Active Ingredient: 1% Pyrithione Zinc If you are interested in a larger quantity, please message me. I buy from multiple suppliers, which sometimes overlap. If one has the item out of stock, I still may be able to find more for you. Also, since Ebay limits the number of my listings, I usually only list one of each item I have, even if there is more stocked. I do combine shipping when possible. Some items (such as glass bottles, or large items) are unable to be combined.