Modern Aminos vs S1Research
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Modern Aminos
- 7.88/10
Modern Aminos
- S1Research
- 7.70/10
S1Research
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Factor by factor
- 8.7Lab Credibilityweight 55%8.6
- 7.0Shipping & Refundweight 20%6.0
- 7.8Pricingweight 15%9.5
- 4.9Operating Historyweight 5%1.8
- 5.5Transparencyweight 5%5.0
- 32Certificates confirmed at the lab29
- 3Labs named on certificates2
Show as a table
| Category | Modern Aminos | S1Research |
|---|---|---|
| Lab Credibility | 8.7 | 8.6 |
| Shipping & Refund | 7.0 | 6.0 |
| Pricing | 7.8 | 9.5 |
| Operating History | 4.9 | 1.8 |
| Transparency | 5.5 | 5.0 |
| Overall | 7.88 | 7.70 |
Products both carry, price for price
| Peptide | Modern Aminosper unit | S1Researchper unit |
|---|---|---|
| BPC-157Guide → | $5.40/mg | $2.00/mg |
| TB-500Guide → | $5.90/mg | $3.60/mg |
| GHK-CuGuide → | $0.64/mg | $0.31/mg |
| IpamorelinGuide → | $6.40/mg | $2.60/mg |
| Semax | $4.20/mg | $3.50/mg |
| Selank | $4.50/mg | $3.50/mg |
| Sermorelin | $7.40/mg | $3.70/mg |
| Tesamorelin | $7.10/mg | $2.35/mg |
| NAD+ | $0.10/mg | $0.06/mg |
| MOTS-c | $2.60/mg | $1.30/mg |
| KPV | $3.90/mg | $3.00/mg |
| PT-141 | $4.10/mg | $2.00/mg |
| AOD-9604 | $7.80/mg | — |
| 5-Amino-1MQ | $1.98/mg | $0.94/mg |
| IGF-1 LR3 | $64.00/mg | — |
| Cagrilintide | $9.90/mg | $4.40/mg |
| CJC-1295 + Ipamorelin | $5.20/mg | $2.70/mg |
How they compare: the verdict
Modern Aminos takes this matchup by a razor-thin margin, 7.88 to 7.70 on the published formula. Its biggest edge is operating history, where it scores 4.9 against S1Research's 1.8.
It isn't a clean sweep. S1Research actually edges ahead on pricing (9.5 vs 7.8), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Modern Aminos and S1Research have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 15 peptides both carry, S1Research is cheaper per unit more often (Modern Aminos wins on 0, S1Research on 15). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Modern Aminos vs S1Research: FAQ
Modern Aminos or S1Research: which is better?
Modern Aminos takes this matchup by a razor-thin margin, 7.88 to 7.70 on the published formula. Its biggest edge is operating history, where it scores 4.9 against S1Research's 1.8. It isn't a clean sweep. S1Research actually edges ahead on pricing (9.5 vs 7.8), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Modern Aminos and S1Research have independently verified third-party COAs, so the gap comes down to the other categories. Across the 15 peptides both carry, S1Research is cheaper per unit more often (Modern Aminos wins on 0, S1Research on 15). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Modern Aminos and S1Research both use third-party testing?
Modern Aminos: independently verified third-party COAs. S1Research: 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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