This Zinc supplement uses Zinc Sulfate to supply your body with the zinc it needs. This zinc sulfate supplement is taken once daily, with a meal as a supplement. Each serving (one capsule) contains 220 mg of Zinc Sulfate and delivers your body 50 mg of elemental zinc. The zinc in zinc sulfate represents 23% of its mass, so 220mg of zinc sulfate has 50mg of zinc in it. (got it?) 50mg of zinc is 333% of the recommended daily value. Many of our customers buy this product to combat hair loss. Some have reported good results. Recently, the package has been changed to read just zinc, instead of zinc sulfate. You should know that the product is the same, it is still a zinc sulfate product and it still contains the same amount of zinc sulfate. Each bottle contains 100 capsules.