When evaluating where to price and buy Follistatin for laboratory inquiry, research institutions must prioritize verified sequence identity, quantitative purity, and documented endotoxin testing over unvalidated supplier pricing. PX1 Research provides analytical-grade Follistatin peptides synthesized under strict ISO 17025 and GMP-compliant conditions, backed by lot-specific COAs including RP-HPLC and ESI-MS reports for qualified academic and industrial investigators.
When evaluating where to price and buy Follistatin for laboratory inquiry, research institutions must prioritize verified sequence identity, quantitative purity, and documented endotoxin testing over unvalidated supplier pricing. PX1 Research provides analytical-grade Follistatin peptides synthesized under strict ISO 17025 and GMP-compliant conditions, backed by lot-specific COAs including RP-HPLC and ESI-MS reports for qualified academic and industrial investigators.
To price and buy Follistatin for scientific research, laboratories must assess costs relative to sequence purity, quantitative mass spectrometry validation, endotoxin compliance, and batch-to-batch consistency rather than raw unit cost alone. Research-grade Follistatin varies in price based on isoform specification (such as Follistatin-344 or Follistatin-315), synthesis method, and the depth of analytical verification provided by the manufacturer.
PX1 Research supplies USA-manufactured Follistatin exclusively for in vitro and preclinical research applications. Every lot undergoes independent third-party verification, including Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) and Electrospray Ionization Mass Spectrometry (ESI-MS), ensuring investigators receive validated sequence fidelity and purity exceeding 98%. Facilities can order directly through our secure catalog or access our institutional wholesale portal for high-volume research projects.
Follistatin (FST) is an autocrine, single-chain glycoprotein expressed across diverse tissue types, primary among them skeletal muscle, gonadal tissue, and vascular endothelium. Structurally, the peptide contains an N-terminal domain followed by three follistatin domains (FS1, FS2, and FS3), each containing conserved cysteine residues that form intricate disulfide-bond networks essential for structural stability and target binding affinity.
Alternative splicing of the *FST* gene yields distinct functional isoforms that differ in C-terminal length and heparin-binding capability. Follistatin-344 (FST-344) serves as a precursor protein that undergoes post-translational proteolytic cleavage to form Follistatin-300, a circulating monomer with high affinity for target ligands. Conversely, Follistatin-315 (FST-315) represents the predominant naturally circulating isoform, retaining a carboxyl-terminal extension that modulates tissue tethering. Laboratories seeking to study specific binding dynamics can review our specialized Follistatin-344 research compound documentation for detailed structural specifications.
In cell culture models and tissue-explant systems, these structural variations alter cellular retention rates and biological half-life. Understanding these differences allows principal investigators to select the precise sequence variant required for their specific assay protocols.
The primary biochemical mechanism of Follistatin involves the high-affinity neutralization of specific transformational growth factor-beta (TGF-β) superfamily ligands, most notably Activin A and Myostatin (Growth Differentiation Factor 8, or GDF-8). In vitro binding assays demonstrate that Follistatin encircles Activin A and Myostatin molecules in a 2:1 stoichiometric complex, effectively masking the receptor-binding epitopes required for interaction with Activin Type II receptors (ActRIIA and ActRIIB).
By preventing ligand binding to ActRIIB, Follistatin inhibits downstream Smad2/Smad3 phosphorylation cascades. Preclinical studies suggest that suppressing Smad2/3 signaling reduces the transcription of muscle-atrophy-related ubiquitin ligases, such as MuRF1 and MAFbx (Atrogin-1). In rodent models, localized neutralization of GDF-8 through recombinant Follistatin administration has been observed to alter protein synthesis rates and preserve lean tissue mass under simulated catabolic conditions.
Additionally, preclinical data indicate that Follistatin interacts with Bone Morphogenetic Proteins (BMPs), including BMP-6 and BMP-7, albeit with lower affinity than its interaction with Activin A. Investigators studying cell differentiation, tissue repair, and extracellular matrix remodeling can find additional background documentation within our PX1 Research Library hub.
When analyzing options to price and buy Follistatin online, research buyers encounter significant price variance across different reagent vendors. These pricing disparities stem directly from manufacturing standards, purification methodologies, and quality verification steps implemented during synthesis. Cheaper raw peptides often bypass comprehensive purification or omit mandatory endotoxin screening.
Key factors dictating authentic research peptide pricing include:
1. Synthesis and Purification Efficiency: Producing full-length or truncated recombinant Follistatin sequences with precise disulfide-bond pairing requires complex folding protocols and multi-stage RP-HPLC purification steps.
2. Comprehensive Analytical Verification: Third-party verification via High-Resolution Mass Spectrometry (HRMS) and quantitative HPLC adds baseline cost but guarantees batch purity and sequence accuracy.
3. Endotoxin Testing Standards: Bioresearch applications mandate low endotoxin thresholds. Utilizing Limulus Amebocyte Lysate (LAL) chromogenic assays ensures peptide lots do not induce non-specific inflammatory signaling in cell cultures.
Purchasing unverified compounds to minimize laboratory expenditure risks introducing baseline noise, cytotoxicity, or irreproducible data into experimental models. Inspecting raw analytical data prior to purchase ensures laboratory capital is invested in reliable reagents.
To contextualize Follistatin within muscle biology and TGF-β pathway research, scientists frequently compare its binding kinetics and specificity against other regulatory peptides within the same signaling network. Browse our full catalog of all research peptides to compare specifications across our entire analytical library.
