LabFirst Peptides vs S1Research
Two top US peptide sources scored on the identical published formula: lab credibility, shipping, pricing, operating history, and transparency.
- LabFirst Peptides
- 7.73/10
LabFirst Peptides
- S1Research
- 7.75/10
S1Research
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
Factor by factor
- 8.9Lab Credibilityweight 55%8.7
- 7.5Shipping & Refundweight 20%6.0
- 6.3Pricingweight 15%9.5
- 0.7Operating Historyweight 5%1.8
- 7.0Transparencyweight 5%5.0
- 26Certificates confirmed at the lab29
- 1Labs named on certificates2
Show as a table
| Category | LabFirst Peptides | S1Research |
|---|---|---|
| Lab Credibility | 8.9 | 8.7 |
| Shipping & Refund | 7.5 | 6.0 |
| Pricing | 6.3 | 9.5 |
| Operating History | 0.7 | 1.8 |
| Transparency | 7.0 | 5.0 |
| Overall | 7.73 | 7.75 |
Products both carry, price for price
| Peptide | LabFirst Peptidesper unit | S1Researchper unit |
|---|---|---|
| AOD-9604 | $7.50/mg | — |
| BPC-157 + TB-500 | $4.50/mg | $2.50/mg |
| BPC-157Guide → | $5.90/mg | $2.00/mg |
| CJC-1295 + Ipamorelin | $6.75/mg | $2.70/mg |
| DSIP | $5.40/mg | $2.20/mg |
| Epitalon | $2.18/mg | $2.50/mg |
| GHK-CuGuide → | $0.59/mg | $0.31/mg |
| GLOW | $1.86/mg | $0.60/mg |
| IpamorelinGuide → | $6.50/mg | $2.60/mg |
| KLOW | $1.69/mg | $0.62/mg |
| KPV | $4.90/mg | $3.00/mg |
| MOTS-c | $3.75/mg | $1.30/mg |
| NAD+ | $0.16/mg | $0.06/mg |
| PT-141 | $4.00/mg | $2.00/mg |
| RetatrutideGuide → | $3.57/mg | $1.50/mg |
| Selank | $2.63/mg | $3.50/mg |
| SemaglutideGuide → | $5.50/mg | $1.50/mg |
| Semax | $2.30/mg | $3.50/mg |
| SS-31 | $4.18/mg | $1.66/mg |
| Tesamorelin | $7.50/mg | $2.35/mg |
| Thymosin Alpha-1 | $13.00/mg | $3.85/mg |
| TirzepatideGuide → | $3.83/mg | $1.00/mg |
How they compare: the verdict
S1Research takes this matchup by a razor-thin margin, 7.75 to 7.73 on the published formula. Its biggest edge is pricing, where it scores 9.5 against LabFirst Peptides's 6.3.
It isn't a clean sweep. LabFirst Peptides actually edges ahead on transparency (7.0 vs 5.0), so if that factor matters most to you it's worth weighing.
On lab evidence, the heaviest-weighted factor, both LabFirst Peptides and S1Research have independently verified third-party COAs, so the gap comes down to the other categories.
Across the 21 peptides both carry, S1Research is cheaper per unit more often (LabFirst Peptides wins on 3, S1Research on 18). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Affiliate links: we may earn a commission if you buy. It never changes a score or rank.
LabFirst Peptides vs S1Research: FAQ
LabFirst Peptides or S1Research: which is better?
S1Research takes this matchup by a razor-thin margin, 7.75 to 7.73 on the published formula. Its biggest edge is pricing, where it scores 9.5 against LabFirst Peptides's 6.3. It isn't a clean sweep. LabFirst Peptides actually edges ahead on transparency (7.0 vs 5.0), so if that factor matters most to you it's worth weighing. On lab evidence, the heaviest-weighted factor, both LabFirst Peptides and S1Research have independently verified third-party COAs, so the gap comes down to the other categories. Across the 21 peptides both carry, S1Research is cheaper per unit more often (LabFirst Peptides wins on 3, S1Research on 18). The price-for-price table below has the detail, per mg (or per IU or mL for products sold that way).
Do LabFirst Peptides and S1Research both use third-party testing?
LabFirst Peptides: 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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