
Synthlink
Quality & Guarantee
Built for Research You Can Trust
We do not manufacture peptides ourselves — and that's exactly why we can be so rigorous. We partner only with ISO-certified facilities in China and apply our own multi-layer verification process to every single order. Your research deserves reproducibility and reliability.
Our Guarantee – Resynthesis or Full Refund
If the delivered peptide does not meet the agreed purity specification (as confirmed by HPLC/MS), we will:
- Resynthesize at no cost to you, or
- Issue a full refund for that order
This guarantee covers purity only. Modifications, quantity, and delivery timelines are covered under separate terms. Contact us for complete details.
Why We Can Offer This Guarantee
Because we vet every supplier, verify every CoA, and test every batch before shipping. If something goes wrong, we make it right — without excuses.
Our Quality Verification Process

Pre-synthesis review
We assess sequence difficulty, identify potential challenges (aggregation, low solubility, difficult couplings), and propose solutions before synthesis begins.

In-process checks
We monitor critical steps and request intermediate QC data for long or difficult sequences.

Final QC before shipping
Every batch is tested by HPLC (purity) and MS (identity). CoA is generated and reviewed by us before we authorize shipping.

Optional third-party validation
For an additional fee, we can send a sample to an independent lab for blind purity testing. You receive an unbiased report.
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