There are many different factors involoved in answering this question. Where is the bentonite coming from? The most likely source of bentonite would be Montana or Wyoming but bentonite can come from just about anywhere. If bentonite happens to come from a coastal region, then yes it will more likely than not contain silica.

I will verify this information and get back to you. If you have a sensitivity to silica... I would advise caution when using betonite as a cleansing agent.

Thank you for your question.

Best luck on your journey to good health.

Namaste.

Kelley