The following comparative table summarizes structural and functional distinctions among key compounds within this research class:
PX1 Research mandates strict analytical testing for every lot of Follistatin released to the scientific community. To ensure complete transparency, lot-specific Certificates of Analysis (COAs) are accessible directly to research clients, detailing quantitative results from certified ISO 17025 laboratory environments.
Purity is determined using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) utilizing gradient elution. High-purity Follistatin lots must demonstrate a sharp, symmetrical single peak representing >98% total peak area, confirming the absence of truncated peptide fragments or chemical impurities. Electrospray Ionization Mass Spectrometry (ESI-MS) further confirms the precise molecular weight of the compound, ensuring accurate amino acid sequence assembly.
Furthermore, because bacterial expression systems or liquid-phase synthesis pathways can introduce residual lipopolysaccharides, every PX1 Follistatin batch undergoes stringent LAL endotoxin testing. Endotoxin levels are maintained strictly within acceptable limits (<0.1 EU/μg), protecting sensitive cell lines and tissue explants from endotoxin-induced background responses.
Follistatin is supplied as a sterile, lyophilized cake or powder to preserve peptide integrity during ambient transit. Proper reconstitution technique is critical to maintain protein tertiary structure and prevent aggregation prior to experimental use.
Reconstitution should be performed in a certified biosafety cabinet using sterile, ultra-pure water or phosphate-buffered saline (PBS, pH 7.4). For long-term liquid stability, adding a carrier protein such as 0.1% Bovine Serum Albumin (BSA) or Human Serum Albumin (HSA) is recommended to prevent non-specific adsorption of the peptide to plastic microcentrifuge tubes or glass vials.
The lyophilized powder should be gently dissolved by swirling the vial or allowing solvent to run slowly down the inner vial wall. High-shear vortexing or vigorous shaking must be avoided, as mechanical shear forces can disrupt delicate tertiary protein folds and lead to denaturation. For detailed laboratory handling guidelines, refer to our protocol guide on growth factor signaling protocols.
Lyophilized Follistatin exhibits stability at room temperature for short periods during shipping; however, upon receipt, research specimens should immediately be stored in a temperature-controlled freezer at -20°C or -80°C for long-term preservation. Under proper desiccation and sub-zero storage conditions, lyophilized Follistatin retains structural activity for up to 24 months.
Once reconstituted into aqueous solution, aliquots should be divided into single-use working volumes and stored at -20°C or colder to prevent repeated freeze-thaw cycles. Multiple freeze-thaw events induce physical stress on protein tertiary structure, causing irreversible aggregation and loss of functional binding capacity. Reconstituted solutions stored at 2°C to 8°C should be utilized within 48 to 72 hours.
PX1 Research operates dedicated fulfillment centers in California and Arizona, providing same-day dispatch for orders placed Monday through Friday prior to cutoff times. Fast domestic shipping ensures minimal transit exposure, preserving compound stability upon arrival at host facilities.
PX1 Research supports university laboratories, biotechnology enterprises, and contract research organizations (CROs) requiring dependable supply chains for continuous testing cycles. We provide scalable supply agreements, bulk manufacturing batches, and custom packaging formats tailored to automated liquid handling systems.
Institutional accounts benefit from dedicated account management, advance lot-reservation services, and direct access to master analytical files. Academic and corporate researchers looking to establish institutional procurement terms or secure volume pricing are encouraged to visit our institutional wholesale portal or submit inquiries to our technical compliance team.
What is the primary factor influencing the price when I buy Follistatin?
The price of research-grade Follistatin is determined primarily by peptide purity levels (typically verified >98% via RP-HPLC), rigorous third-party mass spectrometry identity verification, low endotoxin thresholds (<0.1 EU/μg), and the complexity of recombinant or synthetic production protocols.
What is the functional difference between Follistatin-344 and Follistatin-315 in preclinical research?
Follistatin-344 acts as a precursor peptide that is processed into tissue-targeted isoforms, whereas Follistatin-315 is the primary naturally circulating isoform containing an extended C-terminal tail that modulates cell-surface heparin binding dynamics.
How is Follistatin purity verified at PX1 Research?
Every lot of Follistatin undergoes dual analytical testing using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) for purity assessment and Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm exact molecular weight, alongside LAL assays for endotoxin quantification.
What solvent is recommended for reconstituting lyophilized Follistatin for in vitro assays?
Follistatin should be reconstituted using sterile, deionized water or phosphate-buffered saline (PBS, pH 7.4). Adding 0.1% BSA or HSA as a carrier protein helps minimize non-specific peptide binding to plastic container surfaces.
What are the recommended storage conditions for Follistatin peptides?
Lyophilized Follistatin should be stored long-term at -20°C or -80°C. Once reconstituted, solution aliquots should be frozen at -20°C or below to avoid degradation. Repeated freeze-thaw cycles must be avoided.
Does PX1 Research provide Certificates of Analysis (COA) with Follistatin orders?
Yes. Every shipment includes or provides digital access to a lot-specific Certificate of Analysis containing complete RP-HPLC chromatograms, mass spectrometry spectra, and endotoxin assay results from an independent ISO 17025 accredited laboratory.
Where does PX1 Research ship Follistatin orders from?
All PX1 Research compounds are manufactured in the USA and shipped directly from our primary fulfillment hubs located in California and Arizona, offering same-day shipping on orders placed Monday through Friday before cutoff times.
Is Follistatin supplied by PX1 Research approved for animal or human administration?
No. All compounds supplied by PX1 Research, including Follistatin, are intended strictly for in vitro laboratory research and preclinical scientific study. They are not cleared or intended for human, clinical, therapeutic, or veterinary use.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.