Healthy zinc levels support male fertilityZinc’s ability to support reproductive health is one of the mineral’s most popular benefits. That said, people should be cautious about overdoing it with zinc supplements. Zinc is essential for a well-equipped immune systemTechnically, you cannot boost your immune system. "Zinc is essential for the normal development and function of the immune system,” says Pourafshar. For the best defence against colds and the flu, Pourafshar recommends maintaining optimal zinc levels year-round – not just when you start getting texts about your annual flu jab – and also remembering that zinc isn’t the only player in your immuni-team.