Complan Chocolate is a nourishing drink that can be made with either milk or water. Sip it warm; enjoy it chilled; add a little to your favorite recipes. Complan is a source of protein, which is derived from milk. Milk protein has all the essential amino acids. Complan has 34 vital nutrients such as calcium, iron, zinc, vitamin-A, protein, phosphorus, vitamin -D, magnesium, that are essential for the growth and development of children.