Quiet Nerves carries a 60-day money-back guarantee from the date of purchase.
The guarantee runs for 60 days from purchase and covers dissatisfaction with your experience. That window comfortably covers the several weeks nutritional support of this kind typically needs to become a settled habit.
Contact the official store directly with your order number, within the 60-day window. Some guarantee programmes require unused bottles to be returned; confirm what applies to your order before shipping anything back.