S1Research vs Transition Biotech
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- S1Research
- 7.70/10
S1Research
- Transition Biotech
- 7.98/10
Transition Biotech
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Factor by factor
- 8.6Lab Credibilityweight 55%9.2
- 6.0Shipping & Refundweight 20%6.0
- 9.5Pricingweight 15%9.5
- 1.8Operating Historyweight 5%1.8
- 5.0Transparencyweight 5%4.0
- 29Certificates confirmed at the lab10
- 2Labs named on certificates1
Show as a table
| Category | S1Research | Transition Biotech |
|---|---|---|
| Lab Credibility | 8.6 | 9.2 |
| Shipping & Refund | 6.0 | 6.0 |
| Pricing | 9.5 | 9.5 |
| Operating History | 1.8 | 1.8 |
| Transparency | 5.0 | 4.0 |
| Overall | 7.70 | 7.98 |
Products both carry, price for price
| Peptide | S1Researchper unit | Transition Biotechper unit |
|---|---|---|
| BPC-157Guide → | $2.00/mg | $3.50/mg |
| GHK-CuGuide → | $0.31/mg | $0.30/mg |
| IpamorelinGuide → | $2.60/mg | $3.50/mg |
| NAD+ | $0.06/mg | $0.07/mg |
| RetatrutideGuide → | $1.50/mg | $3.50/mg |
| TB-500Guide → | $3.60/mg | $4.50/mg |
| BPC-157 + TB-500 | $2.50/mg | $2.75/mg |
| TirzepatideGuide → | $1.00/mg | $1.33/mg |
How they compare: the verdict
Transition Biotech takes this matchup by a razor-thin margin, 7.98 to 7.70 on the published formula. Its biggest edge is lab credibility, where it scores 9.2 against S1Research's 8.6.
It isn't a clean sweep. S1Research actually edges ahead on transparency (5.0 vs 4.0), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both S1Research and Transition Biotech have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 8 peptides both carry, S1Research is cheaper per unit more often (S1Research wins on 7, Transition Biotech on 1). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
S1Research vs Transition Biotech: FAQ
S1Research or Transition Biotech: which is better?
Transition Biotech takes this matchup by a razor-thin margin, 7.98 to 7.70 on the published formula. Its biggest edge is lab credibility, where it scores 9.2 against S1Research's 8.6. It isn't a clean sweep. S1Research actually edges ahead on transparency (5.0 vs 4.0), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both S1Research and Transition Biotech have independently verified third-party COAs, so the gap comes down to the other categories. Across the 8 peptides both carry, S1Research is cheaper per unit more often (S1Research wins on 7, Transition Biotech on 1). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do S1Research and Transition Biotech both use third-party testing?
S1Research: independently verified third-party COAs. Transition Biotech: 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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