huperzine a 400mcg per serving, 180 capsules, (huperzine a supplement), supports focus, cognition, memory and learning ability, no gmos naturebell huperzine a is a substance purified from a plant called chinese club moss. it is used for memory and learning enhancement, and age-related memory impairment. it is also used for increasing alertness and energy, and for protecting against agents that damage the nerves such as nerve gases.