Based on customer reviews, Grenades Gum appears to be a legitimate product. It has received positive feedback from customers on various platforms. Customers have praised the gum for its strong flavor and long-lasting taste. Some have even mentioned that it helps with sinus issues. The customer service of Grenades Gum has also been commended for being prompt and accommodating. However, as with any product, experiences may vary, and it's always a good idea to do thorough research before making a purchase.