Simple Peptide Review: 170 Lab-Confirmed COAs, but Underfilled Vials

Last verified October 31, 2026. Amino Review does not run lab tests. Every finding below is labeled by its source, as described in How We Evaluate Vendors. Simple Peptide (simplepeptide.com) is run by Melex Technologies Inc. of Florida. The look-alike domain simplepeptides.com, with an “s”, is a parked page, not a store.

The short verdict

Evidence label: Laboratory-confirmed document. Grade: C (5/10). Simple Peptide’s certificates are real. Its public archive holds 172 distinct Freedom Diagnostics reports, and 170 of them (98.8%) are on Freedom’s own server with the same results. Every peptide report confirms identity by mass spectrometry, and the newest is dated October 22, 2026. But the same lab-confirmed archive shows vials well under their labels: a KLOW blend with 7.99 mg of KPV in a 10 mg slot (80%), two Pinealon 10 mg lots at about 8 mg, and a 5-Amino-1MQ 10 mg lot at 8.01 mg, among others. Under our rubric that costs 2 points.

The business side is mixed. The company is named and registered, and unopened items can be refunded to the original payment method within 30 days. But fewer than half of the research compounds in its product list have any certificate. Its policy pages give four different cancellation windows. And its claim that COAs from May 2026 onward “include sterility” is not borne out by its own reports. See our vendor comparison for how the grade is calculated.

What the COAs actually show

Where the reports come from

Simple Peptide has a public COA archive at simplepeptide.com/coa/, searchable by product, lot or accession number, with no login needed. On October 31 it returned 174 entries: 85 PDFs dated February to October 2026 and 89 older images dated May 2025 to February 2026. Two images repeat the same report, so there are 172 distinct reports. All are from Freedom Diagnostics. Most are made out to “Simple Peptide”; three are made out to “Wholesale”, which matches “Simple Peptide Wholesale”, a trade name the owner registered in Florida.

Each report has a search code that opens the lab’s own copy. We checked all of them. Lab-confirmed: 170 of the 172 reports are on Freedom’s server. 82 of the PDFs are byte-for-byte identical to the lab’s file. For the 87 older images, we read each image and compared it with the lab’s PDF; product, purity and measured content match on all of them. On three reports, the lot text differs slightly from the lab’s current copy (for example GLOW-0621026-1 versus GLOW-062026-1). In each case the lab’s file was created after the report date and all values are identical, so we read these as lab corrections, not edits. We found no altered copies. Confirmed reports are real, but they are not independent: Simple Peptide chose and sent the samples.

Two reports are not on Freedom’s server: Tesamorelin/Ipamorelin 12/2 mg (lot TSIPI22-042026-3) and Melanotan 1 10 mg (lot MT1-052026-7). Their results look normal, but we could not confirm them.

What is tested, and what is not

• Identity by LC-MS, HPLC purity and measured content on every peptide report.
• Endotoxin (USP <85>, LAL) on 66 reports, starting in late February 2026.
• A PCR microbial screen (“No Detectable Microbial DNA”) on 22 reports, starting May 29, 2026. That is a DNA screen, not a compendial sterility test.
• No heavy-metals testing on any report.

Accreditation

Freedom Diagnostics says it is “compliant with ISO 9001 / GLP principles” and claims no ISO 17025 accreditation. Simple Peptide makes no accreditation, GMP or ISO claim that we found. Almost no lab is accredited for peptide testing, so we do not score accreditation.

Results worth reading closely

• Measured content below 90% of label (lab-confirmed). KLOW Blend 50/10/10/10 mg, lot Klow-032026-4 (March 2026): KPV 7.99 mg of 10 (79.9%). KLOW lot KLOW-032026-1 (March 2026): Thymosin Beta-4 8.49 mg (84.9%) and KPV 8.74 mg (87.4%). Pinealon 10 mg: 8.10 mg (81.0%, September 2025) and 8.01 mg (80.1%, July 2025). 5-Amino-1MQ 10 mg: 8.01 mg (80.1%, July 2025). Melanotan II 10 mg: 8.83 mg (88.3%, September 2025). Ipamorelin in two Ipamorelin/CJC-1295 5/5 mg lots: 4.29 mg (85.8%) and 4.39 mg (87.8%, mid-2025).
• Gut Inflammation Research Formula 1500 mcg capsules (lot GI-052026-7, May 2026, lab-confirmed): the three measured peptides add up to 1.11 mg, 74% of the 1,500 mcg on the report. The amount of each peptide on the label is not public.
• Current single-compound reports are better. Every single-compound report from October 2026 measures at least 91% of label; the lowest is Epitalon 10 mg at 9.11 mg.
• Purity never falls below our 95% threshold. The lowest is Tesamorelin at 98.241% (January 2026). That is below the vendor’s stated “99% purity or better where the molecule supports it”, for a molecule it reports above 99% on other lots.
• Overfills are common: Ipamorelin in Tesamorelin/Ipamorelin blends at 158–190% of its 2 mg, AOD-9604 5 mg at 149–157%, BPC-157 in one BPC/TB4 vial at 142%, Sermorelin 5 mg at 140%, and MOTS-C 10 mg up to 140%. We note these but do not penalize them. They do mean the label is not a reliable guide to what is in the vial.
• Right product: every archive entry is labeled with the product on its report. Product pages are behind a login, so we could not check which report each product page links to.

