American Research Pens vs Ascension Peptides
Ascension Peptides scores higher, 77 to 43. The widest gap is testing & certificates. Same formula, same data fields, October 2026.
Factor by factor
| Factor | American Research Pens | Ascension Peptides | Edge |
|---|---|---|---|
| Testing & certificates | 33 | 100 | Ascension Peptides |
| Documentation depth | 25 | 68 | Ascension Peptides |
| Transparency | 66 | 94 | Ascension Peptides |
| Track record | 11 | 11 | Even |
| Catalog | 45 | 71 | Ascension Peptides |
| Pricing | 50 | 60 | Ascension Peptides |
| Ordering & service | 82 | 75 | American Research Pens |
Fact sheets side by side
| American Research Pens | Ascension Peptides | |
|---|---|---|
| Overall score | 43/100 (#32) | 77/100 (#2) |
| Status | Operating | Operating |
| Based in | US | Kansas City, MO (mailing address on contact page) |
| Founded | Not stated | Not stated |
| Third-party testing | Limited | Yes |
| Laboratories named | None named | Kovera Labs, MZ Biolabs |
| Public certificates | Not verified | Yes |
| Lot-specific certificates | Not verified | Yes |
| Formats | pens | vials, blends |
| Catalog size | ≈10 | ≈42 |
| BPC-157 5 mg listed price | — | — |
| Free shipping from | $250 | — |
| Payments | card, wire, ach, e-check, crypto | card, ach |
| Ships internationally | No | No |
| Research-use disclaimer | Yes | Yes |
| FDA warning letter | None found | None found |
Read the full reviews: American Research Pens review · Ascension Peptides review. Both suppliers sell materials labeled for laboratory research use only.
Both appear on: US-based suppliers · Suppliers that take card payments.
The factor that separates them
The widest gap is testing & certificates (33 vs 100). What that factor measures is explained in how to read a certificate of analysis and lot-level vs sample testing.
Related comparisons
Ascension Peptides vs Paramount Peptides · Ascension Peptides vs Core Peptides · Ascension Peptides vs Pure Peptide Labs
Frequently asked questions
Which is better, American Research Pens or Ascension Peptides?
On our formula Ascension Peptides scores higher (77 vs 43). The largest gap is in testing & certificates (33 vs 100). "Better" depends on what you weight; both fact sheets are on this page.
Do both publish certificates of analysis?
American Research Pens: not verified. Ascension Peptides: yes. Lot-specific certificates — American Research Pens: not verified; Ascension Peptides: yes.
Which is cheaper?
We could not compare a like-for-like listing; price tiers are premium (American Research Pens) and mid (Ascension Peptides).