Where to Buy Follistatin in 2026

Follistatin is a single-chain glycoprotein expressed in nearly all tissues. It functions primarily as a binding protein that neutralizes members of the TGF-β superfamily, particularly activin and myostatin. Key research areas include:

• Myostatin inhibition — By binding and neutralizing myostatin, Follistatin removes a key negative regulator of muscle growth. Research in animal models shows significant muscle mass increases
• Activin antagonism — Follistatin regulates activin's effects on FSH secretion, inflammation, and fibrosis
• Reproductive biology — Important role in folliculogenesis and reproductive endocrinology research
• Tissue remodeling — Studies explore effects on cardiac and hepatic fibrosis models

Follistatin 344 is the full-length isoform that undergoes post-translational processing, making it the most versatile variant for research applications.

Follistatin is sold for research purposes only. Not intended for human consumption.

Follistatin is a complex protein that requires recombinant production, making vendor selection critical for obtaining bioactive product. Our recommendation:

1. Ascension Peptides (Top Pick)

Ascension Peptides provides Follistatin 344 at high purity with comprehensive third-party analytical verification. Their quality control process ensures batch-to-batch consistency, and each order ships with full documentation.

• High purity verified by third-party testing
• Batch-specific COAs with SDS-PAGE and HPLC data
• US-based fulfillment with 2-3 day shipping
• Proper lyophilization and cold-chain handling

Ascension Peptides is our top recommendation for researchers sourcing Follistatin in 2026.

Follistatin vendor evaluation requires attention to protein-specific quality markers:

• Purity ≥95% — As a larger recombinant protein, purities above 95% indicate excellent production quality
• SDS-PAGE verification — Should show a single band at the expected molecular weight (~35-40 kDa for FS-344)
• Bioactivity data — Premium vendors provide activin-binding or myostatin-inhibition assay results
• Endotoxin levels — Must be low (<1 EU/μg) for cell culture and in-vivo research
• Expression system disclosure — Vendor should specify whether produced in E. coli, CHO cells, or other systems, as this affects glycosylation
• Proper cold-chain shipping — Follistatin is sensitive to temperature. Ensure vendor ships on dry ice or cold packs

Follistatin pricing is higher than simple peptides due to recombinant production complexity:

• 100μg: $45–$80
• 500μg: $120–$200
• 1mg: $200–$350

Red flags:

• Very low prices — recombinant protein production is expensive. Cheap Follistatin likely means degraded or impure product
• Vendors claiming "peptide" Follistatin — FS-344 is a full protein, not a short peptide
• No SDS-PAGE data or bioactivity confirmation
• Shipping without cold-chain handling — Follistatin degrades at room temperature

Follistatin quality verification requires protein-appropriate analytical methods:

• SDS-PAGE — Confirms molecular weight (~35-40 kDa) and detects degradation products or contaminating proteins
• HPLC/SEC — Size exclusion chromatography confirms monomer purity and detects aggregation
• Mass spectrometry — Confirms intact protein mass
• Bioactivity assay — Activin-binding ELISA or cell-based myostatin inhibition assays confirm functional activity
• Endotoxin (LAL) testing — Essential for any cell-based or in-vivo research applications

Ascension Peptides provides comprehensive analytical data for Follistatin, including purity and identity verification.

Follistatin is a uniquely important research tool for muscle biology, reproductive physiology, and TGF-β signaling studies. Ascension Peptides is our top recommendation for 2026, offering high-purity Follistatin 344 with comprehensive documentation and proper cold-chain shipping.

Store lyophilized Follistatin at -20°C or -80°C. Reconstitute in sterile PBS or the vendor's recommended buffer. Avoid repeated freeze-thaw cycles by preparing single-use aliquots. For research purposes only.