Quality and testing
The verification page shows the result for the current batch. This page explains the process that produces it, the same checks we run on every single run of Zensulin.
Where Zensulin is made
Zensulin is blended and bottled in the United States in a facility that is registered with the FDA and follows current Good Manufacturing Practices (cGMP). In plain terms, that means documented procedures, trained staff, controlled environments, and records for every batch, so quality is built in rather than checked at the end.
What we test on every batch
- Identity and potency: confirmed by UHPLC, so each active matches its label amount.
- Heavy metals: screened by ICP-MS for lead, arsenic, cadmium, and mercury, with limits below 0.6 ppm.
- Microbial safety: tested against USP limits for total counts, yeast, mold, and pathogens.
- Solvent and purity checks: to confirm the finished liquid meets specification.
Our independent laboratory
Testing is performed by Birchgrove Analytical Laboratories, LLC, an independent, ISO/IEC 17025 accredited laboratory. Using a third party that is not us keeps the results honest. The most recent batch, ZSN-26H1-0382, passed with an active purity of 99.0% and a Certificate of Analysis on file as BG-COA-2026-7741. You can see the headline numbers any time on the verification page.
Sourcing
Good testing starts with good inputs. We buy botanicals from suppliers who provide certificates of identity and potency, favor standardized extracts so the active compounds are consistent, and reject material that does not meet spec. It costs more and it is slower, but it is the difference between a label you can trust and one you cannot.
Non-GMO and allergens
Zensulin is non-GMO and made without gluten, dairy, or soy. As with any supplement, if you have specific allergies or sensitivities, read the full ingredient list on the ingredients page and check with your doctor.
Next: verify your batch or read our guarantee.