Standard suggested use for adult:  2 dropperfuls 3x a day. One bottle will be an approximate 2 week supply. Brain & Nervous Systems is a tonic brain supplement that includes ginkgo and gotu kola, two of the best nootropic herbs for enhancing cognitive function, boosting memory, and improving physical performance. Adaptogen herbs astragalus, eleuthero, he shou wu and schizandra berry are included to boost immunity and support a healthy stress response.* All Herbs in our Formulas are Organic, Wildcrafted, or Consciously Cultivated This product is made to a 1:4.3 herb-strength ratio. -Please consult with your physician before taking this or any dietary supplement.  *FDA warning: This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.