What a seller needs from a lab
- Identity, usually by mass spectrometry, confirming the compound is what the label says.
- Purity by HPLC, as a percentage.
- Quantity: how much compound is actually in the vial, which is the line that catches underfilled vials.
- Endotoxin testing for some product lines and some buyers.
- A report that names your batch, and a way for buyers to look the report up on the lab's own site.
- Turnaround short enough that batches are not sitting in quarantine for weeks.
The three compared
| Janoshik | Finnrick | Freedom Diagnostics Testing | |
|---|---|---|---|
| What it is | An independent analytical lab, widely used for research peptides | A testing service that routes vials to partner labs and publishes ratings of sellers | An independent lab focused on research-use-only peptides |
| Tests offered | Check the lab's current price list | Identity, purity and quantity; endotoxins on the standard test; other options on the build-your-own test | Purity by HPLC and identity by LC-MS, chosen per sample |
| Published price | Not confirmed (site refused our check) | Standard test $250; build-your-own from $39 | Shown on the submission form, not on the public page |
| Published turnaround | Not confirmed | Standard about 2 weeks; build-your-own from 1 week | Average 1 to 3 business days |
| Public report lookup | Reports are commonly checked on the lab's site; confirm how when ordering | Has a verify-a-COA page | Public lookup by accession number or company name |
Finnrick's free community testing is for individuals only and publishes the findings; its site says sourcing for others belongs on its professional services. As a seller, use its paid options or professional services, not the free tier.
Why Finnrick matters even if you never use it
Finnrick publishes ratings of sellers built from vials that buyers send in. That means your products can be tested and rated without you ordering anything. Seeing it as a threat misses the point: consistent batches, honest labels and quantity that matches the vial are what score well, and they are the same things that keep buyers. Check how your brand appears there from time to time.
How to choose a lab for your batches
- Pick one primary lab and stay with it, so reports are comparable from batch to batch.
- Choose a second lab for spot checks and for any batch whose report looks off.
- Ask before the first sample: which methods, what the report shows, how buyers can look it up, and the real turnaround at your volume.
- Send a blind sample now and then: a vial from stock, not one prepared for testing.
- Put the lab name on every product page and every batch page. An unnamed lab is worth almost nothing to a buyer.
Budget testing into your cost per milligram
Testing is a cost of every batch, not an occasional expense. Divide the cost of a batch's tests by the net milligrams in the batch and add it to your landed cost, so your prices carry it. In the cost per mg calculator, add the batch's testing cost to the duties and fees box. The COA expiry calculator tells you when a batch will need retesting.
Doing it in Purity
Purity reads what it can from the lab's PDF, such as purity, lab, test date and the report key, and marks each filled box for you to check. The batch stays in quarantine until you verify the report against your release rule. You can mark a batch sent to the lab so nothing sits forgotten in quarantine, and every released batch gets a public page with a QR label for buyers. See it on the demo.
Common questions
- How much does peptide testing cost?
- It depends on the lab and the tests. As published in September 2026, Finnrick's standard test was $250 and its build-your-own options started at $39. Freedom Diagnostics Testing shows prices on its submission form. Confirm current prices with the lab before sending samples.
- Which peptide testing lab is fastest?
- Freedom Diagnostics Testing publishes an average of 1 to 3 business days. Finnrick publishes about two weeks for its standard test and from one week for build-your-own. Real turnaround also depends on shipping time to the lab.
- Should I test every batch?
- Yes. A report belongs to a batch, not a product, and buyers match the batch number on the report to the one on their vial.