How we test
We measure vitamins and related nutrients by HPLC or LC-MS, depending on the compound and the product. Results are given per unit, so you can compare them with the amount stated on the label.
Water-soluble and fat-soluble forms are extracted differently. We can run several vitamins in one sample.
What we measure
| Method | HPLC-UV, HPLC-MS or LC-MS, depending on the compound |
|---|---|
| Quantitation | Calibrated against reference materials |
| Products | Tablets, capsules, liquids, powders and gummies |
| Report | Amount per unit, with comparison to the stated value |
What is on the certificate
- Each compound with the amount found and units
- Stated value and measured value
- Method and test date
- Certificate Number and QR code
What to send
- Finished product in its original or a sealed package
- The label or a list of nutrients and stated amounts
- Batch or lot number
Please wait for our packing instructions before you ship. They confirm amounts, container, temperature and where to send the samples.
Independence. Global Pure Laboratory is an independent testing lab. We do not make, source or sell the compounds we test, and we do not endorse any of them.
Research use only. For research use only. Not for human or animal use, or for use as a drug, food, device or cosmetic.