The page says to take it preferably after a meal.
What the page says
It suggests after a meal and notes that doing so helps if the capsule feels unsettling on an empty stomach.
A practical view
If you feel nauseated, take it with food. If symptoms persist, stop and ask a doctor. Follow the label first.
Educational note: This guide is general information based on the Quiet Nerves page. Statements have not been evaluated by the Food and Drug Administration. The product is not intended to diagnose, treat, cure or prevent any disease. Individual results vary.