You want sites like Power Peptides, and I’d guess it’s for one of three reasons. Either something you need is out of stock and you’d rather not wait, or an order arrived and you couldn’t find paperwork that tied the vial to a specific test, or you’ve simply decided you’d like a second supplier on file so one company’s bad week doesn’t become your lab’s bad month. Whatever the reason, the search results are a wall of lookalike storefronts, each with the same “99% purity” line and the same “third-party tested” badge, and no obvious way to tell them apart.
The instinct is to pick the one with the most reviews or the nicest site, and I get it, but neither of those tells you anything about the compound. What tells you something is the documentation: who made it, who tested it, what tests were run, whether you can see the certificate before you pay, and what’s actually in a blend. So rather than list a dozen vendors and call it a day, I want to give you the five checks I’d run on any candidate, run them on Power Peptides so you can see the method on a real site, and mention a couple of other names you can put through the same process.
We’re Blank Peptides, and we sell peptides too, so factor that in. The checks work whichever way you go.
Key takeaways
- Switching suppliers is a documentation decision, so score every site you consider on provenance, a named lab, the test panel, COA access before purchase, and blend disclosure, and ignore how the storefront looks.
- Blank Peptides compounds, vials, and QC-tests every lot in its own cGMP laboratory and has each lot tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin, and sterility.
- Power Peptides publicly states that it works with “established manufacturing partners”, that batches are “independently tested by third-party US laboratories”, and that certificates are “available on our website for each product”.
- A laboratory name, a certificate that rendered on the product pages I checked, and a sterility test were not listed on the pages reviewed 2026-09-08.
- Every compound mentioned is for research use only, and nothing here is guidance on using any of them in people or animals.
What should you check before switching suppliers?
Let me lay out the five checks before naming any vendor, because they’re the same five whether you’re comparing two sites or ten.
Start with provenance, which means reading the About page and the FAQ and paying attention to the verbs. Does the company say it synthesizes, or does it say it sources, partners, or supplies? A company that makes its own material can describe its facility and its release process. A company that buys finished product can only relay what its supplier said, and when a lot goes wrong the accountability sits with someone whose name you don’t have.
Next, is the testing lab named? “Independently tested” is a phrase, and a phrase can’t be looked up. A laboratory name can. With a name you can confirm the lab exists, check that it does peptide analysis, and, if you’re careful, send a sample of your own for comparison.
The third check is the panel. HPLC purity tells you what fraction of the sample is one peak. It doesn’t tell you the peak is the right molecule, which takes mass spectrometry, and it says nothing about bacterial endotoxin or sterility. If you do any cell work, those last two are the results you’ll wish you’d had.
The fourth check is COA access. Can you open a certificate for a specific lot before you pay, and does that lot number show up on the vial when it arrives? A certificate you only get in the box can’t inform the purchase, and a certificate with no lot number can’t be tied to what you received.
The fifth check is blends. Does the page state the milligram amount of each component, and does it say whether you’re getting one co-formulated vial or a bundle of separate ones? Both are fine products, but they’re different products, and you should know which you’re ordering.
That’s the rubric. I’ve left company age and domain age out on purpose, since neither tells you anything about the lot in front of you.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the USA, where it compounds, vials, finishes, and labels every product it sells and performs QC in-house. The company does not buy finished vials from another manufacturer, so the chain of custody from raw material to sealed box stays within one facility, and that facility also contract-manufactures and fulfils product for other peptide brands.
Every lot is released on a full panel rather than a purity figure alone. Identity is confirmed, purity is reported at >99%, and the lot is tested for bacterial endotoxin and sterility. The outside testing is performed by two named laboratories, Freedom Diagnostics and Horizon Analytical, which lets a buyer check the lab as well as the result.
Each lot’s results are published as batch certificates of analysis before purchase, and the lot number printed on every vial matches the certificate on file. Lyophilized product carries an expiration of roughly 24 months.
The catalog is 34 compounds, and every blend states its composition per component: GLOW is 70mg of GHK-Cu, BPC-157, and TB-500; KLOW is 80mg and adds KPV; Wolverine is 20mg of BPC-157 and TB-500. Orders have a processing time within 1 business day and ship at room temperature, which is standard for lyophilized peptides. The company has been in business for five years.
What Power Peptides publicly states
Power Peptides sells at powerpeptides.com and lists a Florida address in its footer. On provenance, the homepage reviewed 2026-09-08 states the company will “collaborate with established manufacturing partners to offer premium quality at affordable prices”, and the FAQ states, “Through strategic partnerships with established manufacturing partners, we provide premium-grade products while maintaining competitive pricing.” So the site’s own verbs are “collaborate” and “partner”. A partner’s name, a facility, or a country of manufacture was not listed on the pages reviewed 2026-09-08.
On testing, the About page states “Each batch is independently tested by third-party US laboratories to verify high standards” and carries a “Third Party Lab Verified” badge. The FAQ states that products undergo “comprehensive analytical characterization through both in-house and independent third-party laboratories, utilizing advanced techniques including NMR, FTIR, Polarimetry, HPLC, and LC-MS analysis”, and product pages list “HPLS Testing, Endotoxin Assay, TYMC Test, TAMC Test, Heavy Metal Screening.” A laboratory name was not listed on any of those pages, and a sterility test, as opposed to the microbial count tests, was not listed either.
