Thank you for purchasing Neuronex ST at www.NeuronexST.com & www.aacresearch.com operated by AMERICEUTICAL. In order to be eligible for a refund, you have 60 calendar days from your purchase. AMERICEUTICAL offers a 100% Satisfaction - Empty bottle no return necessary & NO QUESTIONS ASKED policy if your needs are not perfect! This is why we’re the best! Limit to one refund per person, per product.