Include iodine, sulfur, zinc, and silica in your diet. Good sources of iodine include all types of fish, spirulina, iodized and sea salt. Food rich in sulfer includes onions, garlic, cabbage, celery, and watercress. Zinc can be found in pumpkin seeds, whole grains, oysters, nuts, and beans. Good sources of silica include flaxseeds, wheat grass, almonds, sunflower seeds and grapes.