Reference compounds that hold up to independent verification.
Most reagent suppliers ship whatever the factory says is inside the vial. We test every batch ourselves, domestically, before it reaches your bench — and we publish the data.
Three things we don’t compromise on.
The reagent supply chain has a trust problem — untested compounds relabeled and drop-shipped from overseas with no way to confirm what’s actually in the vial. Here’s how we close that gap.
Independent, domestic testing
We don’t rely on documentation from the original manufacturer. Every batch is sent to a third-party US laboratory before it’s cleared for sale.
Instrument-grade diagnostics
Identity and purity are confirmed with HPLC and mass spectrometry, not a certificate we were handed. A batch that doesn’t clear our purity threshold doesn’t ship.
Data you can actually check
Current Certificates of Analysis are available on request for any batch, so you can verify exact purity and molecular weight yourself.
How that compares to a typical supplier.
| Feature | Onyx Peptides | Typical overseas supplier |
|---|---|---|
| Purity guarantee | ≥99%, HPLC/MS verified | Often unverified, variable |
| Where testing happens | Independent US lab | Factory self-reported |
| Shipping | Domestic, tracked | Slow international drop-ship |
| Documentation | Current COA on request | Outdated or unavailable |
From order to bench, in four steps.
Every order follows the same path, so the testing data you read before you buy is the testing data that ships.
Place your order
Choose a compound and lot; each listing links to its current Certificate of Analysis before you check out.
Batch is pulled from cold storage
Inventory is held lyophilized at sub-zero temperatures until an order calls for it, limiting handling and light exposure.
Packed and shipped domestically
Orders go out from our US facility in insulated, light-blocking packaging with a tracking number sent to your email.
Arrives with its documentation
Your shipment includes batch identifiers matching the COA on file, so you can confirm what arrived against what was tested.
Cold-chain handling, start to finish
Reference compounds degrade under heat, light, and oxidative stress. We lyophilize inventory and hold it in climate-controlled, sub-zero storage from receipt through fulfillment, so what leaves our facility matches what we tested.
Built for lab workflows
Whether you’re running assays, calibrating instruments, or validating a method, reproducible data starts with a reagent you can trust. We keep our published testing data current so the batch you receive matches the report you read.
Shipping details
Orders placed before 2pm ET ship the same business day; later orders go out the next business day.
Insulated, light-blocking shipping boxes with cold packs sized to transit time and season.
A tracking number is emailed as soon as your order leaves the facility, with delivery confirmation on request.
What labs are saying.
“Sample review copy — swap in an actual customer quote about turnaround time, communication, or product quality.”
“Sample review copy — swap in an actual customer quote about the COA or documentation experience.”
“Sample review copy — swap in an actual customer quote about shipping speed or packaging.”
These are placeholder cards, not real reviews. Replace the quotes, names, and rating with genuine customer feedback — ideally linked to a real, verifiable source — before this page goes live. Displaying fabricated reviews or ratings can violate FTC rules and platform terms of service.
Questions we hear often.
Where is testing actually performed?
Every batch is sent to a third-party laboratory in the United States rather than relying on documentation supplied by the original manufacturer.
What happens if a batch doesn’t meet the purity threshold?
It doesn’t get listed for sale. Batches are only released to inventory once HPLC and mass spectrometry results confirm they clear our minimum purity threshold.
Can I get the Certificate of Analysis before I order?
Yes — each listing links to the current COA for its batch, and you can request it directly by emailing info@onyxpeptides.net.
How is stability maintained during shipping?
Compounds are lyophilized and shipped in insulated, light-blocking packaging with cold packs sized to the season and expected transit time.
Do you ship internationally?
Shipping is currently domestic only. Contact us at (323) 387-3752 if you have a specific request outside that scope.
How do I reach support?
Email info@onyxpeptides.net or call (323) 387-3752 — both are monitored during business hours for order and testing questions.