S1Research vs Southern Aminos
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- S1Research
- 7.70/10
S1Research
- Southern Aminos
- 8.09/10
Southern Aminos
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Factor by factor
- 8.6Lab Credibilityweight 55%9.0
- 6.0Shipping & Refundweight 20%7.5
- 9.5Pricingweight 15%8.5
- 1.8Operating Historyweight 5%2.3
- 5.0Transparencyweight 5%5.0
- 29Certificates confirmed at the lab28
- 2Labs named on certificates2
Show as a table
| Category | S1Research | Southern Aminos |
|---|---|---|
| Lab Credibility | 8.6 | 9.0 |
| Shipping & Refund | 6.0 | 7.5 |
| Pricing | 9.5 | 8.5 |
| Operating History | 1.8 | 2.3 |
| Transparency | 5.0 | 5.0 |
| Overall | 7.70 | 8.09 |
Products both carry, price for price
| Peptide | S1Researchper unit | Southern Aminosper unit |
|---|---|---|
| 5-Amino-1MQ | $0.94/mg | $1.60/mg |
| AOD-9604 | — | $8.80/mg |
| BPC-157Guide → | $2.00/mg | $3.84/mg |
| Cagrilintide | $4.40/mg | $11.92/mg |
| DSIP | $2.20/mg | $7.20/mg |
| Epitalon | $2.50/mg | $3.60/mg |
| GHK-CuGuide → | $0.31/mg | $0.40/mg |
| GLOW | $0.60/mg | $1.13/mg |
| Glutathione | $0.02/mg | $0.03/mg |
| IGF-1 LR3 | — | $60.00/mg |
| IpamorelinGuide → | $2.60/mg | $4.80/mg |
| KLOW | $0.62/mg | $1.20/mg |
| KPV | $3.00/mg | $4.00/mg |
| MOTS-c | $1.30/mg | $1.98/mg |
| NAD+ | $0.06/mg | $0.08/mg |
| PT-141 | $2.00/mg | $4.40/mg |
| RetatrutideGuide → | $1.50/mg | $1.84/mg |
| Selank | $3.50/mg | $3.52/mg |
| Semax | $3.50/mg | $3.52/mg |
| SS-31 | $1.66/mg | $5.52/mg |
| TB-500Guide → | $3.60/mg | $4.80/mg |
| BPC-157 + TB-500 | $2.50/mg | $3.96/mg |
| Tesamorelin | $2.35/mg | $3.96/mg |
| Thymosin Alpha-1 | $3.85/mg | $6.00/mg |
| TirzepatideGuide → | $1.00/mg | $2.07/mg |
How they compare: the verdict
Southern Aminos takes this matchup by a razor-thin margin, 8.09 to 7.70 on the published formula. Its biggest edge is shipping & refunds, where it scores 7.5 against S1Research's 6.0.
It isn't a clean sweep. S1Research actually edges ahead on pricing (9.5 vs 8.5), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both S1Research and Southern Aminos have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 23 peptides both carry, S1Research is cheaper per unit more often (S1Research wins on 23, Southern Aminos on 0). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
S1Research vs Southern Aminos: FAQ
S1Research or Southern Aminos: which is better?
Southern Aminos takes this matchup by a razor-thin margin, 8.09 to 7.70 on the published formula. Its biggest edge is shipping & refunds, where it scores 7.5 against S1Research's 6.0. It isn't a clean sweep. S1Research actually edges ahead on pricing (9.5 vs 8.5), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both S1Research and Southern Aminos have independently verified third-party COAs, so the gap comes down to the other categories. Across the 23 peptides both carry, S1Research is cheaper per unit more often (S1Research wins on 23, Southern Aminos on 0). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do S1Research and Southern Aminos both use third-party testing?
S1Research: independently verified third-party COAs. Southern Aminos: 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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