Compound Quality · Testing
Half price is easy. Half price with five lab tests per batch is not. Here is how to tell which one you are buying.
Cheap and tested are not opposites. But when a price drops, testing is the first thing quietly cut. These are the five results a real lab report carries, and what each one rules out.
See the wholesale prices on Pepprzz →
Most listings print one number. Purity. 99%. 98%. Sometimes >99%.
It is a real number and it matters. It is also the cheapest test on the menu, which is exactly why it is the one that always shows up. A seller who runs one test runs that one.
One reported test and five unreported tests look identical from the outside.
Pepprzz runs five tests on every batch. At wholesale prices.
HPLC purity, quantity per vial, heavy metals, endotoxin and bioburden, at an independent ISO 17025-accredited lab. Every vial is 50% off list and nasal sprays are 30% off. No membership, no minimum, no code.
See the lab-tested catalogue →1Purity: how clean is it
HPLC splits the sample into its parts and measures how much of it is the main compound. A purity figure answers one question: of what is in this vial, how much is the thing on the label.
It says nothing about how much is in there. Or what else came along for the ride.
2Quantity: how much is actually in the vial
A percentage is not an amount. A vial can be 99% pure and still hold less than the milligrams on the label.
This is the test that hits your wallet most directly, because it decides what you really paid per milligram. On Pepprzz's BPC-157 10 mg certificate, the three vials tested measured 10.19, 10.46 and 10.56 mg.
Purity is a ratio. Quantity is an amount. You need both.
3Heavy metals: the residue nobody advertises
Arsenic, cadmium, lead and mercury. A purity test is not looking for them, so it will never flag them. ICP-MS is a separate test with a separate bill.
Pepprzz's current batch series reports all four as not detected.
4Endotoxin: the one sterile does not cover
Endotoxins are fragments of bacterial cell wall. They survive the processes that kill the bacteria they came from. So a sample can be clean of living organisms and still carry endotoxin.
It needs its own test. Pepprzz's batch reports show an LAL endotoxin pass at under 5.00 EU/mg.
5Bioburden: is anything growing
The sample is cultured to see whether anything grows. Pepprzz's reports show a pass, no growth.
A test that was never run gives no result. Not a clean one. No result.
Transcribed from the Pepprzz lab reports page, Oct 12, 2026. Issued by Kalbio Biotechnology, Lake Forest, California, an ISO 17025:2017 accredited laboratory, batch series 80426, tested Aug 21, 2026. Open the scan on their site and read it yourself.
See the wholesale prices on Pepprzz →
6The checklist
- Count the tests. One line is one test, however long the PDF.
- Find a quantity in milligrams. Not a percentage.
- Look for heavy metals, endotoxin and bioburden. Three separate lines.
- Check who signed it. An independent accredited lab, not the seller.
- Check it is for your batch. More on that in the next breakdown.
| On the lab report | Pepprzz | Purity-only listing |
|---|---|---|
| Purity by HPLC | Reported | Reported |
| Quantity per vial | Reported | Not shown |
| Heavy metals | Reported | Not shown |
| Endotoxin | Reported | Not shown |
| Bioburden | Reported | Not shown |
| Price | 50% off list | Varies |
Five tests. Half the list price.
Every batch tested before it ships. Every report published. Free 2-day shipping on orders of $250 or more.
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Comments
Never realised quantity was its own test. Assumed purity covered it.
Same. The ratio vs amount line made it click.
The endotoxin point was new to me. Two separate results, makes sense now.
Opened the actual scan on their lab reports page. Matches what is written here.
Rare to see heavy metals reported at this price point. Usually that is the first thing missing.