Ascension Peptides scores higher than PSPeptides on our transparency method (7.4 vs 7.0), mostly because of labeling. PSPeptides' blog publishes human dosing guides, which conflicts with research-use-only sales. Ascension uses strict research-use wording, but sells six products under codes and names no lab or legal entity on its site. PSPeptides offers wider shipping and payment options. We have codes for both: CHECKED (10% off at PSPeptides) and AFFILIATE50OFF (50% off a first order at Ascension). PSPeptides is #3 and Ascension #4 in our editors' order, which isn't sorted by score.
Notice: Both vendors sell products for in-vitro laboratory research only. They are not FDA-approved and not for human or animal consumption. 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
| PSPeptides | Ascension Peptides | |
|---|---|---|
| Transparency score (method) | 7.0 | 7.4 |
| Stated location | New Jersey; no legal entity on site | No entity or address on site; phone only |
| Business age | Claims 5+ years; domain registered Nov 2025 | Founded 2024, per a third-party review |
| COA format | ~60 products, dated by month, test ID per file | 85 records, searchable by batch/lot |
| Lab named | Only on PDFs (North American Diagnostics on the one we opened) | Not on site; MZ Biolabs per independent reviews |
| Finnrick | Profile, 0 tests | Profile, 0 tests |
| Labeling issues | Human dosing guides on blog; "Shred Express" bundles | Six code-named items; "GLOW"-style stacks |
| Ships to | US, Canada, EU, UK, Australia | US only |
| Payment | Cards, Apple/Google Pay, Zelle, Cash App, BNPL | Not listed on site |
| Returns | Not covered in our review | All sales final; damage within 24 hours |
| Our code | CHECKED (10% off) | AFFILIATE50OFF (50% off first order) |
| FDA warning letter | None found | None found |
Sources: PSPeptides homepage, PSP certifications, PSP about, PSP payment options, PSP WHOIS, Ascension homepage, Ascension COAs, Ascension terms, Finnrick: PSPeptides, Finnrick: Ascension, FDA warning letters.
Labeling: the deciding factor
This is where the scores split (5.75 vs 7.5 on our 5-10 scale).
PSPeptides carries research-use disclaimers, but its content points the other way. Its blog publishes dosage guides, including a retatrutide page titled "Retatrutide Dosage: Week-by-Week Chart 2026." Its shop lists bundles named "Shred Express," "Cut & Glow" and "Turn Back Time," and the catalog includes nasal sprays, topicals and oral tablets. We treat dosing content as the most serious labeling problem on our list.
Ascension Peptides says products are "Not for Human consumption of any kind," uses a 21+ age gate, and its terms say "IN-VITRO LABORATORY RESEARCH USE ONLY." We found no health claims on its homepage. It loses points for six products sold only as codes (C-10, R-10, R-30, S-5, T-10, T-30) and stack names like "GLOW."
FDA has said a research-use label doesn't protect a seller whose content points to human use (background). Both sell GLP-1-class compounds.
COAs and labs
Both publish plenty of certificates. Neither names its lab on its own COA page.
PSPeptides' certifications page covers about 60 products, dated by month with a test ID in each file name. The certificate we opened was issued by North American Diagnostics, with a batch number and HPLC-UV plus mass spectrometry, but no accreditation or verification key. The site's Verify page checks orders, not COAs.
Ascension's COA library has 85 records you can filter by product, SKU, batch/lot, purity and date. Independent reviewers at Project Biohacking and PepPal trace its certificates to MZ Biolabs in Tucson, AZ.
Ascension is slightly ahead on both COA publication (9.25 vs 9.0) and lab traceability (7.0 vs 6.75), mainly because its lot search makes it easier to find your certificate. Our COA guide explains how to check either.
Independent testing: a tie at zero
Finnrick tracks both, as "ProSupply PS Peptides" and "Ascension Peptides," and shows 0 tests for each as of September 26, 2026. Both get the floor score. See Janoshik vs Finnrick.
Business details, shipping and payment
PSPeptides says it's New Jersey-based with a 25-person team, and its Trustpilot details list a Paramus, NJ suite address. It claims "over 5 years in business," but its domain was registered in November 2025. Its US manufacturing and cGMP claims are unverified. It offers same-day shipping on orders before 2pm EST, free UPS 2nd Day Air over $200, and shipping to the US, Canada, the EU, the UK and Australia. Payment options include cards, Apple Pay, Google Pay, Shop Pay, Cash App, Zelle, Afterpay and Klarna.
Ascension lists a phone number and terms governed by Kansas law, but no entity or address. It ships only within the US and doesn't list payment methods on the pages we loaded. All sales are final, with a 24-hour window for damage claims.
PSPeptides scored slightly higher on business transparency (7.5 vs 7.0).
Reputation
PSPeptides' Trustpilot page had 175 reviews averaging 4.2/5, and the company invites reviews. PepPal reported a 4.8/5 Trustpilot score for Ascension across 100+ reviews as of May 2026, which we didn't confirm.
Coupon codes
- PSPeptides: CHECKED gives 10% off. PSPeptides doesn't publish stacking or exclusion rules we could find. See the PSPeptides coupon code page.
- Ascension Peptides: AFFILIATE50OFF gives 50% off a first order. Its partner page says the discount can vary by partner and promotion. See the Ascension Peptides coupon code page.
Both are our codes, last verified September 26, 2026. PeptideChecked may earn a commission from either. Codes don't change scores.
Which should you choose?
- If research-use labeling and lot-level COA search matter most, Ascension Peptides is ahead, and AFFILIATE50OFF is the larger first-order discount. Visit Ascension Peptides.
- If you need international shipping or a specific payment method, only PSPeptides offers them. Use CHECKED for 10% off. Visit PSPeptides.
Either way, ask for the COA that matches your lot and confirm it with the issuing lab. For lab-handling unit math, use our reconstitution calculator.
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