# Methylene blue origin-claim verification worksheet

Product name: ____________________  Supplier: ____________________

Lot number: ____________________  Date checked: ____________________

Product label or listing URL: ______________________________________

## Terminology key

| Claim | Meaning to verify | Evidence to request |
| --- | --- | --- |
| Organic dye | Carbon-based chemical classification | Exact substance identity |
| Synthetic | Chemical manufacturing origin | Manufacturer's production description |
| Natural or plant-derived | Named source and processing claim | Source species, ingredient identity, traceability |
| Certified organic | Compliance with a named agricultural standard | Certifier, certificate, operation, covered product or ingredient |
| Food-grade or human-grade | A specific intended-use and quality claim | Named specification and applicable product documentation |

## Five checks

1. Ingredient identity
   - Substance name: ____________________
   - Concentration and units: ____________________
   - Solvent and other ingredients: ____________________
   - Which ingredient does the origin claim describe? ____________________
2. Meaning of the claim
   - Exact wording: ____________________
   - Chemical classification or agricultural certification? ____________________
   - Evidence supplied: ____________________
3. Source traceability
   - Claimed source species or chemical-production origin: ____________________
   - Manufacturer named: ____________________
   - Documentation connects source to this ingredient: yes / no / unclear
4. Certification scope
   - Scheme and certifier: ____________________
   - Certificate identifier and verification location: ____________________
   - Named operation and covered ingredient or product: ____________________
   - Coverage matches this claim: yes / no / unclear
5. Batch and intended use
   - Analytical report identifier: ____________________
   - Lot matches bottle: yes / no / unclear
   - Named specification and reported results: ____________________
   - Stated intended application: ____________________
   - Documentation supports that application: yes / no / unclear

## Decision record

Claim supported by the supplied evidence: ____________________

Claim still unverified: ____________________

Specific document or clarification needed: ____________________

Do not treat an unchecked or unclear field as verified. This worksheet evaluates documentation, not medical suitability or an ingestion regimen. Organic chemistry is different from agricultural certification. In USDA percentage calculations, water and salt are excluded and cannot be labeled organic.

## Source references

1. [IARC: methylene blue identity, synthetic origin, and natural occurrence](https://www.ncbi.nlm.nih.gov/books/NBK350467/).
2. [American Chemical Society: organic chemistry](https://www.acs.org/careers/chemical-sciences/areas/organic-chemistry.html).
3. [USDA: organic labeling requirements and certificate scope](https://www.ams.usda.gov/services/organic-certification/international-trade/labeling-requirements-US-organic-market).