Supplier review

Purely Peptides review

Purely Peptides (Purely Peptides LLC) is a Phoenix, Arizona research-peptide storefront that publishes a certificate of analysis for every lot it has tested, names the lab, and states plainly what that testing does not cover. It also runs a large free research library and a set of lab calculators. The trade-offs are that only 14 lots are tested so far, and checkout is built around payment methods that are hard to reverse.

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How this review was made

Based on the supplier's public pages and their submission — not on an order

The supplier submitted details to be listed here. We then checked those claims against purelypeptides.org on October 8, 2026 (home page, COA index, a sample lot page, About, Shipping, and the Research Library). We have not placed an order, received product, or independently verified any certificate with the testing laboratory. Where the supplier's submission and its own website disagree, we say so below. See our disclosure for how listings are handled.

Last updated

Reviewed on October 8, 2026

Prices, promotions, and shipping terms change. Re-check the supplier's current pages before ordering.

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Overview Testing and COAs Research library and tools Catalog and pricing Shipping and payment What to watch Questions Verdict

Why it stands out

Per-lot COAs with the limits spelled out

Most supplier pages say "third-party tested" and stop. Purely Peptides publishes each tested lot at its own permanent URL, with the original PDF, a certificate ID, the lab's name, and a link to the lab's own certificate search. Its COA pages also state what the testing does not show, which is unusual and worth crediting.

14 tested lots published, with purity between 99.68% and 99.86% (RP-HPLC)
Identity by LC-MS/MS and measured content reported, not just a purity percentage
Vial label carries a Data Matrix code that resolves to that lot's certificate
74-compound free Research Library plus lab calculators

Buyer fit

Who this may suit

US-based researchers who want to check a specific lot's documentation before buying, and who are comfortable with payment methods that offer little recourse once funds are sent.

Positioning: Per-lot published COAsBased in: Phoenix, AZPayment: Crypto, Zelle, Venmo, Cash App, PayPal

Review summary

Where it looks strongest

Documentation is the strongest part of the site. Certificates are public without an account, tied to lot numbers, and the supplier encourages checking them with the lab rather than trusting its own copy.

Trust signals

What the site communicates clearly

A named LLC, a named testing lab, public prices, published shipping rates and cut-off time, plain-packaging and tracking policies, and consistent research-use-only language on every page we checked.

Potential drawback

What to double-check

Testing covers only part of the catalog, the listed payment methods are largely irreversible, and a few details on the supplier's own site conflict with each other (see "What to watch").

Ideal buyer

Who this page points toward

A buyer who has found the lot they want on the COA index, matched it to a product page, and accepts that one lot's results do not guarantee the next.

Testing and COAs in detail

What the certificates show, what they don't, and how to check them.

What is tested

Identity, purity, and content

Per the COA index, identity is confirmed by LC-MS/MS, purity is measured by RP-HPLC at 214 nm, and content is quantified by HPLC against a reference standard. A sample lot page we opened (BPC-157 10mg, lot BPC-20260828-01, certificate COA8895) reported 99.74% purity and 10.63 mg measured content against a 10 mg label. The same pattern holds across the published lots: measured content generally runs slightly above label, for example 31.38 mg on a 30 mg semaglutide vial and 103.58 mg on a 100 mg GHK-Cu vial.

Who tests it

Bioviridian Inc.

The certificates name Bioviridian Inc. as the issuing laboratory and link to the lab's public certificate search (bioviridians.com/coa-search.html) so a reader can look up the certificate ID there. We have not run that lookup ourselves, and the supplier's own lot page states that independent issuer confirmation has not been recorded for its assessment. Treat the cross-check as your step to take.

Coverage

14 lots, not the whole catalog

The home page, About page, and COA index all say published lots are a subset of the catalog and grow with each fill, and that products without a certificate are listed without one. That honesty is a plus, but it means many products have no public certificate yet. Check the COA index for the exact product and size you want. Published lots include semaglutide, tirzepatide (30 and 60 mg), retatrutide (15 and 30 mg), BPC-157, GHK-Cu, KPV, MOTS-c, KLOW, and the GLOW blend.

Stated limits

What the certificates do not establish

On the lot page we reviewed, the supplier states that results apply to the submitted sample, not necessarily every vial with that lot label; that it has not commissioned sterility or endotoxin testing for the material; that the report has no residual-solvent result; and that results do not establish suitability for human or veterinary use. Purity and identity are useful, but they are not a full quality picture, and that includes sterility and endotoxin, which matter for any material used in cell work.

How to use this

A practical check before ordering

Find your product and size on the COA index and note the lot number
Open the certificate PDF and confirm the lot, certificate ID, and lab name match
Look up the certificate ID on the lab's own search page
When the order arrives, match the lot printed on the vial to the certificate

Research library and free tools

Useful reference material that sits alongside the storefront.

