Our take on Prop 65 for natural clays

As required by the State of California, we include a Prop 65 warning for our clay-based products.

This warning is triggered by the presence of trace, naturally occurring metals (below FDA guidelines) in one of our ingredients: calcium montmorillonite bentonite clay.

At first glance, this may sound concerning. Here’s what it means in context:

Calcium montmorillonite clay is a minimally processed, earth-derived material. Like many natural substances—including certain foods/plants and mineral-rich soils—it can contain trace levels of naturally occurring elements, such as lead and other metals. In this case, those elements exist in a bound state within the clay’s structure due to its strong negative charge and high cation exchange capacity, helping limit their bioavailability.

Proposition 65 is a precautionary law with extremely conservative exposure thresholds, and it applies broadly—even in cases where trace elements are naturally present and widely considered safe at typical exposure levels. 

We believe the calcium montmorillonite (bentonite) clay in our Mineral Toothpowders and Living Clay, is safe when used as directed. We chose it intentionally for its unique properties to adsorb beneficial minerals and absorb bad bacteria, as a natural, earth-based, earth-friendly (nontoxic) ingredient.

For more information, please refer to our FAQ.