Loti Labs vs S1Research
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Loti Labs
- 7.68/10
Loti Labs
- S1Research
- 7.75/10
S1Research
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Factor by factor
- 8.2Lab Credibilityweight 55%8.7
- 8.5Shipping & Refundweight 20%6.0
- 6.4Pricingweight 15%9.5
- 7.2Operating Historyweight 5%1.8
- 3.0Transparencyweight 5%5.0
- 24Certificates confirmed at the lab29
- 2Labs named on certificates2
Show as a table
| Category | Loti Labs | S1Research |
|---|---|---|
| Lab Credibility | 8.2 | 8.7 |
| Shipping & Refund | 8.5 | 6.0 |
| Pricing | 6.4 | 9.5 |
| Operating History | 7.2 | 1.8 |
| Transparency | 3.0 | 5.0 |
| Overall | 7.68 | 7.75 |
Products both carry, price for price
| Peptide | Loti Labsper unit | S1Researchper unit |
|---|---|---|
| BPC-157Guide → | $10.00/mg | $2.00/mg |
| TB-500Guide → | $9.00/mg | $3.60/mg |
| GHK-CuGuide → | $1.00/mg | $0.31/mg |
| IpamorelinGuide → | $12.49/mg | $2.60/mg |
| Semax | $8.00/mg | $3.50/mg |
| Selank | $5.00/mg | $3.50/mg |
| Sermorelin | $14.99/mg | $3.70/mg |
| Tesamorelin | $8.00/mg | $2.35/mg |
| RetatrutideGuide → | $10.00/mg | $1.50/mg |
| TirzepatideGuide → | $5.80/mg | $1.00/mg |
| SemaglutideGuide → | $16.00/mg | $1.50/mg |
| PT-141 | $4.00/mg | $2.00/mg |
| AOD-9604 | $10.00/mg | — |
| 5-Amino-1MQ | $5.00/mg | $0.94/mg |
| IGF-1 LR3 | $79.99/mg | — |
| Cagrilintide | $18.00/mg | $4.40/mg |
| CJC-1295 + Ipamorelin | $7.50/mg | $2.70/mg |
How they compare: the verdict
S1Research takes this matchup by a razor-thin margin, 7.75 to 7.68 on the published formula. Its biggest edge is pricing, where it scores 9.5 against Loti Labs's 6.4.
It isn't a clean sweep. Loti Labs actually edges ahead on operating history (7.2 vs 1.8), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Loti Labs 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 (Loti Labs 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).
Loti Labs vs S1Research: FAQ
Loti Labs or S1Research: which is better?
S1Research takes this matchup by a razor-thin margin, 7.75 to 7.68 on the published formula. Its biggest edge is pricing, where it scores 9.5 against Loti Labs's 6.4. It isn't a clean sweep. Loti Labs actually edges ahead on operating history (7.2 vs 1.8), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Loti Labs 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 (Loti Labs 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 Loti Labs and S1Research both use third-party testing?
Loti Labs: 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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