Follistatin 344 is a recombinant form of the naturally occurring glycoprotein follistatin, which binds and neutralizes members of the TGF-β superfamily  most notably myostatin (GDF-8) and activin A. By inhibiting myostatin, Follistatin 344 effectively removes the natural 'brake' on muscle growth, making it one of the most powerful tools in muscle biology research. Animal studies have demonstrated dramatic increases in muscle mass following follistatin administration. The '344' designation refers to the amino acid count of this specific splice variant, which is the most commonly used form in research. Due to the complexity of this protein, it requires careful handling and cold-chain logistics. Available in research-grade lyophilized form.
| Molecular Weight | ~38 kDa |
| Purity | ≥95% (SDS-PAGE) |
| Form | Lyophilized powder |
| Storage | -80°C to -20°C |
| Source | Recombinant (E. coli or HEK293) |
According to comprehensive reviews in the Journal of Peptide Science, synthetic therapeutic peptides represent one of the fastest-growing segments of the pharmaceutical industry.
Research published in Trends in Pharmacological Sciences (2023) highlights the importance of peptide purity exceeding 99% for reproducible preclinical research outcomes.
Recombinant protein that inhibits myostatin signaling  a key research tool for muscle growth, body composition, and metabolic studies.
We supply Follistatin 344 at ≥95% (SDS-PAGE) purity. Higher purity grades are available for pharmaceutical applications upon request.
Minimum order quantities for wholesale Follistatin 344 depend on the quantity and purity grade required. Contact our sales team for specific pricing and MOQ information.
Follistatin 344 should be stored at -80°C to -20°C in a desiccated environment. Proper cold-chain shipping is maintained for all deliveries.
Every batch includes a comprehensive Certificate of Analysis with HPLC purity data (≥99%), mass spectrometry confirmation, amino acid analysis, endotoxin testing (<0.5 EU/mg), and residual solvent analysis per ICH Q3C guidelines.
In-stock peptides are dispatched within 48 hours of order confirmation. International delivery takes 5–7 business days via temperature-controlled shipping. Express 2–3 day options available. Our on-time delivery rate is 99.2%.
Yes. Dr. Peptides provides Drug Master File (DMF) documentation, Certificates of Origin, MSDS/SDS in multiple languages, and stability data packages compliant with ICH guidelines for regulatory submissions.
Dr. Peptides offers a 100% money-back quality guarantee. If any product fails to meet the purity specifications stated on its Certificate of Analysis, we provide a full replacement or refund within 48 hours of claim receipt.
All shipments use pharmaceutical-grade insulated packaging with qualified gel packs maintaining 2–8°C for up to 96 hours. Each package includes a temperature data logger for verification upon receipt, per WHO guidelines for temperature-sensitive pharmaceuticals.
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