Mixtures of various types of herbs, including legumes and cereals, as well as herbs that grow on soils with a high content of minerals, are usually used to produce herbal flour with a high content of minerals.
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For example, these may be herbs grown in fields where mineral fertilizers were previously applied. In addition, the mineral content of herbal flour can also be influenced by the way it is prepared - some technologies allow you to save more minerals than others.