The single most important signal is a Certificate of Analysis tied to a batch number, dated, from a named lab. See how to verify peptide quality. A generic, reused COA tells you little.
Independent labs beat in-house testing. US-based, US-tested vendors add traceability and faster shipping.
Sticker price misleads. Compare cost-per-milligram after discount codes — which is exactly what PepsTracker does across all 26 vendors. Be wary of prices far below market.
Clear domain, contact, return/shipping policies, and a consistent catalog are good signs. The PepsTracker vendor directory lists each vendor's profile, discount code and COA status.
| Check | Why |
|---|---|
| Batch COA from a named lab | Verifies purity & identity of that batch |
| Third-party / US testing | Removes conflict of interest; traceability |
| Competitive $/mg after code | True value, not sticker price |
| Transparent policies | Signals a real, accountable business |
Prioritize batch-specific COAs from independent (ideally US) labs, compare real cost-per-milligram after discount codes, and favor vendors with transparent policies and a consistent catalog. PepsTracker's directory flags COA-tested vendors.
Not necessarily. A suspiciously low cost-per-milligram can indicate underfilled or impure vials. The best choice is the cheapest option that also meets your quality bar (batch COAs, third-party testing).
PepsTracker compares all 26 vendors on cost-per-milligram with discount codes applied and flags COA-tested vendors, so you can weigh price and quality together.