Research Library

74 compound monographs, 179 references

The Research Library is organized by compound, compound class, and mechanism. The supplier states each monograph lists identifiers (CAS, PubChem CID, UNII), formula, mass and sequence where verified, recorded molecular targets, and the papers behind them. The index page shows 74 published compounds, 179 verified references, 15 mechanism records, and a methodology and glossary section. It is also candid about contested science: the innate repair receptor record, for example, describes the evidence for and against the proposed complex rather than presenting it as settled.

Free lab tools

Calculators and reference tools

Reconstitution calculator for stock concentration in mg/mL or IU/mL
Printable vial label generator
Peptide receptor map linking compounds to recorded molecular targets
Peptide sequence comparisons

These are conveniences for lab work, not evidence of product quality, but they add real utility beyond a bare storefront.

A caveat on the library

It is published by the seller

The library is written and maintained by Purely Peptides, a commercial supplier, and its pages say as much. It reads as carefully sourced, but read it as a seller's reference, not independent review, and check the cited papers yourself.

Catalog and pricing

What was listed on the home page when we checked.

Catalog

What is carried

According to the About page: GLP-1 and multi-receptor incretin agonists (semaglutide, tirzepatide, retatrutide), tissue-repair peptides (BPC-157, TB-500, GHK-Cu), nootropic peptides (Semax, Selank, P21), mitochondrial peptides (MOTS-c), and longevity compounds (Epithalon, NAD+), plus oral formulations, ancillaries, bundles, and a proprietary GLOW blend.

Observed prices

Public pricing, no account needed

Prices as shown on October 8, 2026 and may change. The site was also advertising 15% off orders of $150 or more with code FALL15 through October 15. That is the supplier's own promotion, not an arrangement with this site.

Shipping and payment

Where the details are good, and where they disagree.

Shipping

Ships from Phoenix, AZ

The Shipping page lists same-day processing for orders before 2 PM MST, plain unmarked packaging, emailed tracking, and these US rates: Standard USPS $5 (3-5 business days), Priority $10 (1-3 business days), and Express/Overnight $40, with free Priority shipping on US orders of $100 or more before discounts. Published rates and cut-off times are a good sign.

Payment methods

Crypto, Zelle, Venmo, Cash App, and PayPal

The supplier lists these methods and says credit-card processing is "coming soon." Crypto, Zelle, Venmo, and Cash App payments are generally difficult or impossible to reverse once sent. PayPal has its own dispute process, but we cannot confirm how it treats purchases in this category. Until card processing arrives, assume a problem order is settled at the seller's discretion.

Mixed messages on shipping

Submission says US only; the Shipping page says worldwide

The supplier told us it ships to the USA. Its own Shipping page says "we ship worldwide," with international rates calculated at checkout and customs fees on the buyer. That page also still displays an expired summer-sale banner, so it may be out of date. International buyers should confirm with the supplier before ordering.

Hard-to-reverse payments

Little recourse if something goes wrong

With card payments not yet available, there is no card-style chargeback. This is the same payment-risk pattern we flag for other suppliers in the directory that rely on peer-to-peer apps.

Testing is partial and self-reported

A published certificate is not a guarantee for your vial

The supplier chooses which lots to test and publish, results apply to the submitted sample, and no sterility or endotoxin testing is reported. Match your vial's lot to a certificate and verify it with the lab.

New operation

Short track record

The oldest certificates we saw were issued in late August 2026, and we found no independent customer-review history to lean on. That is common for a new supplier, but it means fewer outside signals than an established one.

Common questions

Quick answers about this supplier.

Does Purely Peptides publish COAs?

Yes, for 14 tested lots, each at its own page with a downloadable PDF. Not every product has one yet.

Who tests the products?

The certificates name Bioviridian Inc. We have not independently confirmed them with the lab, but the supplier links to the lab's certificate search so you can.

Did you order from them?

No. This review is based on the supplier's submission and public website, checked on October 8, 2026.

Can I pay by card?

Not yet. The supplier lists crypto, Zelle, Venmo, Cash App, and PayPal, with credit processing "coming soon."

Is this for human use?

No. Everything is sold for in-vitro laboratory and educational use only, and nothing on this site is medical advice.

Editorial take

Unusually candid documentation, early-stage track record

Purely Peptides does several things better than most suppliers in this directory: lot-level certificates, a named lab with a public lookup, measured content alongside purity, and plain disclosure of what testing does not cover. Against that sit partial test coverage, hard-to-reverse payment options, a short history, and some inconsistent shipping details on its own site. We are not rating this supplier on product quality, because we have not tested product.

Bottom line

Quick verdict

Worth considering if the lot you want has a published certificate you have checked with the lab. Confirm shipping terms directly, and go in knowing payment is effectively final once sent.