The average cost of calcium gluconate per kg is $5.75. Its molecular formula is C12H22CaO14. Calcium gluconate is a mineral supplement and is a salt of calcium and gluconic acid. It is a fine, white, odorless powder. It is widely used to treat conditions arising from calcium deficiencies, especially in the treatment of hypocalcemia. It has side effects like nausea, stomach upset and constipation. It is used as an antidote.