Boric acid for white crystalloid powder or colorless microstrip pearl shape burnish scale, stimulating, and can be used as chemical reagent and production cockroach, beetles, pesticides, in medicine as hemostatic and antiseptic on. Boric acid wasn't allowed as food additives, but folk often will borax or boric acid as insecticidal adding food preservatives use phenomenon, early also have will boric acid for food preservatives and leavening agents of the problem. Due to the accumulation of boric acid in the body excrete slowly, affect digestive enzymes, the daily edible 0.5 g role can cause anorexia boric acid, hamper nutrient uptake, so that the weight loss. 1 ~ adult consumption can cause poisoning 3g, main show have nausea, vomiting, abdominal pain, diarrhea, some people will be gastrointestinal symptoms and central nervous system and skin symptoms, including lethargy, headache, muscle spasms and skin rashes and other symptoms.