Supliful has received negative feedback from users, primarily criticizing its customer service and fulfillment process. Users report issues with stock management, delayed shipping times, and a lack of communication, leading to dissatisfaction and a poor experience. The subscription business model is also viewed unfavorably, as users feel they are paying for inadequate service. Overall, the reviews suggest that Supliful struggles with reliability and customer support, impacting its reputation among those who have tried to launch their supplement lines through the platform.