texture.

HA in ATOM products is native to the Wharton's Jelly matrix — not added as a separate ingredient.
06
Cytokine Signaling Network Diagram showing a central cytokine connecting outward to multiple cellular signaling targets in the immune and tissue-repair network. SIGNALING NETWORK
The Regulators

Cytokines & Peptides

A broad category of small secreted proteins — including interleukins, chemokines, interferons, and tumor necrosis factors — that mediate communication in the immune and tissue-repair systems. Pro-inflammatory and anti-inflammatory cytokines act in balance: IL-6, IL-8, and TNF-α drive immune activation; IL-10, IL-4, and IL-1RA (interleukin-1 receptor antagonist) modulate in the opposite direction. Peptides are short amino acid chains that function similarly as signaling molecules. Together with growth factors, cytokines comprise the paracrine signaling milieu that defines the regenerative biology of Wharton's Jelly as described in the literature.

ATOM's per-lot testing at Ohio University Innovation Center includes quantification of IL-1RA as part of the published growth factor panel.

"Inside the Wharton's Jelly matrix, you have mesenchymal stem cells, the exosomes they secrete, growth factors, hyaluronic acid, and cytokines — all present together in their native environment. Some suppliers isolate one component of that system. ATOM supplies the whole matrix."

— Part Two —

How Wharton's Jelly stem cells are made.

Knowing what's in the vial is half the question. The other half is whether the lab method preserved any of it. This is where most stem cell suppliers cut corners — and where ATOM doesn't.

Patented Method

Explant culture in concentrated Wharton's Jelly filtrate.

We don't enzymatically digest the umbilical cord. We don't mechanically shred it. We let the cells migrate naturally out of intact Wharton's Jelly tissue — gradually, over time, in the presence of concentrated Wharton's Jelly filtrate that recreates the cells' native biochemical environment.

The filtrate is patented technology. No other lab can legally produce or use it. It supplies the same extracellular matrix and niche signals the cells were already living in — which means they don't drift, don't stress, and don't lose the primitive markers that define a clinically potent MSC during expansion.

Together, the explant method and the addition of concentrated Wharton's Jelly filtrate enrich a more primitive WJ-MSC population, improve preservation, and enhance stemness markers across passages. Every other supplier compromises here. We don't have to.

SSEA-3 verified CD73 + CD90 + CD105 + High proliferative capacity Multipotent

Six questions most stem cell suppliers hope you never ask.

Take this list to your current supplier. See how they answer.

01

"Low passage" — but what's the actual PDL?

Most Suppliers

Market cells as "low passage" without disclosing population doublings. One passage can mean up to 10 doublings, depending on culture density. Passage 3 can equal PDL 30 — past the point where MSCs accumulate genetic drift, telomere shortening, and silent loss of function.

ATOM

Every cord is tracked by Population Doubling Level (PDL), not just passage. We cap every product at PDL 18 or fewer. Once a line hits that threshold, we move to a new cord. No exceptions.

Why it matters: Cells that haven't aged out. Full multipotency intact. No silent loss of function masked by a "passage 2" label.

02

2D plastic flask, or 3D bioreactor?

Most Suppliers

Grow cells in flat 2D culture flasks. It's cheap and scales easily. It also forces cells into an unnatural sheet geometry that alters gene expression and reduces potency compared to their native 3D environment.

ATOM

3D bioreactor culture. Cells grow in three dimensions — the way they live in tissue. More technically demanding. More expensive at small scale. The only way to expand cells while preserving native phenotype.

Why it matters: Cells behave like cells, not flattened survivors of plastic. Higher potency per cell injected.

03

Bovine serum, platelet lysate, or fully defined media?

Most Suppliers

Use fetal bovine serum or, at best, human platelet lysate. Bovine serum coats cells in animal protein — which the recipient's immune system reads as foreign. Result: increased immunogenicity and inflammatory reactions on injection.

ATOM

Fully defined, animal-product-free media. Zero non-human protein contamination. Cells grow in a chemically controlled environment with no foreign antigens to carry into the patient.

Why it matters: Lower immunogenicity. Cleaner clinical response. No surprise inflammatory reactions tied to the culture, not the patient.

04

Peptide cryo, or DMSO cryo?

Most Suppliers

Increasingly market peptide-based "wash-free" cryopreservation media — convenient, but typically derived from non-human sources (often fish proteins). Anything non-human is potentially immunogenic, and post-thaw viability is documented to be lower than DMSO.

ATOM

DMSO-based cryopreservation — the documented gold standard for post-thaw cell viability. Yes, it requires a brief wash step before injection. The wash takes minutes. The viability advantage carries the entire treatment.

Why it matters: The cells you inject are alive. Period. Five minutes of prep for cells that actually engraft and signal.

05

Particle counts, or characterized exosomes?

Most Suppliers

Report "particle counts" measured by light scattering and label the result as exosomes. A particle count includes cellular debris, protein aggregates, and lipid fragments alongside true exosomes. Inflated numbers, real-world potency unknown.

ATOM

True exosomes characterized by protein-marker verification — not particle scattering. The number on our label reflects therapeutic vesicles, not background noise.

Why it matters: You're paying for therapeutic exosomes. You should actually be receiving them.

06

Lyophilized exosomes, or vitrified / frozen?

