I'm also worried about heavy metals. I read a study that said that 7/8 kratom products in the us contain unsafe amounts of heavy metals. My advice for you is: 1. Get a scale and reduce your gdp to 15g or less. 2. Keep in mind that just because a website says they do lab tests doesn't mean anything. Most of the lab tests are outdated and most vendors don't test every batch. Make sure the vendor can offer an updated lab test.