Lab Results

What we test, on every batch

• HPLC purity (high-performance liquid chromatography). Quantifies what fraction of the lyophilized powder is the target peptide vs. truncations, byproducts, and other impurities. Reported as area-under-the-curve at the relevant detection wavelength. Our release threshold is ≥98%; most lots run higher.
• Mass spectrometry identity confirmation. Verifies that the observed molecular weight of the peptide matches the theoretical mass within instrument tolerance. This is what distinguishes "the right molecule at high purity" from "the wrong molecule at high purity" — without it, an HPLC number alone is meaningless.
• Lot tracking. Every CoA is tied to a specific manufacturing lot number, which is printed on the vial label. The CoA you see on a product page corresponds to the most recent lot we're currently shipping; the lot number on your vial will match that document.

How to find the CoA for your order

1. Open the product page for the item you ordered (linked from your order confirmation).
2. Look for the "Lab Results" or "CoA" tab near the product description.
3. Confirm the lot number on the CoA matches the lot number printed on your vial.

If the lot on your vial doesn't match the CoA currently posted (we may have rolled to a new batch since your order shipped), email hello@peptidesgetonline.com with your order number and the lot from your vial — we'll send you the matching CoA the same business day.

What "≥98% purity" does and doesn't mean

A high HPLC purity figure indicates that the target peptide is the dominant component of the lyophilized material by chromatographic area. It does not, by itself, certify sterility, endotoxin level, residual solvent content, or fitness for any specific use beyond research. Research-grade peptides are explicitly distinct from pharmaceutical-grade material, which requires additional regulated procedures (USP/EP monographs, microbial limits, GMP audit trails) that are out of scope for our CoAs.

For research workflows, the HPLC-purity-plus-MS-identity combination is the standard quality signal — it tells you what's in the vial and how clean it is, which is what determines whether your assay results are interpretable.

Independent third-party testing

We use independent third-party laboratories for all release testing — not in-house assays. The CoAs you see on product pages are issued by those external labs, with their methodology summary, instrument run conditions, and signed analyst attribution. We do not edit, recompose, or summarize the lab's output; the CoA is the unmodified report.