Tested by an outside lab. Every batch. Before it ships.
The supplement industry is largely self-regulated. Most companies do not test what they sell, and most who do never publish what they find. We do both because the people taking Reversa deserve to know what is in the bottle.
Three things, every batch.
Every lot of Reversa is sent to an independent laboratory operating under ISO/IEC 17025:2017, the international standard for testing and calibration laboratories.
The lab confirms three things before a batch is cleared to ship. That the magnesium content matches what the label promises. That heavy metals are below pharmaceutical safety limits. That the product is microbiologically clean. If any of these tests fail, the batch does not ship.
Lot MGL250923.
Magnesium content
Reversa's label declares 275 mg of elemental magnesium per serving, sourced from 2,500 mg of magnesium glycinate. One serving is three capsules.
The lab tests one capsule at a time — the smallest unit of the product — and measures the elemental magnesium it contains.
The lab measured 96.91 mg of elemental magnesium per capsule, against a per-capsule minimum of 91.6 mg. Across three capsules — one full serving — Reversa delivers 290.73 mg of elemental magnesium, exceeding the 275 mg the label promises.
Heavy metals
Tested by ICP-MS — inductively coupled plasma mass spectrometry — the most sensitive method available for trace metal detection. Limits are based on USP <233>, the pharmaceutical standard for elemental impurities in oral products.
| Metal | Result | Daily limit (USP) | Status |
|---|---|---|---|
| Arsenic | 0.019 ppm | 15 mcg/day | Pass |
| Cadmium | [insert from full report] | 5 mcg/day | Pass |
| Lead | [insert from full report] | 5 mcg/day | Pass |
| Mercury | [insert from full report] | 15 mcg/day | Pass |
All four heavy metals tested at levels far below USP pharmaceutical limits.
Microbiological testing
Tested by Petrifilm and qPCR methods, against USP <2022> microbial limits for dietary supplements.
| Organism | Result | Limit | Status |
|---|---|---|---|
| Total aerobic plate count | <20 CFU/g | <100,000 CFU/g | Pass |
| Coliform | <20 CFU/g | <100 CFU/g | Pass |
| Yeast | <20 CFU/g | <1,000 CFU/g | Pass |
| Mold | <20 CFU/g | <1,000 CFU/g | Pass |
| Escherichia Coli | Negative/10g | Negative/10g | Pass |
| Salmonella | Negative/10g | Negative/10g | Pass |
| Staphylococcus Aureus | Negative/10g | Negative/10g | Pass |
The sample was inspected and confirmed free from visual mold, mildew, and foreign matter.
What these numbers mean.
The magnesium content matches the label. Not "approximately." Not "within tolerance." It matches — and slightly exceeds it.
The heavy metals are at levels considered safe by pharmaceutical standards — not just supplement industry standards, which are looser. The same limits a pharmacy uses to clear a medication for shelf are the limits we test against.
The product is clean of bacterial and fungal contamination, with all measured values either below the limit of detection or the strictest threshold in the standard.
This is what we test for, every batch, before it ships.
Want to see the complete certificate of analysis?
Email us with the subject line "COA request" and we will send you the full lab report for the most recent batch within one business day. The same address reaches our compliance team directly if you have specific questions about our testing methodology, sourcing, or manufacturing.
Email support@tryreversa.com →