What a PepGrades score measures.

A vendor needs a grade of at least 70 of 100 (B) and the catalog checks below. Vendors under the floor stay in every comparison, labeled, but get no deal checks and are never picked. 47 of 79 vendors pass today.

For each exact product (compound, form, amount and package count), candidates are qualified, in-stock offers among the five lowest qualified listed prices, plus qualified offers with a detected promotion. Only candidates get deal checks; every other offer is shown at its listed price, marked deal not verified.

An automatic deal (no code: buy X get Y, a percentage or an amount off) sets a single-package effective price from one of two sources, labeled on every offer. Cart-checked: we added that product to a fresh, anonymous cart at its current listed price within the last 7 days and read the result. Advertised: where the site's robots.txt keeps us out of its cart, or the cart check has not run, the vendor states the terms on that product's own page, or on a promotion page or banner that covers the whole store, and we read that page within the last 72 hours. A cart check wins when both exist. An advertised deal is not cart-checked and may not apply at checkout, so confirm it in your cart. Terms that need a code, a membership, a sign-in, a first order, a minimum order or a size the page does not name never count. An advertised percentage or amount off counts only when the store shows the product at its regular price, so a discount already in a sale price is never applied twice. Pages behind advertised deals among the five lowest prices are re-read every second night. Bulk deals that need several packages appear only in the bulk view and need a cart check.

Every offer shows what public COAs exist for that exact product. Lab-verified COA: a report for this product and strength retrieved from, or matched at, the laboratory's own portal. Product COA on file: a report for this product, compound and strength; when the report prints a measured amount it must be between 15% below and 35% above the label, because vials are commonly overfilled. COA for another strength: reports exist for the product's compound, but none confirms this strength. Vendor tests other products and No public COA describe the vendor when nothing matches the product. A blend needs reports that name every component. Each report is archived with a SHA-256 fingerprint; we show its test date, laboratory, reference, purity and batch, never the document text.

Up to three of the lowest effective single-package prices among candidates that are in stock, price-checked within 72 hours, and have a product COA (lab-verified or not) whose newest test date is within the last 12 months. Fewer than three is normal. Evidence is a pass/fail floor and price sets the order; there is no blended score, and affiliate relationships never affect picks. Current picks: 292 across 143 products, computed Nov 14, 2026.

A COA describes the batch it names. It does not prove which lot a vendor ships today, and we do not ask vendors to confirm one. Check the batch on what you receive.

The collection found enough usable information to score the component.

We could not reliably measure it. The component is removed from the calculation rather than scored as zero.

A record had an unresolved problem or failed a required rule. It does not contribute to the grade.