Spearmint tea has been shown to enhance cognition - focus, concentration, memory. This product contains the amount shown in studies to be of benefit, 900 mg. Life Extension Magazine (2018) summarizes research indicating that spearmint can give you the same immediate boost as caffeine for working and spatial memory, yet without the stimulant effect. For benefits like concentration and attention, the effects were longer-lasting. The spearmint polyphenols were useful in sleep as well. These are studies with a small number of participants, yet significant results. see www.lef.com