NSF® - Contents certified Dietary Supplement Providing quality products since 2001. Description: Dietary Supplement Dr. Mercola has been providing quality products since 2001. Suggested Use: Adults, as a dietary supplement, take one... Zinc deficiency is a widespread concern for people around the world – nearly 1 in 3 individuals may be deficient. Because the signs of a zinc deficiency mimic those of other common disorders, it’s often overlooked. Each serving provides 15 mg of zinc – the perfect dose to support organ and normal immune health without worry of getting too much.