Loti Labs vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Loti Labs
- 7.79/10
Loti Labs
- Zeptix Labs
- 8.17/10
Zeptix Labs
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Factor by factor
- 8.4Lab Credibilityweight 55%8.2
- 8.5Shipping & Refundweight 20%10.0
- 6.4Pricingweight 15%8.8
- 7.2Operating Historyweight 5%1.3
- 3.0Transparencyweight 5%5.5
- 24Certificates confirmed at the lab18
- 2Labs named on certificates2
Show as a table
| Category | Loti Labs | Zeptix Labs |
|---|---|---|
| Lab Credibility | 8.4 | 8.2 |
| Shipping & Refund | 8.5 | 10.0 |
| Pricing | 6.4 | 8.8 |
| Operating History | 7.2 | 1.3 |
| Transparency | 3.0 | 5.5 |
| Overall | 7.79 | 8.17 |
Products both carry, price for price
| Peptide | Loti Labsper unit | Zeptix Labsper unit |
|---|---|---|
| BPC-157Guide → | $10.00/mg | $3.00/mg |
| TB-500Guide → | $9.00/mg | $9.50/mg |
| GHK-CuGuide → | $1.00/mg | $0.40/mg |
| IpamorelinGuide → | $12.49/mg | $6.00/mg |
| Melanotan-2 | $4.00/mg | $5.00/mg |
| Sermorelin | $14.99/mg | $7.00/mg |
| Tesamorelin | $8.00/mg | $5.00/mg |
| RetatrutideGuide → | $10.00/mg | $2.67/mg |
| TirzepatideGuide → | $5.80/mg | $3.67/mg |
| SemaglutideGuide → | $16.00/mg | $7.00/mg |
| PT-141 | $4.00/mg | $4.50/mg |
| Cagrilintide | $18.00/mg | $10.00/mg |
| CJC-1295 + Ipamorelin | $7.50/mg | $8.00/mg |
How they compare: the verdict
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.79 on the published formula. Its biggest edge is transparency, where it scores 5.5 against Loti Labs's 3.0.
It isn't a clean sweep. Loti Labs actually edges ahead on operating history (7.2 vs 1.3), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Loti Labs and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 13 peptides both carry, Zeptix Labs is cheaper per unit more often (Loti Labs wins on 4, Zeptix Labs on 9). 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.
Loti Labs vs Zeptix Labs: FAQ
Loti Labs or Zeptix Labs: which is better?
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.79 on the published formula. Its biggest edge is transparency, where it scores 5.5 against Loti Labs's 3.0. It isn't a clean sweep. Loti Labs actually edges ahead on operating history (7.2 vs 1.3), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Loti Labs and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 13 peptides both carry, Zeptix Labs is cheaper per unit more often (Loti Labs wins on 4, Zeptix Labs on 9). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Loti Labs and Zeptix Labs both use third-party testing?
Loti Labs: 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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