Southern Aminos vs Zeptix Labs
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Southern Aminos
- 8.09/10
Southern Aminos
- Zeptix Labs
- 8.17/10
Zeptix Labs
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Factor by factor
- 9.0Lab Credibilityweight 55%8.2
- 7.5Shipping & Refundweight 20%10.0
- 8.5Pricingweight 15%8.8
- 2.3Operating Historyweight 5%1.3
- 5.0Transparencyweight 5%5.5
- 28Certificates confirmed at the lab18
- 2Labs named on certificates2
Show as a table
| Category | Southern Aminos | Zeptix Labs |
|---|---|---|
| Lab Credibility | 9.0 | 8.2 |
| Shipping & Refund | 7.5 | 10.0 |
| Pricing | 8.5 | 8.8 |
| Operating History | 2.3 | 1.3 |
| Transparency | 5.0 | 5.5 |
| Overall | 8.09 | 8.17 |
Products both carry, price for price
| Peptide | Southern Aminosper unit | Zeptix Labsper unit |
|---|---|---|
| BPC-157Guide → | $3.84/mg | $3.00/mg |
| BPC-157 + TB-500 | $3.96/mg | $5.00/mg |
| Cagrilintide | $11.92/mg | $10.00/mg |
| Epitalon | $3.60/mg | $3.00/mg |
| GHK-CuGuide → | $0.40/mg | $0.40/mg |
| GLOW | $1.13/mg | $1.71/mg |
| IpamorelinGuide → | $4.80/mg | $6.00/mg |
| KLOW | $1.20/mg | $0.81/mg |
| MOTS-c | $1.98/mg | $3.00/mg |
| Melanotan-2 | $4.16/mg | $5.00/mg |
| PT-141 | $4.40/mg | $4.50/mg |
| RetatrutideGuide → | $1.84/mg | $2.67/mg |
| TB-500Guide → | $4.80/mg | $9.50/mg |
| Tesamorelin | $3.96/mg | $5.00/mg |
| TirzepatideGuide → | $2.07/mg | $3.67/mg |
How they compare: the verdict
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 8.09 on the published formula. Its biggest edge is shipping & refunds, where it scores 10.0 against Southern Aminos's 7.5.
It isn't a clean sweep. Southern Aminos actually edges ahead on operating history (2.3 vs 1.3), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Southern Aminos and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 15 peptides both carry, Southern Aminos is cheaper per unit more often (Southern Aminos wins on 10, 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.
Southern Aminos vs Zeptix Labs: FAQ
Southern Aminos or Zeptix Labs: which is better?
Zeptix Labs takes this matchup by a razor-thin margin, 8.17 to 8.09 on the published formula. Its biggest edge is shipping & refunds, where it scores 10.0 against Southern Aminos's 7.5. It isn't a clean sweep. Southern Aminos actually edges ahead on operating history (2.3 vs 1.3), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Southern Aminos and Zeptix Labs have independently verified third-party COAs, so the gap comes down to the other categories. Across the 15 peptides both carry, Southern Aminos is cheaper per unit more often (Southern Aminos wins on 10, 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 Southern Aminos and Zeptix Labs both use third-party testing?
Southern Aminos: 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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