Lot numbers

Most lots are coded by product, size and month (for example MOT10-052026-1), and they match the lab’s records apart from the three corrected lot texts above. Some are weaker. Bacteriostatic water uses bare month codes, and one lot covers both the 10 ml and 30 ml bottles. A few lots have no product prefix, and Tesofensine capsules carry what look like supplier lot codes. The archive’s typed “Lot Number” column also has typing errors (for example “CJC/PA5072525025-03” for CJCIPA507252025-03), so search by accession number if a lot search finds nothing.

Coverage

Coverage is the big gap. Simple Peptide’s public product sitemap lists 65 research compounds, and only 29 of them (45%) have any report in the archive. Among those with none are BPC-157 (vials and capsules), GHK-Cu 100 mg, Selank, Semax, KPV, IGF-1 LR3, CJC-1295 with DAC, Kisspeptin, LL-37, DSIP, NAD+ and Thymalin. TB-500’s newest report is from August 2025. The vendor also sells GLP-class compounds (Finnrick has tested its Retatrutide, Tirzepatide and Semaglutide), but they are absent from the sitemap and the public archive, and the site’s robots.txt blocks GLP-named files. The catalog, prices and per-product lot details are visible only to signed-in accounts, which we did not create.

Independent testing (Finnrick)

Finnrick, a testing site that tests samples it buys or that the public mails in, lists 51 tests of Simple Peptide products as of October 31, 2026: 30 passes and 21 fails, a 62% rating that ranks it 404th of 489 vendors. Finnrick’s pass bar (purity of 99.5% or more, dose within 35%) is different from ours. By product, CJC-1295 (26%), BPC-157 (48%) and Melanotan II (54%) rate lowest, and GHK-Cu (84%) and Tirzepatide (81%) highest. One Retatrutide test from July 9, 2026 is marked “Identity Fail — not the labeled substance.” Finnrick’s June vendor report also describes a disputed 2025 Retatrutide batch. These are Finnrick’s findings; we did not see the underlying records, and they are not part of the score.

Business and policies

• Identity (Florida records): the site says it is “owned and operated by Melex Technologies Inc.” Melex is an active Florida corporation (document P19000056045), formed July 18, 2019, with Alexander and Melissa Ehrenthal as officers; the site names both as founders. Melex has also registered “Simple Peptide”, “Simple Peptide Wholesale” and “Alpha Omega Peptide” as trade names. The site’s address, 6586 W Atlantic Ave Ste #1112, Delray Beach, is a shopping center that houses a FedEx and UPS shipping store, so it is likely a mailbox. We did not confirm that. Terms choose Florida law.
• Returns (vendor statement): “we offer a 30-day refund guarantee… the product must be unused and unopened… Refunds are issued to your original payment method.” There is no restocking fee. The buyer pays return shipping, and opened vials are handled “on a situational basis only”. The Terms add that refunds are “less original shipping and handling”, need a return authorization number, and that “certain products may be designated on the Site as non-returnable”.
• Policies that disagree (vendor statements): orders can be changed or cancelled “within 30 minutes” (Shipping & Returns), “within 60 minutes” (Refund Policy), “often… within 24 hours if they haven’t shipped” (FAQ), or “at any time prior to shipment” (Terms). The refund clock runs from the purchase date on two pages and from delivery in the Terms.
• Claims to read carefully (vendor statements): “COAs issued May 2026 and later include sterility, endotoxin, purity, and net peptide content testing”, yet 31 of 53 such reports have no microbial test at all, and the rest use a PCR screen. “U.S.-based Manufacturing” and “disciplined U.S.-based production”, with no manufacturer or facility named. In an October 27, 2026 press release, the owner said its new sister brand’s ingredients are “manufactured by Remetide”, a firm whose website says its factory is in China. That does not prove where Simple Peptide’s vials are made. “Independent third-party testing”, for tests the vendor orders.
• Payment (vendor statement): major credit cards, which are easier to dispute than bank transfers or crypto.

