Neutrogena is offering a free sample of their Hydro Boost Water Gel Cream. This promotion is available through sponsored social media ads on platforms like Instagram, Facebook, and TikTok. 

 To potentially receive a free sample of Neutrogena Hydro Boost Water Gel Cream, you need to actively follow Neutrogena's social media accounts and engage with their posts. By liking and commenting on their content and searching for the product online, you may trigger a targeted ad offering the free sample. This sample is provided on a "while supplies last" basis.