Understand the source comparison
TB-4 Real vs Fake: Vendor Comparison
Third-Party COA Availability Provided pre-purchase with named lab, batch number, contact info Generic PDF with no lab name, or 'available upon request' only after payment COA accessibility before purchase is the single strongest authenticity signal. Legitimate
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Third-Party COA Availability
- Provided pre-purchase with named lab, batch number, contact info
- Generic PDF with no lab name, or 'available upon request' only after payment
- COA accessibility before purchase is the single strongest authenticity signal. Legitimate suppliers have nothing to hide
- HPLC Purity Documentation
- ≥98% purity with visible chromatogram showing single dominant peak
- Claims '99% pure' with no supporting chromatography, or outdated test results recycled across batches
- Purity claims without chromatogram data are marketing, not verification
- Mass Spectrometry Confirmation
- Molecular weight within ±5 Da of expected 4,963 Da for TB-4
- No mass spec data provided, or results showing significant variance
- Mass spec is how you confirm amino acid sequence accuracy. Without it, you're trusting the label
- Sterility and Endotoxin Testing
- LAL assay results showing <1.0 EU/mg endotoxin level
- No sterility documentation, or claims of 'sterile compounding' without lab verification
- Endotoxin contamination is invisible. It invalidates immunological research protocols entirely
- Reconstitution Behavior
- Dissolves in 60–90 seconds, produces completely clear solution
- Requires extended mixing, leaves particulates, or produces cloudy solution post-reconstitution
- Visual clarity post-reconstitution detects degradation and contamination but does NOT confirm potency
- Cold-Chain Shipping
- Arrives cold with insulated packaging, gel packs, temperature monitoring where applicable
- Ships ambient temperature in standard envelope or padded mailer
- Temperature excursions denature peptides irreversibly. Ambient shipping is an automatic disqualifier
- Vendor Transparency
- Responsive to COA requests within 24 hours, provides direct lab contact info
- Delays COA requests beyond 48 hours, refuses pre-purchase documentation
- Response time reveals whether documentation exists or is being fabricated on demand