Toxaprevent is a medical device, and the safety and quality mangement system ensures that NO contaminants or heavy metals are in our patented process. We are certified as a medical device as we are proven as safe for long term usage as Toxaprevent does not enter the liver or kidneys to be processed. The testing for contaminants are done on site, off site and verified by our governing body and these results are part of our Quality Management System. So safety is at the forefront of what we offer. Zeolites which have 0 safety data for long-term usage produce these third party verification tests, but it does not relate to batch numbers and can be very selective when they test and what they test. Here's a video explaining Zeolite Clinoptilolite in more detail on our YouTube channel: Stop using the WRONG Zeolite