Peptide Plugs is the more transparent of the two on our transparency method (8.1 vs 7.0), and it had the lower price per mg on the items we checked. Its product pages give a lot and a lab accession code you can look up on Freedom Diagnostics' own site, and it publishes its LLC and street address. PSPeptides posts dated COAs for about 60 products and is easier to buy from, with same-day shipping, international delivery, the widest payment options on our list and our 10% code. But its blog publishes human dosing guides. Neither has independent test data as of September 26, 2026. PSPeptides is #3 and Peptide Plugs #5 in our editors' order, which isn't sorted by score.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. This comparison covers supplier transparency only, based on public documentation. We didn't purchase or test products, and we don't repeat dosing content.
Side-by-side
| Peptide Plugs | PSPeptides | |
|---|---|---|
| Transparency score (method) | 8.1 | 7.0 |
| Entity and address | Austin Research Products LLC, 126 Holmes Rd #8, Liberty Hill, TX | New Jersey; no legal entity on site |
| Business age | Domain registered December 2025 | Claims 5+ years; domain registered November 2025 |
| COA format | 117 dated COAs, 62 products, purity and measured content | ~60 products, dated by month, test IDs |
| Lab named | Freedom Diagnostics, on site and each entry | Not on site; North American Diagnostics on PDFs we opened |
| Lab-side check | Accession code on product pages, linked to lab search | No verification key on the COA we opened |
| Finnrick | Profile, 0 tests | Profile, 0 tests |
| Labeling issues | "Weight Loss"/"Anti-Aging" categories; "GLP3 + Elora" | Human dosing guides; "Shred Express" bundle |
| Free shipping | Over $200 (UPS) | Over $200 (UPS 2nd Day Air) |
| Ships to | US only | US, Canada, EU, UK, Australia |
| Payment | Credit card (networks not listed in text) | Cards, Apple/Google/Shop Pay, Cash App, Zelle, Afterpay, Klarna |
| Coupon code | None found | CHECKED, 10% off |
| Trustpilot | No page found | 4.2/5, 175 reviews |
| FDA warning letter | None found | None found |
Sources: Peptide Plugs homepage, PP COAs, PP terms, PP shipping, PP WHOIS, PSPeptides homepage, PSP certifications, PSP about, PSP payments, PSP WHOIS, Finnrick: Peptide Plugs, Finnrick: PSPeptides, FDA warning letters.
COAs and lab verification
Both publish plenty of certificates. The difference is whether you can check them outside the vendor's own site.
Peptide Plugs' COA page listed 117 certificates across 62 products, each with the test date, the lab, purity and measured content. Product pages add a lot and an accession code, with a link to Freedom Diagnostics' COA search. The BPC-157 page, for example, shows 99.56% purity and 20.86 mg measured for a 20 mg vial. Because the lookup runs on the lab's site, it's a stronger check than a PDF alone. The main COA page doesn't show lots, and we found no sterility or endotoxin reports.
PSPeptides' certifications page covers about 60 products, dated by month. The certificate we opened came from North American Diagnostics, with a batch number and 99.96% purity, but no accreditation or verification key. Its BPC-157 product page links heavy metals, endotoxin, sterility and fentanyl reports, which Peptide Plugs doesn't publish. Its site doesn't name the lab, and its "Verify" page looks up orders, not certificates.
Peptide Plugs leads on COA publication (9.25 vs 9.0) and by more on lab traceability (9.0 vs 6.75). See how to read a peptide COA.
Independent testing: a tie at zero
Finnrick tracks both, Peptide Plugs and PSPeptides (as "ProSupply PS Peptides"), but shows 0 tests for each. Both get the floor score (5.0). Peptide Plugs' about page offers $100 store credit for verified COAs from Freedom Diagnostics, Finnrick or Janoshik, but we found no published results from it. See Janoshik vs Finnrick.
Labeling
Both carry research-use disclaimers, and both lose points. PSPeptides loses more.
- Peptide Plugs' footer says it makes "no health, dosing, or therapeutic claims of any kind," and we saw no dosing content. But its shop is organized into categories named "Weight Loss," "Anti-Aging," "Sleep" and "Vitality," and it sells a coded GLP-1-class blend, "GLP3 + Elora," plus some tablets.
- PSPeptides' blog publishes dosing guides, such as a retatrutide page titled "Week-by-Week Chart." Bundles are named "Shred Express," "Cut & Glow" and "Turn Back Time," and the Shred Express page calls it "designed for multi-pathway fat loss and metabolic research."
Peptide Plugs scores 7.5 on this factor and PSPeptides 5.75, the lowest on our list. FDA has said a research-use label doesn't protect a seller whose content points to human use (background). We cover GLP-1-class products for research use only, with no dosing content.
Business details
Both domains date from late 2025. Peptide Plugs publishes its legal entity and a Liberty Hill, TX street address in its terms (9.5 on our scale). PSPeptides says it's New Jersey-based with a 25-person team and claims "over 5 years in business" and US cGMP manufacturing (about). We couldn't verify either claim, and it publishes no legal entity (7.5).
Shipping, payment and returns
Both offer free shipping at $200, but PSPeptides is faster and more flexible.
- PSPeptides says orders before 2PM EST ship the same day, with free UPS 2nd Day Air over $200, and ships to Canada, the EU, the UK and Australia as well as the US (homepage). It takes every major card, Apple Pay, Google Pay, Shop Pay, Cash App, Zelle, Afterpay and Klarna (payment options).
- Peptide Plugs ships by UPS only within 1-2 business days from Texas, US only (policy). Its site advertises credit card checkout but doesn't list networks in text. All sales are final; damage must be reported within 7 days for a replacement or store credit (refund policy).
Price and codes
Prices checked September 26, 2026:
- BPC-157: Peptide Plugs $50 for a 20 mg vial ($2.50/mg); PSPeptides $89.99 for 10 mg ($9.00/mg), or $80.99 with code CHECKED ($8.10/mg).
- TB-500 10 mg: Peptide Plugs $50; PSPeptides $79.99, or $71.99 with CHECKED.
PSPeptides code CHECKED gives 10% off. See our PSPeptides coupon code page. We may earn a commission if you use it, and that doesn't change the rating. Peptide Plugs has no public code, but runs a points program and lower multi-vial prices. Even with the code, Peptide Plugs was cheaper per mg on both items. See cheapest peptide vendors.
Reputation
PSPeptides had 4.2/5 from 175 reviews on a Trustpilot profile that invites reviews, with complaints about delayed orders among the negatives. We found no Trustpilot page for Peptide Plugs. Don't confuse it with The Peptide Plugs, which describes itself as a Canadian store.
Which should you choose?
- If you want to verify a certificate at the lab, published business details and a lower price per mg, Peptide Plugs scores highest on our list. Visit Peptide Plugs.
- If same-day shipping, international delivery, buy-now-pay-later or a 10% code matters more, PSPeptides offers those, with the weakest labeling on our list. Visit PSPeptides.
Either way, match your lot to a dated report and confirm it with the lab. For lab-handling unit math, use our reconstitution calculator.
Related: best peptide vendors in the USA · NextGenPeps vs Peptide Plugs · NextGenPeps vs PSPeptides · Swiss Chems vs PSPeptides