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Just Peptides
Research chemicals for licensed scientific study only. Please confirm the following before continuing.
Leave SiteJust Peptides
Independent testing, lot-specific certificates, and documentation you can review before you buy. That is the baseline.
99%+
Minimum HPLC purity
100%
Independently tested
0
Self-certified batches
Comparison
Who verifies quality
Typical vendor
Often the manufacturer, or a lab working directly for them.
Just Peptides
An independent accredited lab with no supplier relationship beyond the testing fee.
Certificate scope
Typical vendor
A single document reused across multiple production lots.
Just Peptides
Every batch gets its own COA tied to that specific lot number.
What gets tested
Typical vendor
Claims may rely on supplier-provided numbers or a single assay.
Just Peptides
Purity by HPLC and identity by mass spectrometry. Both must pass before release.
When you can see it
Typical vendor
After checkout, if at all.
Just Peptides
Before you buy. The COA is part of the product page.
Our Process
01
We buy from established manufacturers with a verified production record, not whoever is cheapest this week.
02
Every batch goes to an ISO/IEC 17025-accredited US lab for HPLC purity and mass spectrometry identity testing.
03
If a lot fails purity, identity, or documentation standards it does not ship. No exceptions.
Where to next
Every product page includes the full COA for that batch — purity, identity, and lab documentation — before you commit to anything.
HPLC purity
≥99.4% — our minimum threshold before any batch ships.
Mass spectrometry
Identity confirmed — the compound is what it claims to be.
Lot-specific COA
Tied to your exact batch, not recycled from a prior run.
Independent lab
No financial relationship with our suppliers beyond the testing fee.