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There is no official recommended daily amount of silica, although studies have shown that the average healthy diet includes 1-1.5 grams of it per day. If there is not sufficient intake of fresh produce, filtered water or unrefined grains in the diet, silica intake could be found to be insufficient.
Either increasing the amount of silica-rich foods in the diet or supplementing with 5-10 milligrams per day has been found to relieve many of the known symptoms of a deficiency while simultaneously boosting the health of other functions. *