HPLC (High-Performance Liquid Chromatography) and LC-MS (Liquid Chromatography-Mass Spectrometry) serve complementary roles in peptide analysis. HPLC measures the purity of a compound by separating its components and calculating the percentage of the target substance. LC-MS goes a step further by providing molecular identity confirmation — it measures the precise molecular mass of the compound to verify it is exactly the peptide it is claimed to be. At Lab Rat Peptides, every batch undergoes both HPLC purity testing and LC-MS identity verification, giving researchers confidence in both the quality and authenticity of their research materials.

Yes. All analytical testing at Lab Rat Peptides is conducted by independent, accredited third-party laboratories — we do not conduct our own in-house testing. We primarily work with Janoshik Analytical and S&N Labs, both of which are recognized testing facilities within the research peptide industry. Independent testing means our results are objective and unbiased, providing researchers with credible documentation they can rely on for their laboratory work. Test reports are linked directly to each product through our COA database.

Upon arrival, lyophilized (freeze-dried) research peptides should be stored at -20°C in a freezer, away from direct light and moisture. In this condition, peptides remain stable for up to 24 months. Do not expose vials to repeated temperature fluctuations. Once a vial has been reconstituted with bacteriostatic water or sterile water for injection, the resulting solution should be stored at 2–8°C (standard refrigerator temperature) and used within 28–30 days. Avoid repeated freeze-thaw cycles of reconstituted solutions as this can degrade structural integrity. All storage recommendations are provided for laboratory research reference only.

A Certificate of Analysis (COA) is an official document issued by an accredited analytical laboratory that confirms the identity, purity, and quality of a specific batch of research compound. Each COA at Lab Rat Peptides is batch-specific, meaning it corresponds to a unique lot of product and cannot be reused across different production runs. The COA documents the HPLC purity result, LC-MS identity confirmation, test date, batch number, and the testing laboratory details. Researchers can access COAs directly through our COA database by searching the batch ID printed on their product label.

The appropriate reconstitution solvent depends on the specific peptide being prepared and the requirements of your research protocol. For most lyophilized research peptides, bacteriostatic water (BW) is commonly used as it contains a small amount of benzyl alcohol that helps preserve the solution. Sterile water for injection (WFI) is also used where bacteriostatic agents are not suitable for the experiment. Some peptides may require acetic acid (0.1%) or DMSO for initial solubilization before dilution. Reconstitution volumes and concentrations must be determined by the principal investigator based on the specific experimental design. This information is provided as a general laboratory reference only and does not constitute usage guidance.

Every product shipped by Lab Rat Peptides carries a unique batch ID printed on the vial label. To verify your product, visit our COA Database at labratpeptides.com/coa-database/ and enter your batch ID in the search field. The corresponding Certificate of Analysis will display the HPLC purity result, LC-MS identity confirmation, test date, and the name of the independent laboratory that conducted the analysis. If you are unable to locate your batch report or have questions about your documentation, contact our support team at support@labratpeptides.com.

Yes. Lab Rat Peptides offers international shipping to eligible destinations where permitted by applicable local regulations. Customers outside the United States are solely responsible for understanding and complying with their country's import regulations regarding research compounds. International orders may be subject to customs inspection, duties, and taxes not included in the order total. Delivery times for international shipments vary depending on destination and local carrier operations. For questions regarding international shipping eligibility for your location, contact our support team before placing your order.