For three generations, Person & Covey, Inc. has made quality products with the finest innovations in dermatological care and sun guard. Family-owned since 1941. Based in California, USA. Wash your hair with DHS Zinc Shampoo 3-4 times a week, or as directed by your doctor. Use with DHS Regular or Clear Shampoo on the other days so your hair stays healthy. Get instant relief starting with the first use. This calming unique formula is easy on your scalp and hair. Enjoy soft shiny hair with no more flakes. Convenient 8 oz bottle. Soothing nourishing formula contains 2% Zinc Pyrithione. PABA free. TEA Lauryl Sulfate-free. Dermatologist recommended for fast-acting relief from dandruff and seborrheic dermatitis flare-ups. Gentle and clean on your scalp and hair.