Our manufacturer works with well-known suppliers to obtain the highest quality herbs possible. The daily suggested use of our formulas keeps most, if not all, of our products well under any concerns over potential limits for metals.
However, herbs/ingredients are tested when they are known to be high in heavy metals, and/or if those ingredients are in large enough amount that they may pose a risk for heavy metal adulteration.
Our manufacturer also constantly monitors FDA watch lists for herbs that are found to be at risk for heavy metals and other types of adulterants, and tests each ingredient as necessary.