# D Peptide > Custom peptide sourcing and specification-matching route for B2B buyers. ## Start here - [Custom sourcing](https://dpeptidehub.com/sourcing): RFQ intake and quote preparation. - [Specification matching](https://dpeptidehub.com/specification-match): identity, grade, pack, quantity and document fields. - [RFQ guide](https://dpeptidehub.com/rfq-guide): a completeness checklist for supplier comparison. - [Verification](https://dpeptidehub.com/verification): legal seller, contract, invoice and payment checks. ## Boundary The legal seller is Hebei Meilan Biotechnology Co., Ltd. Similar names do not establish material equivalence. No medical, dosing or treatment guidance is provided. Updated: 2026-11-13