Quality & Testing Standards
Every product is independently tested and verified before it reaches your lab.
Our Testing Process
Every batch undergoes two independent analytical methods to verify both purity and identity.
HPLC Analysis (Purity)
High-Performance Liquid Chromatography separates the sample into its individual components. This reveals the exact percentage of the target compound versus any impurities — giving you a precise purity reading.
Mass Spectrometry (Identity)
Mass spectrometry measures the molecular weight of the compound, confirming that the peptide is exactly what it claims to be. This serves as an independent identity verification alongside the purity test.
What >99% Purity Means
>99% of the sample is the target compound
Verified by independent HPLC analysis on every batch
A purity level above 99% means that more than 99 out of every 100 parts of the sample are the intended peptide. The remaining fraction — less than 1% — consists of trace amounts of salts, residual solvents, or synthesis byproducts that are standard in peptide manufacturing.
Many research peptide suppliers offer products at 95–98% purity. Our >99% standard provides a higher level of consistency and reliability for research applications.
Certificate of Analysis (COA)
Every batch we sell has an associated Certificate of Analysis — a document issued after laboratory testing that reports:
- Purity percentage (via HPLC)
- Identity confirmation (via mass spectrometry)
- Batch/lot number
- Date of analysis
Request a COA
Email support@terrapeptides.com with the product name and your order number, and we'll send the corresponding Certificate of Analysis.
Sourcing & Supply Chain
We work with established peptide manufacturers that meet strict quality criteria including cGMP-aligned synthesis processes, in-house analytical testing, and consistent batch-to-batch reproducibility. Every supplier is evaluated on purity standards, testing documentation, and reliability before we carry their products.
Storage & Handling
Quality doesn't end at the vial. Proper storage is essential for maintaining peptide stability and purity. Each product page includes compound-specific storage recommendations. For general guidance, peptides should be stored in a cool, dry environment away from direct light. See individual product pages for detailed storage instructions.
Research Use Only
All products sold by Terra Peptides are intended strictly for laboratory and research purposes. They are not intended for human or veterinary use, food additives, drugs, cosmetics, or any other inappropriate applications. By purchasing, you confirm that you understand and agree to these terms.