GNC provides friendly, fast, and courteous service. Customers appreciate the helpful staff who are willing to answer questions and offer guidance on supplements and health goals. The team is knowledgeable and always makes customers feel welcome, going above and beyond to assist. Many have had great experiences over the years, with staff members like Landon, Casey, Michael, and Bryce being especially praised for their helpfulness and expertise. Orders are prepared quickly, and the staff is attentive, ensuring customers leave satisfied and well-informed. Overall, GNC in Sioux Falls is a reliable and welcoming store for those seeking health and supplement advice.