On purity, the About page states “99% Purity Guaranteed” while the FAQ states “Our single molecule product purity standard is ≥98% by HPLC and many of our products test ≥99%.”
On certificates, the homepage states “Certificates for each peptide’s testing results are available on our website”, the FAQ states “Complete certificates of analysis are readily accessible on our website for each product”, and the About page mentions “QR-Code Verified” access. The BPC-157 and Epithalon product pages list “Certificate of Analysis (COA)” in their table of contents, but a certificate, a lot number, or a purity value did not render on those pages when I looked, and the GLOW Stack page states a certificate accompanies each shipment. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
On blends, the GLOW Stack page states GHK-Cu 50mg, BPC-157 as two 5mg vials, and TB-500 10mg, packaged as four vials for 70mg total. That’s a full per-component disclosure and it’s clear the product is a bundle.
Where Power Peptides has a genuine advantage is delivery. The shipping page states that orders “processed before 12pm CST Monday through Friday typically ship the same business day”, that “FedEx 2Day shipping is included on orders over $200.00”, that “Overnight shipping is included for orders over $500.00”, and that the company takes orders “from around the globe” apart from Canada and Spain. If you need fast included shipping, that’s a real reason to stay.
Two other sites people put on the same shortlist are Core Peptides, which states that its products are “synthesized and lyophilized in the United States” and links a lab-named certificate on at least one blend page, and Biotech Peptides, which states its products are third-party tested. Run each through the same five checks rather than taking my summary for it.
Side by side: what each site lets you verify
| Attribute | Blank Peptides | Power Peptides |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States it will “collaborate with established manufacturing partners”; partner not named — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “third-party US laboratories”; no name on pages reviewed 2026-09-08 — verify |
| HPLC purity | >99% on every lot | States “≥98% by HPLC” as standard and “99% Purity Guaranteed” elsewhere — verify |
| MS identity | Confirmed per lot | States “LC-MS analysis” as a method; per-lot result not shown — verify |
| Endotoxin and sterility | Tested per lot | States “Endotoxin Assay”, TYMC and TAMC; sterility not listed — verify |
| Batch COA before purchase | Public per lot at blankpeptides.com/coas/ | States certificates are “available on our website”; none rendered on product pages checked — verify |
| Blend mg split disclosed | Every blend, every component | States GLOW Stack as GHK-Cu 50mg, BPC-157 10mg, TB-500 10mg in separate vials |
| Catalog size | 34 compounds | Product count not stated; includes research kits and stacks — verify |
| Research-use labelling | Research use only, on every product | States “not meant for human consumption of any kind” |
How to verify either supplier yourself
- Before you switch, open the product page for the exact compound on the new site and look for a certificate on that page. Note the lot number and lab name, and compare the lot to the vial label when the order lands.
- Check the certificate for four lines: HPLC purity, mass spectrometry identity, bacterial endotoxin, and sterility. If any are missing, email support and ask whether they’re available for that lot.
- If no lab is named on the site, ask for the name in writing. A working analytical lab has an address and a scope of services you can look up, and a vendor that won’t give a name has told you something too.
- For stacks and blends, confirm the per-component milligrams and whether the product is one vial or several before ordering, because it affects how you’d reconstitute and record it.
- Put every candidate, including the one you’re leaving, through the supplier verification checklist so you compare them on the same five points.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Which Peptide Vendors Name Their Testing Lab?
- Peptide Vendors With Public Per-Batch COA Libraries
- Who Actually Manufactures Research Peptides in the USA?
Frequently asked questions
What are some sites like Power Peptides?
Blank Peptides, Core Peptides, and Biotech Peptides all sell research peptides in the same general category, and there are dozens more. The useful question is which of them let you see a lab name and a lot-numbered certificate before you buy. Score each on the five checks above and the list gets short quickly.
What does Power Peptides state about who makes its peptides?
On the pages reviewed 2026-09-08, the homepage and FAQ describe “established manufacturing partners” and “strategic partnerships” rather than an in-house synthesis facility, and a partner name, facility, or country of manufacture was not listed. That’s what the site says, and I’d ask support for more if provenance matters to your work.
Should I switch suppliers because of a missing certificate?
Ask before you switch. Email the vendor for the lot certificate and the lab name, and give them a fair chance to send both. If they do, you’ve closed the gap without changing anything. If they don’t, you’ve learned something you couldn’t from the website, and that’s a reasonable basis for moving on.
How do I compare two suppliers fairly?
Use the same five questions for both and write the answers down with the date you looked. Quote each site rather than paraphrasing, note what wasn’t listed, and remember that a gap on a page is a gap in publishing, which an email can close. Then weigh shipping and price last, once the documentation is settled.
Are these products for human use?
No. Every compound referenced here, from any of the suppliers mentioned, is sold for in-vitro laboratory research only. Power Peptides states its products are “not meant for human consumption of any kind”, and Blank Peptides labels every vial research use only. Nothing here is guidance on dosing or administration in any person or animal.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