Reputation

We checked Trustpilot ourselves on October 31, 2026. The page for simplepeptide.com says: “This profile has been removed. The business you’re trying to find goes against our guidelines and is no longer visible on Trustpilot.” Trustpilot does not say what the breach was. Separately, an unclaimed profile under the look-alike simplepeptides.com shows 3.3 stars from 17 reviews, 7 of them one-star. Several of those reviews name SimplePeptide.com, and complaints include empty vials and low-quality Retatrutide. On Reddit, buyers praise fast shipping and long-running GLP orders. Others report contaminated vials and bacteriostatic water, unanswered emails, and being muted on the company-run subreddit after complaining. Those are anecdotes, not test results.

Red flags at a glance

• Lab-confirmed vials well under label: KLOW (KPV 80%, Thymosin Beta-4 85%), Pinealon (80–81%), 5-Amino-1MQ (80%), Melanotan II (88%) and Ipamorelin in Ipa/CJC blends (86–88%).
• Fewer than half of the research compounds in the product list have any certificate, and GLP-class products have none in the public archive.
• A “sterility” claim for May 2026+ reports that most of those reports do not support.
• Four different cancellation windows and two refund clocks across the policy pages.
• “U.S.-based Manufacturing” with no manufacturer named, and a likely mailbox address.
• A 62% Finnrick rating (30 of 51 tests passed), a Trustpilot profile removed by Trustpilot for breaching its guidelines, and a look-alike Trustpilot profile with 41% one-star reviews.

What it does well

• 170 of 172 published reports confirmed on the lab’s own server, with no altered copies found.
• A public, searchable archive with a lab search code on every report, and reports as recent as October 22, 2026.
• Mass-spectrometry identity on every peptide report, plus endotoxin testing on most 2026 reports.
• A named, registered Florida company.
• 30-day refunds on unopened items to the original payment method, with no restocking fee.

Who it is for

Simple Peptide suits buyers who check paperwork themselves and buy products with recent reports: nearly every report opens on Freedom’s server, and the October 2026 single-compound reports are close to label. It is a poor fit for blends, older lots, or anything without a report, and for anyone who needs sterility data. Find the report for the exact lot on your vial, read the measured amount for every component (not just the purity), and keep unopened vials sealed if you might want a refund.

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Is Simple Peptide legit?

On the evidence we could check, Simple Peptide’s certificates are real: 170 of the 172 Freedom Diagnostics reports in its archive are on the lab’s own server with the same results, and every peptide report confirms identity by mass spectrometry. It is run by Melex Technologies Inc., an active Florida corporation, and unopened items can be refunded within 30 days. The main concerns: lab-confirmed vials measure well under label (as low as 80%), fewer than half of the research compounds it lists have any certificate, its “sterility” claim for reports from May 2026 is not borne out, its policy pages give four different cancellation windows, and Trustpilot removed its profile for breaching its guidelines. Grade: C (5/10). Products are sold for research use only.

Are Simple Peptide’s COAs real?

Yes, for 170 of 172. Each report carries a lab search code, and those 170 are on Freedom Diagnostics’ server with the same results; we found no altered copies. The underfilled vials in this review come from those same lab-confirmed reports. Real is not the same as independent: Simple Peptide chose and sent the samples.

What do Reddit users say about Simple Peptide?

Opinions are mixed. In three threads in r/Biohackers and r/PeptideForum (2024 to 2026), some buyers praise fast shipping and long-running GLP orders. Others report contaminated vials and bacteriostatic water, unanswered emails, a batch with no matching COA at the lab, and being muted on the company-run subreddit after complaining. These are anecdotes, not test results.

Vendors: dispute a finding

If you represent Simple Peptide and think a finding here is wrong, email vendors@aminoreview.com with the report or lot number and your evidence. We recheck it with the issuing lab within 7 days. Any grade change is noted on this page with the date.

Oct 31, 2026: corrected the Trustpilot finding; the profile was removed by Trustpilot, not missing.

Research use only: products discussed here are sold by third-party vendors, labeled for research use only, and are not approved drugs. This review assesses public documentation; it is not medical, legal, or purchasing advice. See our full disclaimer. Corrections are welcome at contact@aminoreview.com.