Why look for a Peptide Sciences alternative?
Peptide Sciences (peptidesciences.com) has been a long-standing research-peptide vendor. Buyers often look for alternatives when they want vendors with publicly-verifiable Certificate of Analysis quality — lot-specific COAs from named third-party labs with the full panel of identity, purity, endotoxin, microbial, heavy metals, and net peptide content tests. The Disclosed Labs index scores every vendor on these dimensions so you can pick on data rather than reputation.
What should a Peptide Sciences alternative offer?
The bar a serious research-peptide vendor should meet in 2026: published lot-specific Certificates of Analysis from a named third-party lab (not just an in-house purity number), all five safety panels reported per batch (identity by mass-spec/FTIR or HPLC retention-time match, endotoxin via USP <85>, microbial safety via USP <61>/<71>, heavy metals by ICP-MS, and net peptide content in mg per vial), and lab-confirmed authorship visible on the COA. Vendors who meet that bar score in the A or B grade range on the Disclosed Labs trust index.
How does Disclosed Labs rank peptide vendors?
Every vendor we track is scored on four dimensions weighted to total 100: 30% average HPLC purity across their published COAs, 40% safety panel coverage (the five panels above, aggregated per peptide), 15% lab corroboration (whether the issuing lab has confirmed authorship — mirror upload, verification badge, etc.), and 15% forgery signals (lot-number collisions across vendors, suspiciously narrow lab variance, claim-not-tested mismatches). Composite maps to A (90+), B (80–89), C (70–79), D (60–69), F (below 60).
Why are most peptide vendors F-grade?
Most vendor COAs report HPLC purity but omit endotoxin, microbial, heavy metals, and net peptide content — about 80% of what matters for actual sample safety. Lab corroboration is rare because most vendors source from upstream Chinese contract synthesis houses and white-label the COA without engaging the lab for confirmation. And forgery signals (recycled lot numbers across multiple unrelated vendors, identical narrow purity distributions across years) are common across the vendor population. A vendor at C or below typically fails on safety panel coverage; a vendor at F typically fails on multiple dimensions plus has active forgery flags.
Where do I check live vendor prices?
Live cross-vendor pricing for every indexed peptide is at /prices. The page shows current price-per-vial and price-per-mg for each vendor selling a given peptide, sorted by total cost or trust grade. Active promotional codes from A and B grade vendors are listed at /deals — vendor-posted, free placement, gated to verified-honest vendors only.
How do I verify a specific Certificate of Analysis?
Type the lot number from any COA into the Lot Lookup at /lot. The page returns every Certificate of Analysis across every indexed vendor that references that lot — used to detect cross-vendor lot collisions (a strong fraud signal). The system tolerates common OCR transcription drift (O ↔ 0, I ↔ 1, S ↔ 5) so you can type the lot exactly as it appears on the vial label.
Disclosed Labs