If you're here looking up GNC.com customer care, you probably already know who they are. But it helps to get an idea of how big they are and what their support operation looks like if you are a customer. GNC.com also goes by or is associated with the names GNC Holdings Inc., GNC. They are considered to be part of the following sectors and industries: Consumer Discretionary, Retailing. GNC.com is associated with terms like public, retail, food, e-commerce, b2c by their customers and industry analysts. They employ 16,800 people according to customers in the know.