Protide Health vs S1Research
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- Protide Health
- 7.67/10
Protide Health
- S1Research
- 7.70/10
S1Research
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Factor by factor
- 9.1Lab Credibilityweight 55%8.6
- 7.0Shipping & Refundweight 20%6.0
- 5.4Pricingweight 15%9.5
- 3.0Operating Historyweight 5%1.8
- 6.0Transparencyweight 5%5.0
- 22Certificates confirmed at the lab29
- 1Labs named on certificates2
Show as a table
| Category | Protide Health | S1Research |
|---|---|---|
| Lab Credibility | 9.1 | 8.6 |
| Shipping & Refund | 7.0 | 6.0 |
| Pricing | 5.4 | 9.5 |
| Operating History | 3.0 | 1.8 |
| Transparency | 6.0 | 5.0 |
| Overall | 7.67 | 7.70 |
Products both carry, price for price
| Peptide | Protide Healthper unit | S1Researchper unit |
|---|---|---|
| BPC-157Guide → | $4.88/mg | $2.00/mg |
| TB-500Guide → | $8.50/mg | $3.60/mg |
| GHK-CuGuide → | $0.65/mg | $0.31/mg |
| IpamorelinGuide → | $7.50/mg | $2.60/mg |
| Semax | $6.00/mg | $3.50/mg |
| Selank | $6.50/mg | $3.50/mg |
| Sermorelin | $10.50/mg | $3.70/mg |
| Tesamorelin | $7.00/mg | $2.35/mg |
| RetatrutideGuide → | $5.50/mg | $1.50/mg |
| TirzepatideGuide → | $6.67/mg | $1.00/mg |
| PT-141 | $5.50/mg | $2.00/mg |
| AOD-9604 | $12.00/mg | — |
| 5-Amino-1MQ | $2.20/mg | $0.94/mg |
| IGF-1 LR3 | $85.00/mg | — |
| Cagrilintide | $15.50/mg | $4.40/mg |
| AHK-Cu | $0.95/mg | $0.04/mg |
How they compare: the verdict
S1Research takes this matchup by a razor-thin margin, 7.70 to 7.67 on the published formula. Its biggest edge is pricing, where it scores 9.5 against Protide Health's 5.4.
It isn't a clean sweep. Protide Health actually edges ahead on operating history (3.0 vs 1.8), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both Protide Health and S1Research have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 14 peptides both carry, S1Research is cheaper per unit more often (Protide Health wins on 0, S1Research on 14). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Protide Health vs S1Research: FAQ
Protide Health or S1Research: which is better?
S1Research takes this matchup by a razor-thin margin, 7.70 to 7.67 on the published formula. Its biggest edge is pricing, where it scores 9.5 against Protide Health's 5.4. It isn't a clean sweep. Protide Health actually edges ahead on operating history (3.0 vs 1.8), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both Protide Health and S1Research have independently verified third-party COAs, so the gap comes down to the other categories. Across the 14 peptides both carry, S1Research is cheaper per unit more often (Protide Health wins on 0, S1Research on 14). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do Protide Health and S1Research both use third-party testing?
Protide Health: 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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