Shells contain the energy of 59 kilocalories, 8 grams of protein, 3.6 grams of carbohydrates, 1.1 grams of fat, calcium 133 milligrams, 170 milligrams of phosphorus, and 3 milligrams of iron. Also in the shell also contained vitamin A as much as 300 IU, vitamin B1 0.01 milligram and vitamin C 0 milligrams. The results were obtained from a study of 100 grams of shellfish, with an edible amount of 20%.source