Buying research peptides online comes down to one question: can the supplier prove what is in the vial? Everything else — price, packaging, shipping speed — is secondary to documented identity and purity. This checklist covers what to verify before ordering from any peptide vendor.
1. Is a Certificate of Analysis published, not promised?
A Certificate of Analysis (COA) is the lab report for a specific batch. The difference between a serious supplier and a reseller is whether the COA is published on the product page or only offered "on request". Requesting a COA by email lets a vendor send a document from any batch, or a document that is years old. A COA visible before purchase can be checked against the vial you receive.
Every HolyPeps product page shows the batch documentation for the material being sold. See how to read a peptide COA for what the individual sections mean.
2. Does the COA come from a third-party lab?
An in-house purity number is a self-assessment. Third-party testing means an independent laboratory ran the analysis and has no commercial interest in the result. Look for the testing laboratory's name on the document, the analysis date, and the batch or lot identifier. If any of those three are missing, the document is not verifiable.
3. Which analytical methods were used?
Two methods should appear on a complete report:
- HPLC (high-performance liquid chromatography) — measures purity as a percentage of total peak area.
- MS (mass spectrometry) — confirms identity by measuring molecular mass against the expected value.
HPLC without MS tells you the material is pure, but not that it is the right compound. MS without HPLC tells you the compound is correct, but not how much else is in the vial. Both are needed. Purity testing is explained in more detail here.
4. Is the material lyophilized and correctly packaged?
Research peptides are supplied as a lyophilized (freeze-dried) powder in a sealed vial, not pre-mixed in solution. Peptides in solution degrade far faster than dry powder. A vendor shipping pre-reconstituted peptide is either mislabelling the product or has not considered stability. See why research peptides ship as powder.
5. Is the labelling accurate about what is being sold?
Compounds sold for laboratory research are labelled for research use only. Any vendor describing a research compound in terms of personal outcomes, dosing schedules, or health results is either not operating as a research supplier or is not being careful with regulatory language. That carelessness tends to extend to their documentation.
6. Are storage and shipping conditions stated?
Lyophilized peptides are stable at room temperature for short transit periods but should be stored cold on arrival. A supplier should tell you the recommended storage condition for the material, not leave it to you to guess. Storage and stability are covered here.
7. Is there a real returns and support path?
Check for a published refund policy, a working support channel, and a stated shipping carrier and timeframe. HolyPeps ships worldwide via DHL, with free shipping on orders over $150.
Quick vetting checklist
| Check | Pass | Fail |
|---|---|---|
| COA | Published on the product page | "Available on request" |
| Testing | Named third-party laboratory | Unnamed or in-house only |
| Methods | HPLC + MS | One method, or none stated |
| Batch | Lot number and analysis date | No identifiers |
| Form | Lyophilized powder, sealed vial | Pre-mixed solution |
| Labelling | Research use only | Personal-use or outcome claims |
| Storage | Conditions stated | Not mentioned |
Where HolyPeps stands
Every compound in the HolyPeps catalog is supplied as lyophilized powder in a sealed vial, third-party tested at 99% or higher purity, with batch documentation shown on the product page. Reconstitution requires bacteriostatic water, which is sold separately.
All products are intended for laboratory and research use only. They are not medicines, are not for human or veterinary use, and are not for diagnostic or therapeutic application.