The spread is real
Search three vendors for the same 5 mg vial and the price can range from under $20 to over $45. The spread is not random, and the cheapest option is not automatically the best deal. Here is what drives it, drawn from how the supply chain and testing landscape actually work.
What you're paying for
Synthesis quality and scale. Peptides are made by solid-phase synthesis; yield and purity depend on the process and the scale. Business-to-business manufacturers — CDMOs such as Bachem and PolyPeptide — operate at pharmaceutical scale and price accordingly; the retail vials most buyers see are several steps downstream.
Testing. A vendor that pays an independent lab to test each batch — and publishes the COA — carries a real cost that a vendor shipping untested powder does not. That cost shows up in the price.
Purity and content. As independent labs note, two vials with the same label can differ in net peptide content. A higher price sometimes buys more actual peptide per vial, which makes a raw price comparison misleading. Comparing price per milligram of delivered peptide is closer to apples-to-apples, which is why we show a normalized $/mg figure where the data allows.
Why the cheapest vial is a warning sign
Across community and vendor research, an implausibly low price is one of the most-cited red flags. A vial priced far below the cost of synthesis plus testing implies something was skipped — testing, purity, or honest labeling. The widely referenced anchor is BPC-157 5 mg: legitimate, tested product tends to sit roughly in the $30–45 range, and prices around $10–15 are commonly treated as a signal to be cautious rather than a bargain.
This is not a claim that expensive always means better — paying more guarantees nothing on its own. It means price has to be read alongside testing and provenance, not by itself.
How we present it
We aggregate vendor prices and, where independent test data exists, show it next to the price — attributed to the lab that produced it, never as our own verdict. The comparison is the point; ranking is built from objective signals, and nothing on the page is paid placement.