Definitions of key terms in exosome biology, regenerative medicine, compounding pharmacy, and longevity science. Written for licensed practitioners and biohacking coaches.
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503A Compounding
Traditional pharmacy compounding regulated under Section 503A of the Federal Food, Drug, and Cosmetic Act. 503A pharmacies prepare customized medications for individual patients based on valid prescriptions from licensed practitioners. They operate under state pharmacy board oversight and USP standards. 503A preparations are not FDA-approved as finished drug products and cannot be made in anticipation of prescriptions (i.e., cannot be stockpiled). Volume is limited to patient-specific orders.
A higher-regulatory-tier compounding framework established by DQSA 2013. 503B outsourcing facilities are registered with the FDA, comply with current Good Manufacturing Practices (cGMP), and are subject to FDA inspection. They may compound without patient-specific prescriptions and distribute to licensed healthcare facilities in bulk. ExaVeyra does not work with a 503B outsourcing facility.
A medical specialty focused on cosmetic procedures and treatments that enhance appearance and promote skin health. Aesthetic medicine practitioners (dermatologists, plastic surgeons, med spa physicians) commonly use exosomes in combination with microneedling, laser resurfacing, and other procedural treatments. Practitioners apply exosomes topically to the skin, including after these procedures. ExaVeyra Sciences supplies aesthetic medicine clinics and med spas with wholesale biologics.
A treatment using biological material derived from the patient's own body. PRP is the most common autologous biologic in regenerative medicine: the patient's blood is drawn, processed, and reinjected. Autologous therapies eliminate allogeneic immune rejection risk but are limited by the patient's own biological quality (age, health status). In contrast, MSC-derived exosomes are allogeneic (from donor cells) and are manufactured to consistent quality standards independent of patient biology.
A treatment using biological material derived from a donor rather than the patient themselves. MSC-derived exosomes are allogeneic: they are produced from screened donor cell lines under cGMP manufacturing conditions and supplied to multiple patients. Allogeneic products offer consistency and scalability advantages over autologous preparations, but require rigorous safety testing including donor screening, sterility, and immunogenicity characterization. The non-cellular nature of exosomes (they are acellular vesicles) gives them a favorable immunogenic profile compared to whole allogeneic cell therapies.
The most common form of hair loss in both men and women, driven by genetic sensitivity to dihydrotestosterone (DHT) and progressive miniaturization of hair follicles. It presents as a receding hairline and crown thinning in men (male-pattern baldness) and diffuse thinning at the crown in women. Standard treatments include minoxidil, finasteride (men), and PRP therapy. MSC-derived exosome applications in androgenetic alopecia are an active research area, with proposed mechanisms involving Wnt/beta-catenin pathway signaling and dermal papilla cell support.
A synthetic peptide derived from a protein found in human gastric juice, studied for its effects on tissue repair, tendon healing, and gut mucosal protection in animal models. BPC-157 (Body Protective Compound) is frequently used in biohacking and sports medicine contexts for its purported regenerative properties. It is not FDA-approved as a finished drug product. Availability of BPC-157 depends on federal 503A bulk-substance eligibility and state board rules, always on a patient-specific prescription; ask your account manager. The human clinical evidence base is limited.
A broad movement and practice of using science, technology, and behavioral interventions to optimize human biology, performance, and longevity. In the health context, biohacking encompasses nutrigenomics, peptide protocols, exosome use, NAD+ supplementation, photobiomodulation, continuous glucose monitoring, sleep optimization, and other quantified-self approaches. Biohacking coaches and longevity practitioners often work with licensed physicians to access clinical-grade biologics and regenerative products through compliant B2B supply channels.
A set of regulatory standards enforced by the FDA governing the manufacturing, processing, packing, and holding of drugs to ensure quality, safety, and consistency. cGMP requirements cover facility design, equipment qualification, process validation, personnel training, quality control, and documentation. In the context of exosome products, cGMP manufacturing is the benchmark for quality assurance. Products from cGMP-certified facilities carry significantly stronger regulatory documentation than those from non-compliant sources.
A quality documentation document issued by a manufacturer that reports the results of testing performed on a specific lot of product. For ExaVeyra catalog exosome products, a complete COA should include HPLC, RNA quantification assay, and NanoSight NTA characterization, plus sterility testing results (aerobic, anaerobic, mycoplasma), endotoxin levels by LAL assay, and lot traceability information. Practitioners should request lot-specific COAs, not generic or undated documents.
Small signaling proteins secreted by cells that mediate and regulate immunity, inflammation, and tissue homeostasis. Cytokines include interleukins (IL-1, IL-6, IL-10, etc.), interferons, tumor necrosis factors, and chemokines. MSC-derived exosomes carry anti-inflammatory cytokine profiles that may modulate immune responses in recipient tissues. In regenerative contexts, the immunomodulatory cytokine cargo of MSC exosomes is considered a key mechanism underlying their research-stage anti-inflammatory effects.
a, Research samples packed in dry ice on a laboratory bench. Dry ice is a common refrigerant for frozen shipments.Image: Karolina Fokcreditb, Insulated expanded polystyrene shippers, the kind of container commonly used for frozen cold-chain shipments.Image: Kennycredit
A temperature-controlled supply chain designed to maintain biological products within specified temperature ranges throughout storage and transportation. For exosome products, cold-chain typically means continuous frozen storage at -20C or -80C from manufacturing to final delivery, with validated shipping containers and temperature monitoring. Cold-chain integrity is a critical quality parameter: temperature excursions can degrade exosome membrane integrity and cargo activity. Reputable suppliers provide cold-chain shipping validation documentation.
