Value Per Nutrient Food 0.03 g 100 grams Tryptophan Broccoli, frozen, chopped, cooked, boiled, drained, without salt 0.03 g 100 grams Tryptophan Kale, frozen, unprepared 0.03 g 100 grams Tryptophan Yogurt, plain, skim milk, 13 grams protein per 8 ounce 0.03 g 100 grams Tryptophan Beans, adzuki, yokan, mature seeds 0.03 g 100 grams Tryptophan Corn, sweet, yellow, frozen, kernels cut off cob, boiled, drained, without salt 0.03 g 100 grams Tryptophan Rice, white, long-grain, regular, cooked, unenriched, without salt 0.03 g 100 grams Tryptophan Amaranth leaves, raw 0.03 g 100 grams Tryptophan Potatoes, mashed, dehydrated, prepared from granules with milk, water and margarine added