Peptide document guide
Peptide COA vs Supplement Facts: what each can prove
Use the field-by-field guide to compare a Supplement Facts panel with a supplier COA without treating either document as proof of the other.
TL;DR
Match the report to the material first. Then compare its methods, limits, and actual results with the identity and serving amount declared on the label.
Key takeaways
- FDA's dietary supplement labeling guide requires names and quantities of dietary ingredients, Serving Size, and Servings Per Container when required in the Supplement Facts panel.[1]
- FDA's supplement manufacturing guide defines a supplier COA as a document that records characteristics and attributes of a component.[2]
- When a supplement manufacturer relies on a supplier COA, FDA says the document includes test methods, test limits, and actual results.[2]
- The same FDA guide requires the manufacturer to establish the supplier COA's reliability and periodically reconfirm it.[2]
- FDA says compounded drugs are not FDA-approved and receive no agency premarket review for safety, effectiveness, or quality.[3]
The two documents carry different jobs
| Document | Core fields | What it supports | Boundary |
|---|---|---|---|
| DocumentSupplement Facts | Core fieldsDietary ingredient names and quantities, Serving Size, and Servings Per Container when required.[1] | What it supportsWhat the dietary supplement label declares per serving. | BoundaryIts required fields do not supply the analytical method or result for a named lot. |
| DocumentCertificate of analysis | Core fieldsTest or examination methods, limits, and actual results in FDA's supplier-COA guidance.[2] | What it supportsWhat the stated analysis found for the material identified by the report. | BoundaryFDA approval is a separate agency determination about a product and its intended use.[4] |
A result needs a clear material match
Separate from its supplier-COA fields, FDA's supplement manufacturing guide requires a unique identifier for each component lot that traces to the supplier, receipt date, component name and status, and the finished supplement.[2]
That traceability principle is the useful part for a public report. A result with no product, material, batch, or lot connection leaves the reader unable to tell what the laboratory result covers.
- Material identity: look for a named material and match it to the represented product.
- Traceable identifier: the report and the represented material share a batch, lot, or other unique reference.
- Method and limit: the report says how the test was run and what threshold was used.[2]
- Actual result: the document reports the measured or observed outcome, not only a word such as tested.[2]
Regulatory status comes from FDA's current record
Regulatory status comes from the regulator's current record. FDA explains that new human drugs and biological products generally need approval before interstate marketing.[4]
FDA separately states that compounded drugs are not FDA-approved. A purity or identity result does not change that status and does not supply the safety or effectiveness review FDA performs for an approved product.[3]
Read the report next to the label
A side-by-side comparison keeps the fields separate. The label supplies the declared identity and amount. The report supplies the tested material, method, limit, and result. Any mismatch stays visible.[1][2]
pepSmart's peptide COA reading guide offers more field-level context. NutriScore's supplement safety guide cluster covers the wider testing and contamination questions for dietary supplements.
Related peptide label guides
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Peptide supplements vs injections: label and record checks
A document-first map for comparing product labels, facility records, FDA records, and certificates. It separates the question each record can answer.
Peptide status guide
What "research use only" means in peptide product labeling
Use the document map to compare seller wording with approval, intended-use, supplier-COA, and human-evidence records.
Safety guide hub
Supplement safety guides: heavy metals, COAs, and testing
Follow NutriScore's guides to COA literacy, certification checks, contamination questions, and cautious label reading.
Label scam guide
Supplement label scams: FDA-approved claims and fake badges
Check approval wording, testing badges, proprietary blends, and dose claims without treating marketing as evidence.
Sources behind this guide
- Dietary Supplement Labeling Guide: Chapter IV. Nutrition Labeling. U.S. Food and Drug Administration. Content current as of: 2005-04-01.
- Small Entity Compliance Guide: Current Good Manufacturing Practice in Manufacturing, Packaging, Labeling, or Holding Operations for Dietary Supplements. U.S. Food and Drug Administration. Content current as of: 2018-09-20.
- Understanding the Risks of Compounded Drugs. U.S. Food and Drug Administration. Source date: 2026-06-22.
- Is It Really 'FDA Approved'?. U.S. Food and Drug Administration. Source date: 2026-05-04.
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks. U.S. Food and Drug Administration. Source date: 2026-04-22.
Keep both documents within their stated scope
A report with no material match cannot show which material its results cover. Record that gap beside the label declaration.
NutriScore has not commissioned independent clinical review of this article.
Read the editorial process and contributor disclosure and the scoring methodology.
Corrections: support@nutriscore.fit.
Sources: 5 entries, all primary canon, last reviewed 2026-08-26.
For research and educational purposes only. Not medical advice.