Prime Peptides vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Prime Peptides
- 7.94/10
Prime Peptides
- Zeptix Labs
- 8.17/10
Zeptix Labs
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
Factor by factor
- 8.6Lab Credibilityweight 55%8.2
- 9.0Shipping & Refundweight 20%10.0
- 6.3Pricingweight 15%8.8
- 3.8Operating Historyweight 5%1.3
- 5.5Transparencyweight 5%5.5
- 20Certificates confirmed at the lab18
- 5Labs named on certificates2
Show as a table
| Category | Prime Peptides | Zeptix Labs |
|---|---|---|
| Lab Credibility | 8.6 | 8.2 |
| Shipping & Refund | 9.0 | 10.0 |
| Pricing | 6.3 | 8.8 |
| Operating History | 3.8 | 1.3 |
| Transparency | 5.5 | 5.5 |
| Overall | 7.94 | 8.17 |
Products both carry, price for price
| Peptide | Prime Peptidesper unit | Zeptix Labsper unit |
|---|---|---|
| BPC-157Guide → | $5.50/mg | $3.00/mg |
| TB-500Guide → | $6.50/mg | $9.50/mg |
| GHK-CuGuide → | $0.60/mg | $0.40/mg |
| IpamorelinGuide → | $6.00/mg | $6.00/mg |
| Melanotan-2 | $4.00/mg | $5.00/mg |
| Sermorelin | $7.00/mg | $7.00/mg |
| Tesamorelin | $8.00/mg | $5.00/mg |
| RetatrutideGuide → | $5.42/mg | $2.67/mg |
| TirzepatideGuide → | $4.33/mg | $3.67/mg |
| SemaglutideGuide → | $7.50/mg | $7.00/mg |
| BPC-157 + TB-500 | $6.25/mg | $5.00/mg |
| Bacteriostatic Water | $2.50/mL | $2.00/mL |
| CJC-1295 + Ipamorelin | $8.00/mg | $8.00/mg |
| MOTS-c | $6.00/mg | $3.00/mg |
| KLOW | $1.81/mg | $0.81/mg |
| GLOW | $1.86/mg | $1.71/mg |
How they compare: the verdict
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.94 on the published formula. Its biggest edge is pricing, where it scores 8.8 against Prime Peptides's 6.3.
It isn't a clean sweep. Prime Peptides actually edges ahead on operating history (3.8 vs 1.3), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Prime Peptides and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 16 peptides both carry, Zeptix Labs is cheaper per unit more often (Prime Peptides wins on 2, Zeptix Labs on 13). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
Prime Peptides vs Zeptix Labs: FAQ
Prime Peptides or Zeptix Labs: which is better?
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.94 on the published formula. Its biggest edge is pricing, where it scores 8.8 against Prime Peptides's 6.3. It isn't a clean sweep. Prime Peptides actually edges ahead on operating history (3.8 vs 1.3), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Prime Peptides and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 16 peptides both carry, Zeptix Labs is cheaper per unit more often (Prime Peptides wins on 2, Zeptix Labs on 13). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Prime Peptides and Zeptix Labs both use third-party testing?
Prime Peptides: independently verified third-party COAs. Zeptix Labs: independently verified third-party COAs.
How was this comparison scored?
Both vendors are scored on the identical published formula: lab credibility 55%, shipping 20%, pricing 15%, operating history 5%, transparency 5%. When third-party testing cannot be independently verified, a testing gate holds the score under a cap that starts at 6.0 and rises by at most 2.5 points for operating history, shipping and reviews. Neither vendor can pay to change a score.
More comparisons
Other head-to-heads featuring Prime Peptides or Zeptix Labs.