We use Energized Trace Minerals in Turmeric to increase the bioavailability. Although the mineral content is part of our proprietary processing technique, we source them from activated crystallized alkaline salts and Korean Bamboo salts. Here you have more information: https://globalhealing.com/natural-health/energized-trace-mineral/. If you choose to try Turmeric for yourself, please know that we always offer free shipping in the US and Canada and a one-year money-back guarantee in case you're not completely satisfied with your purchase.