NextGenPeps is the more transparent of the two on our transparency method (8.0 vs 7.0). It names its two labs, Janoshik and BioRegen, on every entry in its COA library, publishes its legal entity and street address, and keeps its content strictly research-use. PSPeptides posts dated COAs for about 60 products and is easier to buy from, with same-day shipping, the widest payment options on our list and our 10% code. But its blog publishes human dosing guides, and it doesn't name its lab on its site. NextGenPeps is #2 and PSPeptides #3 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
| NextGenPeps | PSPeptides | |
|---|---|---|
| Transparency score (method) | 8.0 | 7.0 |
| Entity and address | NUTRL LLC, 1331 Columbia St, San Diego, CA | New Jersey; no legal entity on site |
| Business age | Founded 2025; domain April 2025 | Claims 5+ years; domain November 2025 |
| COA format | ~49 dated entries with purity; some endotoxin | ~60 products, dated by month, test IDs |
| Lab named | Janoshik and BioRegen, on each entry | Not on site; North American Diagnostics on PDFs we opened |
| Finnrick | No profile | Profile, 0 tests |
| Labeling issues | GLP-RT, GLP-TZ, GLP-S codes | Human dosing guides; "Shred Express" bundle |
| Processing | 1-3 business days, USPS only | Same day before 2PM EST |
| Free shipping | Over $150 | Over $200 (UPS 2nd Day Air) |
| Ships to | US, Puerto Rico, US territories | US, Canada, EU, UK, Australia |
| Payment | Cards, PayPal, Apple Pay | Cards, Apple/Google/Shop Pay, Cash App, Zelle, Afterpay, Klarna |
| Coupon code | None (10% sign-up offer) | CHECKED, 10% off |
| Trustpilot | 3.1/5, 21 reviews | 4.2/5, 175 reviews |
| FDA warning letter | None found | None found |
Sources: NextGenPeps homepage, NGP COA library, NGP terms, NGP shipping, NGP WHOIS, PSPeptides homepage, PSP certifications, PSP about, PSP payments, PSP WHOIS, Finnrick: PSPeptides, FDA warning letters.
COAs and labs
NextGenPeps' COA library had about 49 entries, roughly three-quarters from BioRegen and the rest from Janoshik, dated July 2025 to June 2026. Each entry names the lab and shows purity, and some include an endotoxin result. The library doesn't show lot numbers or verification keys, so you'll need the report number from the PDF to use Janoshik's or BioRegen's lookup, and support to match a report to your lot.
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. Its site says only "independent, accredited laboratories," and its "Verify" page looks up orders, not certificates.
PSPeptides edges ahead on COA publication on our transparency method (9.0 vs 8.5) because of volume and batch numbers. NextGenPeps leads clearly on lab traceability (8.75 vs 6.75), since you know which lab to ask and both labs offer public lookups. See how to read a peptide COA.
Independent testing: a tie at zero
We found no Finnrick profile for NextGenPeps, and Finnrick lists PSPeptides (as "ProSupply PS Peptides") with 0 tests. Both get the floor score (5.0). See what is Finnrick?
Labeling: the biggest difference
NextGenPeps' terms require buyers to warrant they won't administer products to any human or animal, and its affiliate rules bar affiliates from suggesting human use. We saw no dosing content. The deduction is for three GLP-1-class products sold only under codes: GLP-RT, GLP-TZ and GLP-S.
PSPeptides carries research-use disclaimers, but its 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."
NextGenPeps scores 8.25 on this factor; 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
NextGenPeps publishes "NUTRL LLC, a California limited liability company doing business as NextGenPeps" with a San Diego street address (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). Its domain was registered in November 2025, and we couldn't verify the manufacturing claim (7.5).
Shipping and payment
PSPeptides is faster and more flexible here.
- 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 lists Visa, Mastercard, Amex, Discover, Apple Pay, Google Pay, Shop Pay, Cash App, Zelle, Afterpay and Klarna (payment options), but not PayPal.
- NextGenPeps processes orders in 1-3 business days and ships by USPS only from California, free over $150, to all 50 states, Puerto Rico and US territories (policy). It's the only vendor on our list that takes PayPal. Wrong items are guaranteed a reship (reship policy).
See fastest shipping peptide vendors and vendors that accept credit cards.
Price and codes
Prices checked September 26, 2026:
- BPC-157 5 mg: NextGenPeps $37; PSPeptides $49.99.
- TB-500 10 mg: NextGenPeps $72 on the product page ($58 on sale on the category page); PSPeptides $79.99, or $71.99 with code 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. NextGenPeps offers 10% off a first order for email sign-up. More in cheapest peptide vendors.
Reputation
PSPeptides had 4.2/5 from 175 reviews on a Trustpilot profile that invites reviews. NextGenPeps had 3.1/5 from 21 reviews, split between 5-star and 1-star (Trustpilot). Some NextGenPeps reviewers confused it with NextGen Peptides (ngpeptide.com), a separate company.
Which should you choose?
- If you want named labs, clean research-use content and published business details, NextGenPeps scores a full point higher. Visit NextGenPeps.
- 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, ask for the COA that matches your lot and confirm it with the lab. For lab-handling unit math, use our reconstitution calculator.
Related: best peptide vendors in the USA · American Peptides vs PSPeptides · NextGenPeps vs Peptide Plugs · Swiss Chems vs PSPeptides