Thank you for reaching out with your question. We appreciate your interest in understanding our lab test scale. Mike has written an informative article on Natural News that explains the development of the scale, the meaning behind the numbers and letter grades, and how the numbers are adjusted for each letter grade. You can find the article here: Low Heavy Metals Verified. We hope this provides clarity and answers your questions. If you have any further inquiries, please feel free to reach out.
Feb 12, 2025