Quality & Testing Standards
Every batch of every product is independently tested by third-party laboratories. We don't expect you to take our word for it — we provide the full Certificate of Analysis with every purchase.
⚠️ FOR RESEARCH USE ONLY — All products are intended for laboratory research purposes. Not for human consumption. Not FDA-approved.
HPLC Purity Testing
High-Performance Liquid Chromatography (HPLC) is the gold standard for peptide purity analysis. Our independent labs use HPLC to separate and quantify all components in a sample, giving us an exact purity percentage.
What it measures
HPLC separates the peptide from impurities, truncated sequences, deletion products, and residual solvents. The resulting chromatogram shows exactly what percentage of the sample is the target peptide versus everything else.
Our standard
- Minimum 98% purity required for every product
- Most products test at 99%+ purity
- Full chromatogram included in the COA
- Impurity peaks identified and quantified
Mass Spectrometry Confirmation
Mass spectrometry (MS) confirms the molecular identity of the peptide by measuring its exact molecular weight. This ensures you're getting the correct compound — not a similar-looking but wrong peptide.
What it measures
MS ionizes the sample and measures the mass-to-charge ratio of the resulting ions. The observed molecular weight is compared to the theoretical weight of the target peptide. A match confirms identity.
Why it matters
- Confirms the peptide is exactly what the label says
- Detects sequence errors, modifications, or degradation products
- Provides molecular weight data to ±0.01% accuracy
- Required for research-grade quality assurance
Endotoxin Testing
Endotoxins are lipopolysaccharides from gram-negative bacteria that can cause inflammatory responses in research models. Even trace amounts can confound experimental results.
What it measures
The Limulus Amebocyte Lysate (LAL) test detects bacterial endotoxins at levels as low as 0.01 EU/mL. This ensures the peptide sample is free from biologically significant endotoxin contamination.
Our standard
- All injectable-grade peptides: below 0.5 EU/mg
- LAL method with kinetic chromogenic endpoint
- Results documented in the COA
Sterility Testing
Sterility testing confirms the absence of viable microorganisms (bacteria, fungi, yeasts) in the product. This is essential for any compound used in cell culture, animal research, or laboratory applications.
What it measures
Direct inoculation and membrane filtration methods are used to test for microbial contamination under USP <71> guidelines. Samples are incubated and monitored for growth over 14 days.
Our standard
- USP <71> compliant sterility testing
- Pass/Fail result documented in COA
- Both aerobic and anaerobic organisms screened
Heavy Metals Screening
Heavy metal contamination (lead, arsenic, mercury, cadmium) can interfere with research outcomes and pose safety risks. We screen every batch against ICH Q3D limits.
What it measures
Inductively Coupled Plasma Mass Spectrometry (ICP-MS) detects trace heavy metals at parts-per-billion levels. Results are compared against International Council for Harmonisation (ICH) Q3D permissible exposure limits.
Our standard
- All products screened below ICH Q3D limits
- Tests for Pb, As, Hg, Cd, and other elements
- Results documented in the COA
How to Read a Certificate of Analysis
Every purchase includes a full COA. Here's what to look for:
- Product Information — Verify the peptide name, sequence, and lot number match what you ordered.
- HPLC Purity — Look for the purity percentage (should be 98%+). The chromatogram should show a single dominant peak with minimal impurity peaks.
- Mass Spectrometry — Confirm the observed molecular weight matches the theoretical weight of the peptide. This verifies identity.
- Endotoxin Level — Should be below 0.5 EU/mg for injectable-grade peptides. The COA will state the actual measured value.
- Sterility Result — Should read "Pass" or "Sterile." Any "Fail" result means the batch should not be used.
- Heavy Metals — Each element (Pb, As, Hg, Cd) should be below ICH Q3D limits. The COA lists actual measured values.
- Testing Laboratory — Should be an independent third-party lab, not the manufacturer. This ensures unbiased results.
- Test Date & Signatures — Verify the test was performed recently and the document is signed by the analyzing scientist.
Quality You Can Verify
Browse our full catalog of independently tested research peptides. Every product page shows full specifications and testing data.
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