Injectable substances used in aesthetic medicine to restore facial volume, smooth wrinkles, and augment facial features. Common filler materials include hyaluronic acid (Juvederm, Restylane), calcium hydroxylapatite (Radiesse), and poly-L-lactic acid (Sculptra). Exosomes are not dermal fillers; they are biologics studied for skin biology modulation at the cellular level. Some practitioners apply exosomes topically after aesthetic procedures such as microneedling.
Small membrane-bound extracellular vesicles, typically 30 to 150 nanometers in diameter, secreted by virtually all cell types. Exosomes carry a complex cargo of proteins, lipids, messenger RNAs, and microRNAs that reflects the biology of their parent cell. Their primary biological role is intercellular communication: they deliver molecular signals from one cell to another, influencing gene expression and cellular behavior in recipient tissues. In regenerative medicine, MSC-derived exosomes are the most studied class due to their anti-inflammatory and tissue-supportive cargo.
Fig. 2 | Small extracellular vesicles imaged by transmission electron microscopy. Scale bar 100 nm.Image: Malvicini R et al.credit
The umbrella category encompassing all membrane-bound particles released by cells into the extracellular space. EVs include exosomes (30-150nm, formed inside endosomes), microvesicles (50-1000nm, budded from the plasma membrane), and apoptotic bodies (>1000nm, released during cell death). In scientific literature, "exosome" is often used loosely to refer to the small EV fraction. Precise nomenclature differentiates by size and biogenesis pathway.
Endotoxins are lipopolysaccharide (LPS) components of gram-negative bacterial cell walls that cause fever, inflammation, and septic shock when present in parenteral products above threshold levels. The Limulus Amebocyte Lysate (LAL) assay is the standard pharmacopeial test for detecting and quantifying bacterial endotoxins in parenteral preparations. Biologic products, including exosome preparations, are tested for endotoxin by LAL. A complete COA includes the endotoxin result in EU/mL with the specification limit.
A systems biology-based approach to medicine that focuses on identifying and addressing the root causes of disease rather than treating symptoms. Functional medicine practitioners consider genetics, environment, and lifestyle factors in developing individualized treatment plans. They frequently incorporate regenerative biologics, peptide protocols, nutritional interventions, and hormone optimization. Many functional medicine practices and longevity clinics source exosome formulations wholesale and send compounded prescriptions to a 503A pharmacy.
Proteins that bind to cell surface receptors and regulate cell growth, proliferation, differentiation, and survival. Key growth factors relevant to regenerative medicine include PDGF (platelet-derived growth factor), TGF-beta (transforming growth factor beta), VEGF (vascular endothelial growth factor), EGF (epidermal growth factor), and KGF (keratinocyte growth factor). Exosomes derived from MSCs carry many of these growth factors as cargo, which is one mechanism proposed for their regenerative effects in research settings.
An incretin hormone produced by intestinal L-cells in response to food intake that stimulates insulin secretion, suppresses glucagon, slows gastric emptying, and reduces appetite. GLP-1 receptor agonists (semaglutide, tirzepatide) are FDA-approved for type 2 diabetes and obesity management. Compounded GLP-1 preparations are dispensed by our 503A pharmacy partner on a patient-specific prescription, where a prescriber documents a patient need the commercially available product does not meet.
An approach to healthcare that combines conventional evidence-based medicine with complementary therapies, emphasizing whole-person care and the therapeutic relationship. Integrative medicine practices increasingly incorporate regenerative interventions such as exosomes, peptide protocols, and IV nutritional infusions alongside conventional treatments. Like functional medicine practitioners, integrative medicine physicians often access wholesale biologics through NPI-verified wholesale suppliers.
A freeze-drying process that removes water from biological materials under vacuum at low temperatures, converting them to a stable powder or cake form. It is widely used for peptides, enzymes, and other small-molecule or biologic drug products to extend shelf life. Liquid exosome suspensions, by contrast, are typically distributed on cold-chain with refrigerated storage per manufacturer specifications. Lyophilization is a standard preservation method for many cGMP biologic products.
An emerging medical specialty focused on extending healthspan (years of healthy function) rather than merely lifespan. Longevity medicine practitioners draw from geroscience, epigenetics, metabolomics, and regenerative biology to design personalized interventions addressing the hallmarks of aging: genomic instability, telomere attrition, epigenetic alterations, loss of proteostasis, mitochondrial dysfunction, and cellular senescence. Products used in longevity protocols include NAD+ precursors, peptides, senolytics, exosomes, and GLP-1 compounds.
