The problem with comparing sticker prices
A €30 listing and a €50 listing for the 'same' peptide aren't comparable at all if one vial contains 5mg and the other contains 10mg. The €50 listing is actually cheaper per mg in that case. This is the single most common way price comparisons for research peptides go wrong.
How we normalize it
Every listing on PeptideCompare with a confirmed, single mg size gets a price-per-mg figure, and that's what our sort and 'best value' logic actually uses — not the raw listed price. Listings where the vendor doesn't state a clean single-vial size (marked 'size varies' or similar) are excluded from price-per-mg sorting rather than guessed at, since we'd rather show nothing than a made-up number.
Watch for bundle and blend pricing
Pre-filled pens and blended products (like a combined BPC-157 + TB-500 vial) often list a combined mg figure across multiple compounds — read the size field carefully, since '5mg + 5mg' is not the same comparison basis as a single 10mg vial of one compound.
For research use only. This guide is general background information, not medical or dosing advice.