Yes, because clays (and microcrystalline zeolite powders) are formed around an aluminium core. Some other common aluminium-containing clay powders are bentonite, kaolinite, and montmorillonite. Every clay powder on earth has a chemical “backbone” of metals in its structure. The important part to consider is the ratio of silica-to-alumina and their relative bioavailability from the zeolite since they are not uniform across all sources. The crystalline structure, pore size, and amount of silicon present vary greatly in zeolites, which makes each one operate differently. When there is more than 6 times the amount of silicon than there is aluminium, as in the zeolite we use for G.I. Detox+, then it attracts heavy metals (and all cations) to the compound and does not leach them out. When the zeolite is laden with an excess of silicon it creates a strong attraction for more metal minerals. Then we add additional highly bioavailable Silica and other binders to the zeolite creating an even stronger “pull”. It is virtually impossible for a human digestive tract to free the aluminium from the zeolite we use, so there is little to no potential for aluminium absorption into the body from the G.I. Detox+. Our zeolite powder is rigorously tested for any impurity by a third party, prior to inclusion in G.I. Detox+ capsules at a cGMP facility.