Zinc is found in Yeast (didn't know that?) and it far surpass that of Zinc Gluconate salts.
Why do you need Zinc?
It is vital for the maintenance of a healthy immune system. It can influence Memory, Muscle Strength and even Endurance in adults (Wow)! For very young children, Zinc is essential for Motor, Cognitive and Psychosocial functions (Now I hear mums scrambling out to get Zinc for their children..).
Before you go, here's the article for further reading!