In my opinion, immune dysfunction due to underlying infections and imbalances is one of the most prominent reasons for elevated glutamate levels.  Herbs are used to help combat underlying infections, intestinal overgrowth, and pathogens, calm microglial activation, and restore proper gut and neurological function. Many families start with culinary herbs, slowly work to incorporate healing herbal teas, and build up from there (powders, tinctures, etc) based on their individual needs. We've personally found the most benefit from herbs by introducing one at a time, going low and slow (you don't want to induce the cell danger response [...]