Why calcium is important for Kids. Calcium is vital for building strong bones and teeth, promoting nerve and muscle function, helping blood clot, and activating the enzymes that convert food into energy. ... And because children are growing new bone all the time, they need a steady supply of calcium to support healthy growth. We only get one chance to build strong bones — when we're kids and teens. Children who get enough calcium start their adult lives with the strongest bones possible. That protects them against bone loss later in life. Develo NostoCa Kids is a testier way to supplement Calcium for kids and it is convenient as well. Just dissolve the powder in water as directed and drink.