For Research Use Only. Not for human or veterinary consumption, diagnostic, or therapeutic use. Sold exclusively to qualified research professionals.Not for human consumption.
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Follistatin-344 is a 344-amino-acid glycoprotein used in in vitro research on myostatin and activin neutralization, TGF-β superfamily signaling, and skeletal muscle cell models.
- Purity: ≥99% by HPLC
- Molecular weight: ~38 kDa
- Form: Lyophilized powder
- Storage: -20°C, protect from light
- Third-party verified COA included with every batch
For research use only. Not for human or veterinary use.
- Free standard shipping on orders over $200
- Express shipping available at checkout
- All sales are final — no returns or exchanges, as these are research-use peptides
- Orders ship in discreet, tracked packaging
- Store sealed lyophilized vials at -20°C, protected from light and moisture
- Short-term storage (up to 30 days) acceptable at 2–8°C in original packaging
- Allow vials to reach room temperature before opening to prevent condensation
- Reconstitute with bacteriostatic water; gently swirl — do not shake or vortex
- After reconstitution, store at 2–8°C and use within 30 days
- Avoid repeated freeze-thaw cycles; aliquot if longer-term storage is needed
- For research use only — handle according to standard laboratory safety practices
Follistatin-344
Clinically formulatedQuality assuredPremium gradeTrusted by patients
HPLC Verified
99.62%
Independent purity assay
Tested
Technical Specifications
Reference data for laboratory use
Appearance
White lyophilized powder
Molecular Formula
Glycoprotein
Molecular Weight
~38 kDa
CAS Number
80449-31-6
Purity (HPLC)
≥99%
Receptor / Target
Myostatin/activin binding
Storage
-20°C lyophilized
Reconstitution
BAC water
HPLC Analysis
Reverse-phase HPLC with UV detection at 214 nm. Single dominant peak confirms ≥99% purity. Retention time: 7.30 min.
Reconstitution Calculator
Interactive dilution and dosing reference
Build your protocol
0.25 mg10 mg
Protocol Results
Concentration5.00 mg/mL
Per 0.1 mL0.50 mg
Draw for dose50 units
Doses per vial4
Units shown for U-100 insulin syringe (1 mL = 100 units).
Diluent
Bacteriostatic water (0.9% benzyl alcohol) recommended. Sterile water acceptable for short-term studies.
Storage
Lyophilized: −20°C up to 24 months. Reconstituted: 2–8°C, protected from light.
Stability Window
Reconstituted material stable up to 28 days refrigerated. Avoid freeze-thaw cycles.
Calculator provided for reference only. For laboratory research use — not intended for human administration.
Follistatin-344 vs PEG-MGF
Head-to-head reference comparison at the receptor and molecular level.
PropertyOur Follistatin-344PEG-MGF
Receptor / TargetMyostatin/activin bindingIGF-1R (E-domain variant)
Molecular Weight~38 kDa~7 kDa
CAS Number80449-31-6N/A (analog)
Reported Half-Life~hours~hours
Purity Grade≥99%≥99%
Research UseMyostatin inhibition researchSatellite cell activation research
Why Researchers Choose Us
How we compare to typical peptide suppliers
FeatureOur LabSupplier ASupplier B
Verified purity (HPLC)
≥ 99.0%
Verified Researcher Reviews
From qualified research professionals — institutional affiliation verified
4.9(412 verified)
Verified Buyer
"Consistent purity across three separate batches. COA matched our in-house HPLC results within 0.3%. Lyophilization quality is excellent — clean reconstitution every time."
Dr. M. Chen
University Research Lab · Academic
Purity verified: 99.6%
Method: HPLC in-house verification
Frequently Asked Questions
Everything researchers ask before ordering peptides.
Made in USA
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3rd-Party Tested
Janoshik Analytical
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Trusted since 2021
92% Reorder Rate
Within 60 days
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If your order arrives damaged or doesn't match its COA, we'll make it right.
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Every batch is verified for purity and potency before it reaches you.