Liquid Zinc + Quercetin by Trace Minerals has been formulated with these two powerful nutrients to provide an easy and delicious way to add them to your daily diet. Shake Vigorously. Take 1 tbsp daily with food or at mealtime. Mix with water, your favorite beverage, or take it straight. Refrigerate After Opening. We are America s #1 Trace Minerals Supplement Brand. Since 1972, Trace Minerals' branded products have been recognized around the world as the pioneer of ionic trace mineral products that have supported consumers in living healthy lives. Our products are third-party tested to give you the highest quality product with maximum absorption. Feel the difference with Trace Minerals!