Peptix USA vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Peptix USA
- 8.11/10
Peptix USA
- Zeptix Labs
- 8.17/10
Zeptix Labs
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Factor by factor
- 8.6Lab Credibilityweight 55%8.2
- 9.0Shipping & Refundweight 20%10.0
- 8.9Pricingweight 15%8.8
- 1.3Operating Historyweight 5%1.3
- 3.5Transparencyweight 5%5.5
- 5Certificates confirmed at the lab18
- 2Labs named on certificates2
Show as a table
| Category | Peptix USA | Zeptix Labs |
|---|---|---|
| Lab Credibility | 8.6 | 8.2 |
| Shipping & Refund | 9.0 | 10.0 |
| Pricing | 8.9 | 8.8 |
| Operating History | 1.3 | 1.3 |
| Transparency | 3.5 | 5.5 |
| Overall | 8.11 | 8.17 |
Products both carry, price for price
| Peptide | Peptix USAper unit | Zeptix Labsper unit |
|---|---|---|
| BPC-157Guide → | $4.00/mg | $3.00/mg |
| GLOW | $1.21/mg | $1.71/mg |
| RetatrutideGuide → | $5.90/mg | $2.67/mg |
| Tesamorelin | $6.20/mg | $5.00/mg |
| TirzepatideGuide → | $2.90/mg | $3.67/mg |
How they compare: the verdict
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 8.11 on the published formula. Its biggest edge is transparency, where it scores 5.5 against Peptix USA's 3.5.
It isn't a clean sweep. Peptix USA actually edges ahead on lab credibility (8.6 vs 8.2), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Peptix USA and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 5 peptides both carry, Zeptix Labs is cheaper per unit more often (Peptix USA wins on 2, Zeptix Labs on 3). 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.
Peptix USA vs Zeptix Labs: FAQ
Peptix USA or Zeptix Labs: which is better?
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 8.11 on the published formula. Its biggest edge is transparency, where it scores 5.5 against Peptix USA's 3.5. It isn't a clean sweep. Peptix USA actually edges ahead on lab credibility (8.6 vs 8.2), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Peptix USA and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 5 peptides both carry, Zeptix Labs is cheaper per unit more often (Peptix USA wins on 2, Zeptix Labs on 3). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Peptix USA and Zeptix Labs both use third-party testing?
Peptix USA: 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.
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