Amino USA vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Amino USA
- 7.78/10
Amino USA
- Zeptix Labs
- 8.17/10
Zeptix Labs
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Factor by factor
- 8.0Lab Credibilityweight 55%8.2
- 8.0Shipping & Refundweight 20%10.0
- 8.3Pricingweight 15%8.8
- 4.2Operating Historyweight 5%1.3
- 6.5Transparencyweight 5%5.5
- 19Certificates confirmed at the lab18
- 2Labs named on certificates2
Show as a table
| Category | Amino USA | Zeptix Labs |
|---|---|---|
| Lab Credibility | 8.0 | 8.2 |
| Shipping & Refund | 8.0 | 10.0 |
| Pricing | 8.3 | 8.8 |
| Operating History | 4.2 | 1.3 |
| Transparency | 6.5 | 5.5 |
| Overall | 7.78 | 8.17 |
Products both carry, price for price
| Peptide | Amino USAper unit | Zeptix Labsper unit |
|---|---|---|
| BPC-157Guide → | $5.67/mg | $3.00/mg |
| TB-500Guide → | $8.00/mg | $9.50/mg |
| GHK-CuGuide → | $0.50/mg | $0.40/mg |
| IpamorelinGuide → | $5.00/mg | $6.00/mg |
| Melanotan-2 | $3.00/mg | $5.00/mg |
| Sermorelin | $6.67/mg | $7.00/mg |
| Tesamorelin | $9.00/mg | $5.00/mg |
| PT-141 | $4.50/mg | $4.50/mg |
| Cagrilintide | $10.20/mg | $10.00/mg |
How they compare: the verdict
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.78 on the published formula. Its biggest edge is shipping & refunds, where it scores 10.0 against Amino USA's 8.0.
It isn't a clean sweep. Amino USA actually edges ahead on operating history (4.2 vs 1.3), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Amino USA and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 9 peptides both carry, Zeptix Labs is cheaper per unit more often (Amino USA wins on 4, Zeptix Labs on 5). 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.
Amino USA vs Zeptix Labs: FAQ
Amino USA or Zeptix Labs: which is better?
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 7.78 on the published formula. Its biggest edge is shipping & refunds, where it scores 10.0 against Amino USA's 8.0. It isn't a clean sweep. Amino USA actually edges ahead on operating history (4.2 vs 1.3), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Amino USA and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 9 peptides both carry, Zeptix Labs is cheaper per unit more often (Amino USA wins on 4, Zeptix Labs on 5). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Amino USA and Zeptix Labs both use third-party testing?
Amino 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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