Show the arithmetic.

The one figure that orders every ledger on this site is price per milligram:

$/mg = listed vial price ÷ stated peptide content in mg

Both inputs come from the vendor’s own product page. The listed price is the single-unit price shown to a logged-out visitor in US dollars, before shipping, before tax, and before any discount code. The stated peptide content is the milligram figure the vendor publishes for that vial — not a figure we estimate, and not one we infer.

Figures are rounded to two decimals for display, but ordering runs on the unrounded value. Two rows that display the same $/mg may therefore still be ranked, and the one shown higher is genuinely lower. Each row carries its own figure so the size of the gap between vendors is visible, not just the sequence.

The consequence is worth stating plainly: the cheapest row is not always the cheapest order. A vendor two rows down with free shipping over $100 can beat the top row on a real basket. The $/mg figure is the baseline that makes vials comparable; the shipping and code fields finish the math for your specific order.

A listing earns a row when the vendor publishes a price, a stated peptide content, and a product page we can link to. Listings that omit the milligram content cannot be normalised and are not indexed. Listings that are out of stock at check time keep their last observed price and are marked, rather than silently dropped.

Lyophilized vials and nasal sprays are different products at different concentrations in different delivery formats. Dividing a spray’s price by its total peptide content produces a number that looks comparable to a vial’s and is not. So sprays sit after the vials on every compound page, outside the ranking, carrying their own figure for spray-to-spray comparison only.

Blends are indexed on their total stated peptide content across all components, because that is what vendors publish. A blend’s $/mg is therefore not comparable to any single-compound $/mg, and the low figures blends tend to show are an artefact of that rather than a bargain. Compare blends to blends.

Laboratory consumables — bacteriostatic water and similar — are indexed per 10 mL rather than per milligram, and are shelved separately for that reason.

Two flags can appear on a ledger. Both are computed from the data on the page. Neither is for sale, and neither is assigned by hand.

Where a vendor publishes a certificate of analysis, we link the document itself so you can read it rather than take our word for it. Many are mirrored on this site so the link does not rot when a vendor reorganises their storefront; the mirrored copy is the vendor’s document, unaltered.

Three things matter when you assess one. Whether an independent laboratory is named — an unattributed document is close to unverifiable. Whether the batch or lot number matches the label on the vial being sold — a COA for a different lot describes different material. And whether it is recent enough to plausibly cover current stock.

What a COA cannot establish is that the vial you receive is the material the document describes. We do not audit issuing laboratories, do not verify chain of custody, and do not independently test any product. The flag rewards documentation, and documentation only.

Listings are re-checked on a schedule and each row carries the date it was last verified. The date in a compound page’s header is the most recent check for that page. When a substantive field changes — price, vial size, COA, shipping origin — the date advances with it.

Between checks, figures drift. Vendors change prices without notice and we claim no real-time accuracy. The vendor’s checkout page is authoritative on price and availability; this site is a comparison index, not a live feed.

The chemistry, mechanism, and study-framework sections on compound pages are drawn from peer-reviewed primary literature and public chemical databases, cited inline with links to the source. Where we describe a study we describe its framework — design, model, participant count, duration, citation — not its outcomes.

Molecular formulas, masses, sequences and database identifiers come from public registries. Receptor and pathway descriptions are qualitative statements about what the cited in-vitro work reports, not efficacy claims.

We publish no dosing, administration routes, protocols, or human-use guidance for any compound. All of it is research-use-only material about laboratory compounds.

Every figure here is meant to be reproducible from the vendor’s listing and the rules above. If you divide the price by the milligrams and get something other than what we show, one of us is wrong and we would like to know which.

Report it through the contact page with the page URL, the field, and the vendor listing you are comparing against. Confirmed errors are corrected and the page’s checked date is updated.