Dr. Mercola Zinc DropsYour immune system is your first line of defense against everyday threats, and regardless of what conventional medical professionals say, theres much you can do to support it. Zinc may be the most important helper nutrient for your immune system to perform optimally.* Yet, as many as two billion people dont get enough of this vital mineral, including these especially vulnerable groups: Adults 60 years old and over Strict vegetarians People with a poor