Best for: Laboratories and biotech companies
Best for: Clinics, brands, and distributors
Best for: Biotech and university researchers
Best for: Custom peptide researchers
Best for: Research laboratories and distributors
Best for: Laboratories and research institutions
Every supplier on this page is ranked by its Peptide Ad Lab score. Where less has been verified, the score is pulled toward the baseline, never up.
A quick side-by-side of the #1 position against other suppliers based in the EU, using the same verified criteria we apply to every supplier. Full evidence and sources are on each company profile.
| NeuroPept Ltd | Peptide Direct | |
|---|---|---|
| Location | Rotterdam, Netherlands | Gloucester, UK and Berlin, Germany |
| Testing checks | 6 of 7 | 3 of 7 |
| Wholesale | Not confirmed | Yes |
| PAL score | 8.8/10 | 8.7/10 |
| NeuroPept Ltd | Schafer-N ApS | |
|---|---|---|
| Location | Rotterdam, Netherlands | Copenhagen, Denmark |
| Testing checks | 6 of 7 | 1 of 7 |
| Wholesale | Not confirmed | Not confirmed |
| PAL score | 8.8/10 | 8.1/10 |
| NeuroPept Ltd | BIOSYNTAN GmbH | |
|---|---|---|
| Location | Rotterdam, Netherlands | Berlin, Germany |
| Testing checks | 6 of 7 | 0 of 7 |
| Wholesale | Not confirmed | Not confirmed |
| PAL score | 8.8/10 | 8.0/10 |
| NeuroPept Ltd | Pen Peptide | |
|---|---|---|
| Location | Rotterdam, Netherlands | Plovdiv, Bulgaria |
| Testing checks | 6 of 7 | 0 of 7 |
| Wholesale | Not confirmed | Yes |
| PAL score | 8.8/10 | 8.0/10 |
Ordered by Peptide Ad Lab score.
| # | Supplier | Based in | COAs / testing | Wholesale | Score | |
|---|---|---|---|---|---|---|
| 1 | NeuroPept Ltd | Rotterdam, Netherlands | Yes | Not confirmed | 8.8 | Profile |
| 2 | Peptide Direct | Gloucester, UK and Berlin, Germany | Yes | Yes | 8.7 | Profile |
| 3 | Schafer-N ApS | Copenhagen, Denmark | Yes | Not confirmed | 8.1 | Profile |
| 4 | BIOSYNTAN GmbH | Berlin, Germany | Not confirmed | Not confirmed | 8.0 | Profile |
| 5 | Pen Peptide | Plovdiv, Bulgaria | Not confirmed | Yes | 8.0 | Profile |
| 6 | CASLO ApS | Kongens Lyngby, Denmark | Yes | Not confirmed | 7.9 | Profile |
Methodology
Every supplier is scored on the same seven dimensions, and the overall score is calculated from those dimensions — it is never assigned by hand. Where a supplier has not published something, we record it as not confirmed: an information gap is excluded from the calculation rather than scored as a zero, and we never infer a capability a company has not stated.
House weighting: testing and transparency carry the most weight for research and business buyers.
Each supplier is assessed against a published set of criteria covering business transparency, testing and documentation, wholesale capabilities, manufacturing capabilities, website experience, commercial purchasing and fulfillment. Assessments use publicly available information: the company's own website, published documentation, and publicly stated programs. Where something cannot be confirmed, it is shown as not confirmed rather than counted against the supplier.
Suppliers can purchase sponsored visibility, such as a featured placement on a comparison page or a sponsored position on a comparison page. Those placements are always clearly labelled as sponsored. Payment does not create, change or influence a Peptide Ad Lab editorial score. Where a comparison page includes a sponsored position, it carries a visible "Sponsored placement" label, and every other position on the page follows editorial score order.