Deep Comparisons
Looking for a specific head-to-head or vendor-replacement guide? Jump straight to the detail page.
A factual side-by-side of how DelixLabs compares to Peptide Sciences, Core Peptides, Restore Peptides, and Swiss Chems on the metrics that actually matter in a research setting: independent purity verification, batch transparency, fulfillment speed, and operational stability.
Browse research catalog →The four metrics that matter
Most “best peptide vendor” lists rank by traffic or affiliate revenue. For laboratory work, the only metrics that decide reorders are independent verification, batch-to-batch consistency, fulfillment reliability, and whether the company still exists next quarter. Here is how the field looks today.
Side-by-side
Why independent verification changes everything
An in-house Certificate of Analysis is signed by the same company selling the product. There is no external check. For research that needs to be reproducible — especially when batch consistency affects downstream assay results — that creates a single point of failure.
DelixLabs ships every batch with a verification key tied to a report at janoshik.com, an independent analytical lab we do not own or control. The report is hosted on their server. The signature is theirs. If a batch does not clear 99% HPLC purity, it does not leave our facility.
Why the Peptide Sciences shutdown matters for everyone else
Peptide Sciences was a category leader for years. Its March 2026 closure removed a major supply node and concentrated demand across remaining US vendors. Researchers who relied on a single supplier are now actively diversifying. The question to ask any replacement is not “do you sell the compound” — it is “what is your continuity plan and where does your test data come from.”
Who DelixLabs is for
- Independent labs and research facilities that need batch-level documentation
- Researchers who require reproducibility across orders
- US-based buyers who need same-day fulfillment without international customs risk
- Anyone replacing a discontinued supplier and unwilling to repeat the same lock-in
Who we are not for
- International buyers — we ship US-only
- Human or veterinary use — research only, in vitro
- Bulk pharma-scale orders (GMP-compliant manufacturers like Bachem fit that need)
Next steps
If you want to verify what we ship before ordering, every recent batch test is published at delixlabs.com/coas-test-results. Each one carries a Janoshik task number you can verify on janoshik.com directly. No login required, no email gate.
Browse research catalog →