NeuroPrime carries a 365-day money-back guarantee from the date of purchase.
The guarantee runs for 365 days from purchase and covers dissatisfaction with your results or your overall experience. That window comfortably covers the 6 to 10 weeks nutritional support of this kind typically needs to show an effect, with considerable room to spare.
Contact the official store directly with your order number, within the 365-day window. Some guarantee programmes require unused bottles to be returned; confirm what applies to your order before shipping anything back.