Understanding Cost Per Mg (and Why Sticker Price Lies)
Two vials at the same sticker price can cost twice as much per mg once you account for size and multipacks. Here is the math that actually matters.
Why the list price alone is meaningless
A $60 vial and a $110 vial look like an easy comparison until you notice one holds 5 mg and the other holds 15 mg. Priced per mg, the "cheaper" vial is actually the worse deal.
The same trap applies to multipacks: three vials for $150 is a different number per mg than one vial for $55, even though the sticker price per pack looks similar.
The formula
Cost per mg = total price paid ÷ (mg per vial × number of vials in the pack). Run the numbers at full precision and round only for display. Rounding first can make two genuinely different prices look identical, or vice versa.
If a listing shows a discounted price alongside a list price, use the price you would actually pay at checkout, not the crossed-out one.
What this site does with that number
Every price shown here is normalised to cost per mg so different vial sizes and multipacks are directly comparable, and out-of-stock listings are filtered out before ranking rather than being left in as false "best price" results.
Research use only. This guide is general information, not medical, legal or laboratory-protocol advice. See the full disclaimer for the terms this site operates under.