Most Suppliers

Lyophilize (freeze-dry) exosomes for shelf-stable shipping. The freeze-drying process destroys the lipid bilayer that holds exosomal RNA. The RNA signaling — the actual mechanism of regenerative effect — is lost. What's left is a peptide cocktail with the word "exosome" on the label.

ATOM

Vitrification or frozen-state preservation. Lipid bilayers stay intact. RNA signaling is preserved. The exosome arrives at the clinic functional — peptides, RNA, and structure all delivered.

Why it matters: Full exosome biology in the syringe — not just leftover peptides after the active machinery has been destroyed.

— Part Three —

The result.

When the matrix is intact and the lab method respects the biology, the difference at the clinical level is not subtle.

Bottom Line

The same vial volume. A different category of biology.

Same dose volume. Same injection protocol. Materially different cell count, cell potency, and exosome integrity arriving at the patient.

Up to 100×
More viable MSCs per vial
vs. competing WJ products
≤ 18
PDL cap — never exceeded.
Then we move to a new cord.
0
Animal proteins, fish peptides,
or non-human contaminants
View Products See Lab Reports
Frequently Asked

Stem cell supplier questions, answered.

The questions clinics, med spas, IV practices, and orthopedic providers ask us most often when evaluating Wharton's Jelly mesenchymal stem cell suppliers.

What are Wharton's Jelly stem cells?+
Wharton's Jelly stem cells are mesenchymal stem cells (MSCs) isolated from the gelatinous connective tissue inside the umbilical cord. Wharton's Jelly is one of the most studied sources of perinatal MSCs in the regenerative medicine literature because it contains MSCs, exosomes, growth factors, hyaluronic acid, and cytokines together in their native environment. Per ISCT criteria, these cells are CD73, CD90, and CD105 positive and demonstrate trilineage differentiation potential toward bone, fat, and cartilage. Learn more about each component in the matrix.
How are Wharton's Jelly MSCs different from bone marrow stem cells?+
Wharton's Jelly MSCs are perinatal — sourced from umbilical cord tissue donated at the time of birth — while bone marrow MSCs require an invasive aspiration from a living adult donor. WJ-MSCs are typically reported in the literature to have higher proliferative capacity, lower immunogenicity due to their early developmental stage, and easier scalable sourcing. ATOM's WJ-MSCs are also expanded in patented Wharton's Jelly filtrate, which preserves the primitive phenotype during culture better than standard expansion methods.
How many viable stem cells are in a vial of ATOM product?+
Cell count and viability are verified per-lot by independent laboratory analysis and ship with the Certificate of Analysis on every order. ATOM products contain up to 100× more viable MSCs per vial compared to competing Wharton's Jelly products on the market, due to ATOM's patented explant-culture method, 3D bioreactor expansion, and DMSO-based cryopreservation that preserves post-thaw viability. Specific cell counts vary by product (Atom IV, Atom Injection, Atom MUSE) — see current product specifications for per-lot values.
Are ATOM Stem Cells FDA approved?+
ATOM supplies HCT/Ps (human cells, tissues, and cellular and tissue-based products) under 21 CFR Part 1271. Stem cell products are not FDA-approved as drugs for the diagnosis, treatment, cure, or prevention of any disease or medical condition. ATOM products are sourced from FDA-registered, AATB- and AABB-compliant tissue facilities. Intended use, administration route, and clinical application are determined solely by the licensed treating provider within their scope of practice.
What is the difference between exosomes and stem cells?+
Stem cells are living cells capable of self-renewal and differentiation. Exosomes are nano-sized membrane-bound vesicles (30–150 nm) that cells secrete to communicate with other cells. Exosomes carry molecular cargo from their source cell — proteins, lipids, mRNA, microRNA — and are described in the literature as a primary mechanism of paracrine cell-to-cell signaling. Exosome-only products deliver the cargo without the source cell. ATOM's full-matrix products contain both viable MSCs and the exosomes those cells secreted, preserved together in their native Wharton's Jelly environment.
What is Population Doubling Level (PDL) and why does it matter for stem cell quality?+
Population Doubling Level (PDL) measures how many times a cell population has divided. It is a more accurate measure of cell age than passage number, because one passage can represent up to 10 doublings depending on culture density. After approximately 20–25 PDL, MSCs begin to accumulate genetic drift and telomere shortening, which reduces multipotency and clinical potency. ATOM caps every product at PDL 18 or fewer — once a cell line reaches that threshold, ATOM moves to a new umbilical cord. Many suppliers market "low passage" cells without disclosing PDL, which can mask significantly aged cells.
What certifications should a stem cell supplier have?+
A reputable Wharton's Jelly stem cell supplier should source from FDA-registered tissue facilities, follow AATB (American Association of Tissue Banks) and AABB (Association for the Advancement of Blood & Biotherapies) guidelines, provide a Certificate of Analysis with every unit, document chain of custody from donor consent to delivery, and conduct independent third-party verification of cell count, viability, and growth factor concentrations. ATOM publishes per-lot lab verification through Eurofins DPT and the Ohio University Innovation Center. View our lab reports.
How does ATOM ship stem cell products to clinics?+
ATOM ships under validated cold chain protocols using temperature-controlled containers with cryogenic shippers for frozen MSC and exosome products. Every shipment includes a Certificate of Analysis with per-lot cell count, viability, and growth factor data. Products are shipped to licensed medical providers and clinical practices in the United States. For ordering, partner program details, and current pricing, see the products page or contact ATOM directly.
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