Paramount Peptides vs Receptor Chem
Paramount Peptides scores higher, 76 to 50. The widest gap is documentation depth. Same formula, same data fields, October 2026.
Factor by factor
| Factor | Paramount Peptides | Receptor Chem | Edge |
|---|---|---|---|
| Testing & certificates | 88 | 40 | Paramount Peptides |
| Documentation depth | 65 | 0 | Paramount Peptides |
| Transparency | 100 | 78 | Paramount Peptides |
| Track record | 39 | 39 | Even |
| Catalog | 79 | 64 | Paramount Peptides |
| Pricing | 65 | 70 | Receptor Chem |
| Ordering & service | 45 | 90 | Receptor Chem |
Fact sheets side by side
| Paramount Peptides | Receptor Chem | |
|---|---|---|
| Overall score | 76/100 (#3) | 50/100 (#28) |
| Status | Operating | Operating |
| Based in | Irvine, CA | Stanmore, London |
| Founded | 2012 | 2011 |
| Third-party testing | Yes | Limited |
| Laboratories named | Janoshik | None named |
| Public certificates | Yes | Yes |
| Lot-specific certificates | Yes | Not verified |
| Formats | vials, capsules, blends | vials, bulk, blends |
| Catalog size | ≈78 | — |
| BPC-157 5 mg listed price | — | — |
| Free shipping from | $500 | — |
| Payments | Not stated | card, wire, crypto |
| Ships internationally | No | Yes |
| Research-use disclaimer | Yes | Not verified |
| FDA warning letter | None found | None found |
Read the full reviews: Paramount Peptides review · Receptor Chem review. Both suppliers sell materials labeled for laboratory research use only.
Both appear on: Suppliers with public certificates of analysis · Suppliers with peptide blends.
The factor that separates them
The widest gap is documentation depth (65 vs 0). 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 · Core Peptides vs Paramount Peptides · Paramount Peptides vs Pure Peptide Labs
Frequently asked questions
Which is better, Paramount Peptides or Receptor Chem?
On our formula Paramount Peptides scores higher (76 vs 50). The largest gap is in documentation depth (65 vs 0). "Better" depends on what you weight; both fact sheets are on this page.
Do both publish certificates of analysis?
Paramount Peptides: yes. Receptor Chem: yes. Lot-specific certificates — Paramount Peptides: yes; Receptor Chem: not verified.
Which is cheaper?
We could not compare a like-for-like listing; price tiers are mid (Paramount Peptides) and budget (Receptor Chem).