Mesenchymal stem cells are multipotent stromal cells capable of differentiating into bone, cartilage, and fat cells. They are found in bone marrow, adipose tissue, and umbilical cord Wharton's jelly. In regenerative medicine, MSCs are primarily valued not for their differentiation potential but for their paracrine signaling: they secrete exosomes and other molecules with anti-inflammatory, immunomodulatory, and tissue-supportive properties. MSC-derived exosome preparations are cell-free vesicle products and are not stem cell therapies. MSC-derived exosomes account for approximately 61% of interventional extracellular vesicle studies on ClinicalTrials.gov as of 2025.
Small non-coding RNA molecules (approximately 22 nucleotides) that regulate gene expression at the post-transcriptional level by binding to complementary sequences in messenger RNA targets. Exosomes are particularly rich in miRNA cargo, and this miRNA delivery is considered one of the primary mechanisms by which exosomes influence recipient cell behavior. Different cell sources produce exosomes with distinct miRNA profiles; MSC-derived exosome miRNA cargo is associated with anti-inflammatory and tissue-reparative signaling in current research.
A coenzyme found in all living cells that plays a central role in energy metabolism, DNA repair, and cellular signaling. NAD+ levels decline with age, and supplementation or precursor therapy (NMN, NR) is a major focus of longevity medicine and biohacking protocols. NAD+ infusion therapy is offered by many functional medicine and longevity research clinics. In biohacking contexts, NAD+ is considered a foundational intervention for mitochondrial health and cellular rejuvenation.
Fig. 3 | A nanoparticle tracking analysis frame showing particles and their tracked paths.Image: Thegnarlypandacredit
A technology for measuring the size distribution of nanoparticles in liquid suspension. NanoSight NTA tracks the Brownian motion of individual particles under laser illumination and uses this data to calculate hydrodynamic diameter and size distribution. Manufacturers commonly use NTA alongside other methods to characterize vesicle products. Practitioners should review lot-specific NTA methodology and size-distribution data on the COA rather than relying on marketing particle-count figures alone.
An autologous biologic prepared by centrifuging a patient's own blood to concentrate platelets above baseline. Platelets contain growth factors (PDGF, TGF-beta, VEGF, EGF) that are released upon activation and may support tissue repair and regeneration. PRP has been used in orthopedics, sports medicine, dermatology, and hair restoration. Unlike exosomes, PRP is patient-derived and variable in composition. It is typically classified under 21 CFR Part 1271 as a minimally manipulated HCT/P when used homologously.
Short chains of amino acids (typically 2-50 residues) that serve as signaling molecules in the body, influencing hormone regulation, immune function, tissue repair, metabolism, and neurological activity. Bioactive peptides used in longevity and regenerative medicine include BPC-157, TB-500 (Thymosin Beta-4 fragment), CJC-1295, Ipamorelin, and others. Compounded peptides must be prepared from a bulk substance that qualifies under section 503A; see the clinic-launch guide on buying peptides.
Fig. 4 | Two amino acids joined by a peptide bond, with water released.Image: GYassineMrabetcredit
A form of cell communication in which a cell secretes chemical signals that act on neighboring cells at short range. Paracrine signaling contrasts with endocrine signaling (hormones acting over long distances) and autocrine signaling (a cell responding to its own signals). MSCs are believed to exert many of their therapeutic effects through paracrine mechanisms: rather than directly differentiating into tissue cells, they secrete exosomes and other molecules that signal local resident cells to repair and regenerate. This paracrine model is now the dominant framework for understanding MSC therapeutic biology.
A branch of medicine focused on replacing, engineering, or regenerating human cells, tissues, or organs to restore or establish normal function. Regenerative medicine approaches include cell therapies, tissue engineering, gene therapies, and biologic interventions such as PRP, exosomes, and growth factor preparations. The field sits at the intersection of biology, materials science, and clinical medicine. Regulatory oversight varies by product type, intended use, and manufacturing method.
Agents that selectively clear senescent cells (aged, dysfunctional cells that have stopped dividing but resist apoptosis) from tissues. Senescent cells accumulate with age and secrete a pro-inflammatory cocktail called the Senescence-Associated Secretory Phenotype (SASP) that drives tissue dysfunction. Senolytics under research include dasatinib, quercetin, navitoclax, and others. Senolytic protocols are a key focus in longevity medicine and are often combined with other regenerative interventions including exosomes and peptides.
Fig. 2Malvicini R, Santa-Cruz D, Tolomeo AM, Muraca M, Yannarelli G, Pacienza N, PLOS ONE, CC BY 4.0. Malvicini R, Santa-Cruz D, Tolomeo AM, Muraca M, Yannarelli G, Pacienza N. Ion exchange chromatography as a simple and scalable method to isolate biologically active small extracellular vesicles from conditioned media. PLoS One. 2023;18(9):e0291589. DOI article. Panel "Fr. 3" of Fig 3, cropped (label removed); CC BY 4.0. ↩
ExaVeyra Sciences supplies NPI-verified practitioners with cGMP exosome formulations and devices, and refers prescribers to our 503A pharmacy partner for compounded preparations dispensed on a patient-specific prescription.
