Why This Checklist Exists
The wholesale peptide API market has a documentation problem. A significant portion of the "US-manufactured" peptides being sold to compounding pharmacies are either synthesized overseas and relabeled, produced domestically but without appropriate quality controls, or supplied with CoA documentation that is generic, undated, or not lot-specific. For a 503A pharmacy director, purchasing from a non-compliant supplier creates regulatory exposure, patient safety risk, and liability. This checklist is designed to filter out non-compliant suppliers before you commit to a purchase.
Section 1: Manufacturing Verification (Items 1–5)
- Can they provide the physical address of the manufacturing facility? A legitimate domestic manufacturer will provide this immediately. If the answer is vague ("our partner facility in the US"), ask for specifics.
- Can they provide the FDA facility registration number? US drug manufacturers are required to register with FDA. The registration can be verified at accessdata.fda.gov. If no registration number is provided, the manufacturing claim is unverified.
- Is the cleanroom classification documented? Injectable-grade peptide synthesis requires at minimum an ISO 5 (Class 100) environment. Ask for the facility's cleanroom classification certification.
- Are cGMP procedures in place? Ask whether they operate under current Good Manufacturing Practice guidelines and whether batch records are maintained. A yes/no question — legitimate operations will confirm yes without hesitation.
- Does the manufacturing facility appear on the CoA? The Certificate of Analysis should identify where the product was manufactured, not just the distributor's name. If the CoA only shows the distributor, ask for the original manufacturer's documentation.
Section 2: Documentation Requirements (Items 6–12)
- Is the CoA lot-specific? Every CoA should reference a unique lot number. Generic or undated CoA documents that apply to "all lots" of a product are non-compliant and should not be accepted.
- Does the CoA include an HPLC chromatogram? Not just a purity percentage — the actual chromatogram with integration report. A number without supporting data is unverifiable.
- Is purity ≥99% by HPLC? USP peptide monographs and 503A pharmacy practice standards generally require ≥99% purity for peptide API. Anything below 98% should prompt further investigation.
- Does the CoA include mass spectrometry confirmation? MS data confirms the molecular weight and sequence identity of the peptide. Without it, there is no confirmation that the material is the peptide it claims to be.
- Does the CoA include endotoxin test results? For any peptide intended for injection, endotoxin testing is essential. Ask for LAL (Limulus Amebocyte Lysate) test results with the threshold value and result. Standard target is <1 EU/mg.
- Does the CoA include residual solvent analysis? SPPS peptide synthesis uses organic solvents (DMF, DCM, acetonitrile). Residual solvent profiling per ICH Q3C is required for pharmaceutical-grade material.
- Can they provide a supplier letter? A letter on company letterhead identifying the manufacturer, their DMF number (where applicable), and confirming the material's regulatory standing for 503A sourcing purposes.
Section 3: Raw Material Sourcing (Items 13–16)
- Where is the raw API (amino acids and reagents) sourced? Even US-manufactured peptides can contain overseas raw materials. Ask whether raw materials are from FDA-recognized sources.
- Is the raw API supplier on the FDA Green List? The FDA Green List (formally the 503B bulk drug substance evaluation list) provides a benchmark for suppliers with FDA-recognized regulatory standing.
- Is a raw material CoA available? Can the supplier provide a CoA for the raw amino acids and coupling reagents used in synthesis? This traceability is important for full supply chain documentation.
- Is there a Drug Master File (DMF) on file with FDA? For the most regulated products, a Type II DMF filed with FDA provides the strongest evidence of manufacturer legitimacy.
Section 4: Supply Reliability & Business Practices (Items 17–20)
- What is their typical lead time and do they maintain inventory? Suppliers with no inventory and 4–6 week lead times may be contract manufacturing on demand without quality controls in place.
- Can they accommodate a sample CoA review before ordering? A reputable supplier will provide a sample CoA (with lot number redacted if preferred) for review before your first order. Refusal to do so is a red flag.
- Do they have minimum order requirements and do those align with your volume? Very low minimums (e.g., 1mg) may indicate the supplier is not set up for commercial-scale pharmacy supply programs.
- Are orders contingent on license verification? A compliant supplier should require proof of your pharmacy license before fulfilling any order. If they sell to anyone without license verification, that tells you something about how they vet their customers.
How Wholesale Peptide Distributors Scores on This Checklist
Wholesale Peptide Distributors satisfies all 20 items on this checklist. Our manufacturing partner's FDA facility registration is available on request, our cleanroom operates at ISO 5 classification, and every lot ships with HPLC, MS, endotoxin, and residual solvent data. We require license verification for all wholesale accounts and provide supplier letters suitable for state board submission. View our complete quality documentation on our quality standards page or contact our compliance team.
Frequently Asked Questions
What documentation must a 503A-compliant peptide supplier provide?
At minimum: HPLC purity report (≥99%), mass spectrometry sequence confirmation, endotoxin test result (<1 EU/mg), residual solvent analysis per ICH Q3C, and a supplier letter confirming the manufacturer's identity and regulatory standing.
How do I verify a peptide supplier's US manufacturing claim?
Ask for the physical address of the manufacturing facility and the FDA facility registration number. Cross-reference at FDA.gov. Legitimate US manufacturers provide this readily.
What are red flags when evaluating a peptide API supplier?
Key red flags: no lot-specific CoA, inability to provide manufacturing facility address or FDA registration, pricing significantly below market, no endotoxin testing data, and no license verification requirement.