What we found
As of October 13, 2026, the cheapest price per milligram we track came from a High confidence vendor for 20 of 37 compounds. In the other 17, a cheaper listing existed elsewhere, and the High confidence low sat a median of about 17% above it.
That's the whole finding, and it's a reassuring one. More often than not, choosing the store with the stronger label costs you nothing, because it's often the store with the lowest price.
How we counted
We took every in-stock, single-vial listing we saw between October 7 and 13, 2026 from the vendors we publish, most of whom we rate High confidence. We left out multi-vial packs, blends and raw powder, because a ten-vial pack priced per milligram isn't the vial you're actually comparing. We also left out a handful of listings priced so far below everyone else that they looked like a size or unit mistake, and sent them to our database lead to check rather than publish them.
Then, for each compound with a real field of sellers (we set the bar at five vendors), we compared two numbers, the lowest price per milligram overall and the lowest from a High confidence vendor. If they matched, the High confidence store was already the cheapest (or tied for it). How we vet vendors explains what the label means. The formula behind it stays private.
Where the gap showed up
When there was a gap, it ran from about 3% to about 42%. Six were under 10%. Two compounds had gaps of 30% or more, 5-Amino-1MQ and Melanotan I, which is where the choice between the cheapest price and the strongest label is a real one.
One more detail stood out. Every one of those 17 cheaper listings came from the same single store, one we don't currently rate High confidence. So the gap isn't a market-wide pattern so much as one vendor pricing low across a lot of its catalog. That isn't a mark against it. A lower label usually means we have less evidence, not bad evidence.
What this means when you shop
On most peptide pages, the two lowest prices we show side by side will be the same number, and you can stop there. When they differ, the gap tells you what the extra evidence costs, and you get to decide if it's worth it. A few percent is easy. A gap of 30% or more, like the two above, is a fair thing to think twice about.
Either way, compare per milligram, not per vial. A cheap vial that holds less can cost more where it counts. The price comparison tool does that math for you, and the vendor directory shows each store's label.
What this data can't tell you
It's a snapshot of one week, not a month of movement, and prices change daily. We count listed prices before coupons, so a code can close or widen a gap. A confidence label is about the vendor's track record and lab reports overall, not a promise about any single vial. And a compound sold by fewer than five vendors isn't in this count at all.
We'll run the same check every month with the same rules, so next month's number will be directly comparable.