Peptide suppliers, ranked by lab tests and reviews — page 4.

Where to buy peptides: what to check before you order

Start with a supplier that has recent independent lab tests for the compound you want, and buyer reviews you can read — the ranking above is built from those two things.

The Trust Score captures most of what matters, but informed buyers also check a few things directly on the shop's own site before ordering. These are general buyer-education signals, not Peptigrity scoring inputs — but they correlate strongly with shop reliability.

Lab test history. Does the shop publish lab tests with batch numbers, named testing laboratories, and verifiable analytical data? Generic CoAs without batch correlation are decorative, not informative. The shop pages on Peptigrity show how many independent lab tests are on file.

Batch and lot transparency. Legitimate shops photograph their actual vials with visible batch and lot numbers. Stock product photos pulled from supplier catalogs suggest the shop never handles the product directly.

Response to complaints. A shop with a public complaint that's gone unanswered for 30+ days has communicated something. Compare to shops that respond within 48 hours to every issue, even the unfair ones. Peptigrity reviews include sub-ratings for customer service.

Refund and replacement policy. A small percentage of vials leak during transit — this is normal. What's not normal is a shop that refuses to replace leaked product or asks the buyer to "absorb the loss." Check the shop's published policy before ordering.

Shipping transparency. Are shipping timelines published before checkout? Is tracking provided? What's the customs seizure replacement policy? Shops that hide shipping policies until after payment have made a choice — and it's not the buyer's interest.

Price consistency. Pricing that fluctuates 30–50% within a week, especially on high-demand compounds like tirzepatide or retatrutide, suggests the shop is running through inventory of questionable provenance.

Community reputation across platforms. Peptigrity is one signal. Reddit (r/Peptides, r/Tirzepatide), peptide-specific forums, and independent biohacker reviews are other signals. If a shop has a clean record on Peptigrity but a long pattern of complaints on Reddit, that's worth investigating.

The full buyer's checklist →

Frequently asked questions about peptide suppliers

How do I know if a peptide supplier is legit?

Check three things: independent lab tests on file (from third-party labs, never a shop's own lab), community review volume across multiple platforms, and the shop's response to public complaints. A shop with all three signals — independent lab tests, sustained review history, and transparent dispute handling — is significantly more likely to be legitimate than one missing any of these. Peptigrity's Trust Score combines the first two signals automatically.

What's the best peptide company?

There isn't one best for every compound and country. Peptigrity ranks 1,066 suppliers by evidence: independent lab tests and buyer reviews. Today the three highest Trust Scores belong to Rivn Research Peptides, Humatide Peptides and Peptide Partners. Before you order, check that a supplier has recent lab tests for the compound you want and ships to you.

What's the difference between a peptide supplier, a vendor and a shop?

Nothing — the terms are used interchangeably. 'Peptide shop,' 'peptide vendor,' 'peptide supplier,' and 'research peptide company' all describe businesses that sell research-grade peptides. Peptigrity tracks all of them under one directory regardless of how they describe themselves.

What do Reddit and peptide forums say about peptide shops?

Community discussions on Reddit (r/Peptides, r/Tirzepatide, r/Semaglutide) and dedicated peptide forums often surface issues that don't appear on review platforms — slow shipping patterns, lab test discrepancies, customer service breakdowns. Peptigrity hosts its own community discussions and includes community reviews as a 50% weight in every Trust Score.

What are the most common complaints about peptide shops?

The most common complaints across the peptide industry: products shipping later than advertised, vials arriving with visible damage or leakage, purity testing below the shop's published claim, customer service slow or unresponsive to issues, refund or replacement policy not honored after delivery problems. Every Peptigrity review breaks the experience into four sub-ratings (Quality, Delivery, Service, Pricing) so buyers can see where each shop performs well and where it doesn't.

How does Peptigrity check lab test results?

Lab tests come from third-party testing laboratories — in-house testing by a shop's own lab is not accepted. Buyers, researchers and shops can all submit them; a test the shop sent in is labelled shop-provided. Each submitted lab test is reviewed by the Peptigrity team before publication. Peptigrity does not modify purity values or quantity measurements. Low purity results are not hidden, delayed, or deprioritized — an 85% purity test receives the same treatment as a 99% purity test.

Can shops pay to appear higher on Peptigrity?

No. Shops cannot pay for ranking position, score modification, or removal of negative reviews. The Trust Score formula is fixed and applied uniformly across all listed shops. The full policy is documented on the General Rules page.

Are negative reviews removed if a shop complains?

No. Reviews are moderated only for relevance, prohibited content (personal information, threats, hate speech), and duplication. Reviews meeting all moderation criteria are published without editing. Negative reviews are not suppressed, deprioritized, or modified. Shops cannot request removal of legitimate negative reviews.

How often is the peptide shop directory updated?

Trust Scores recalculate automatically when new reviews or lab tests are published, and every night, because only lab tests from the last 2 years count. A single new data point can change a shop's score. New shop additions are reviewed by the Peptigrity team before being added to the directory.