To request your FREE sample of Head & Shoulders shampoo, "LIKE" Head & Shoulders on Facebook. Then click on the "Being a Good Girlfriend" tab. Scroll to the bottom of the page where it says, "Itchy Scalp Care" and click on "Get a Trial Product". If you are already registered with P&G, simply log-in or sign-up if you are new. About every 3 months, they offer new free sample products.