A certificate of analysis (COA) is the lab report for a specific lot. The essentials: the purity percentage (how much of the sample is the target compound), the content in mg (measured amount versus what the certificate states), the identity confirmation, the testing methods, the lot number, and the test date.

Cross-check the batch ID on the certificate against your order confirmation for the same product and size. Every Halaltide COA is published — you can look it up here.

Lyophilized (freeze-dried) peptides are relatively stable at room temperature for short periods, which is why they ship without refrigerated packaging. For long-term storage, keep lyophilized material at −20 °C, protected from light. Once reconstituted, refrigerate at 2–8 °C and use within about 30 days.

Domestic shipping times are short enough that freeze-dried powder remains stable in transit. After your order arrives, follow the storage guidance on each product page — see Shipping.

HPLC (high-performance liquid chromatography) separates the components of a sample and quantifies them, which is how purity percentage is determined. Mass spectrometry measures molecular weight, confirming that the compound is what it claims to be.

Used together, they answer two questions: is this the right molecule, and how pure is it? Testides and Peptide Test Canada run both on every lot we ship.

Purity tells you what fraction of the material is the target compound. Content tells you how many milligrams the tested sample contained versus the stated amount. Material can be highly pure but underfilled — a good certificate reports both.

Our certificates show measured content in mg alongside purity, so you know what the tested batch contained.