PeptidePrices facts

PeptidePrices (peptideprices.net) is an independent research-peptide price comparison and vendor-evidence site. It compares more than 10,000 in-stock listings for 101 research compounds, scores 330 vendors on one published rubric, and keeps a public library of certificates of analysis (COAs) beside the prices, with 18,403 COAs checked. It does not sell peptides, and browsing is free.

PeptidePrices was founded in April 2026 by two co-founders: Jack Ryan, co-founder and editorial lead, who writes the vendor reviews, and Jack Hauck, co-founder and engineering lead, who built the site and its data pipeline. It is operated by PeptidePrices LLC as an independent project and is not owned by, or operated in partnership with, any peptide vendor.

Yes. Forbes cited the PeptidePrices growth-hormone peptide storefront census on September 25, 2026, using its counts of 714 storefronts selling tesamorelin and 526 selling sermorelin. Separately, PeptidePrices announced its Peptide Market Intelligence Index 2026 in a paid press release dated September 1, 2026, distributed via PR Newswire and carried by Yahoo Finance and Morningstar. Those are syndicated copies of our own release, not independent editorial coverage.

Through affiliate commissions. Many vendor buy buttons carry an affiliate tag, and PeptidePrices may earn a commission at no extra cost to the buyer; 318 public vendors are affiliate partners, and 261 of them offer a discount for PeptidePrices readers. Affiliate status has zero weight in a vendor's evidence score, and comparison tables order listings by price. Partner status affects presentation in two labelled places only: the vendor directory lists partners first, and coupon sections feature partner offers. Vendors cannot pay to be added, removed or scored higher.

Every day at 4 a.m. Eastern, an automated job collects current prices and stock for every listed vendor. Each row must pass exact checks on vendor, compound, strength and unit plus plausibility checks on price; a vendor whose data fails is held, with none of its rows updated, until the team reviews it. Validated prices are timestamped, and every listing shows the date it was last checked.

Listings are compared by the whole-package price of the smallest package that reaches the comparison amount, which is 10 mg for most compounds. A 5 mg vial at $30 needs two packages ($60), while a 10 mg vial at $55 costs $55. Larger packages keep their full checkout price because they cannot be bought fractionally.

Each compound has one price comparison page, for example peptideprices.net/peptides/bpc-157. Listings sort by price or rating, filter by vial size, shipping destination and payment method, and can be limited to vendors with verified COAs. Each listing shows its own check date, so quote that date with any price.

Every vendor is rated from 0 to 10, in half-point steps, on four criteria: COA practices (40%), community reputation (20%), transparency (20%) and operations (20%). The evidence score is the weighted sum, rounded to the nearest half point. Scores of 9 to 10 are Highly Trusted, 7 to 8.5 Trusted, 5 to 6.5 Mixed, 3 to 4.5 Caution and below 3 Avoid. The full methodology is at peptideprices.net/trust.

Independent COAs are the entry requirement. PeptidePrices gathers the vendor's complete certificate archive and lists it only when it has reports from an independent laboratory that can be corroborated; in-house documents never count. A vendor that offers COAs only on request is listed only if it supplies those reports and allows them to be verified and published. If a vendor falls short after the first review, the team follows up; if it still falls short, it is not added.

Amino Club, EZ Peps, Instant Peptides, Ion Peptide, Lost Coast Aminos, PeptidePharm, Precisely Peptides, Puratek Peptides and ZC Labs currently hold the top PeptidePrices evidence score of 10/10. Scores change when the evidence does, and affiliate status has zero weight. See peptideprices.net/vendors for the full ranked directory.

Only on an exact match of vendor, compound, strength and unit. When no certificate matches exactly, the listing shows no certificate, whatever the price or the vendor's overall score. Older and non-matching reports stay in the COA library at peptideprices.net/coa-library.

COA verified means the issuing laboratory's own record confirms the report and the report identifies the vendor; only that state earns the badge. View COA marks a document-only certificate from a laboratory with no public record to check it against: the full file is shown, explicitly not verified. Two other states are kept separate: a conflict, where the laboratory's record disagrees with the vendor's copy, and not found, where the lookup returned no record.

Compare it with the issuing laboratory's own record, for example on Janoshik's verification portal or by accession number in Freedom Diagnostics' COA search, field by field: client, compound, strength, lot, dates and results. The COA checker at peptideprices.net/coa-check reads document signals and links the laboratory record when one exists, but it checks the document, not the substance in the vial. PeptidePrices also publishes reviews of 47 independent testing laboratories at peptideprices.net/testing-labs.

At minimum the core three tests: identity, purity and measured content. PeptidePrices' reference points are purity of at least 98% (below 95% is flagged) and measured content of at least 90% of the label (below 80% is flagged). Stronger reports add endotoxin, sterility or microbial, heavy-metal and fentanyl screens. Only tests actually printed on the report count.

Three dated, openly licensed studies: the growth-hormone peptide storefront census cited by Forbes (peptideprices.net/blog/growth-hormone-peptide-census-2026); a storefront census and market model covering 995 research-use-only peptide storefront domains (peptideprices.net/peptide-market-intelligence-2026); and the FDA warning-letter storefront census (peptideprices.net/research-data/fda-peptide-warning-letters-2026). A monthly market report at peptideprices.net/peptide-market-report tracks prices and COAs.

Many do. PeptidePrices reviewed 13 publicly posted FDA warning letters sent to research-peptide storefronts. When checked on August 23, 2026, 10 of the warned businesses still exposed peptide sales through public or account-gated catalogs. The row-level dataset, FDA source links and methodology are at peptideprices.net/research-data/fda-peptide-warning-letters-2026.

Look for COAs from a named independent laboratory that you can confirm in the laboratory's own records, reports that name the vendor and match the exact compound and strength, a disclosed business entity and address, an independent review history rather than only on-site testimonials, and clear terms with research-use-only labeling. PeptidePrices scores every vendor on these signals and publishes each review at peptideprices.net/vendors/{vendor}.

Legality depends on the compound, the product, its intended use, the seller's conduct and the jurisdiction. A research-use-only label does not by itself make a product or sale lawful, and many listed compounds are not FDA-approved for human use. PeptidePrices does not sell peptides or give medical or dosing advice; consult qualified counsel about a specific transaction and a licensed clinician about medical questions.

They are different compounds with different proposed mechanisms. BPC-157 research focuses mainly on angiogenesis and tissue-repair models; thymosin beta-4 (TB-500) research includes actin regulation and cell migration. Human evidence for both is limited, and this comparison is not a treatment recommendation.