A Certificate of Analysis (CoA) is the document that accompanies each batch of pharmaceutical raw material. It's the analytical identity card of your vitamin C.
What is a Certificate of Analysis?
A CoA is an official document issued by the manufacturer or an independent laboratory certifying compliance with European Pharmacopoeia (Ph. Eur.) specifications.
It's not a marketing document. It's a standardized technical document used in pharma for decades.
Key Sections of a CoA
1. Batch Identification
Header contains: product name, batch number, manufacturing date, expiration date, manufacturer name, monograph reference.
2. Purity Test (Assay)
Ph. Eur. requires minimum 99.0% L-ascorbic acid. Quality pharmaceutical grade shows 99.7% or higher.
3. Heavy Metals and Elemental Impurities
Regulatory limits per ICH Q3D and Ph. Eur.:
| Element | Ph. Eur. Limit | Expected result (good CoA) |
|---|---|---|
| Lead (Pb) | <0,5 ppm | <0,1 ppm |
| Arsenic (As) | <0,3 ppm | <0,1 ppm |
| Mercury (Hg) | <0,1 ppm | Not detected |
| Cadmium (Cd) | <0,5 ppm | <0,1 ppm |
4. Microbiological Tests
TAMC <1000 CFU/g, TYMC <100 CFU/g, absence of E. coli and Salmonella.
5. Physico-chemical Tests
Appearance, pH, specific optical rotation, loss on drying (<0.4%), sulfated ash (<0.1%).
Red Flags to Watch For
What should alert you on a CoA:
- No batch number — the document is generic
- Reference to internal standard instead of Ph. Eur. or USP
- Purity below 99.0%
- No heavy metals tests or compliant without numerical value
- Undated document or unidentified issuing laboratory
- Missing microbiological results
How to Request Your Batch CoA
At France Vitamine C, the CoA is available upon simple request with your order number.
A seller who refuses to provide their batch's certificate of analysis probably has nothing good to show.
Summary
The certificate of analysis is the only objective document proving a supplement's quality.