1, sesame is the seed of the sesame plant in the family of Huperziaceae, which is similar to huperzine and has similar flavor and nutrients, so you can consider using sesame as a substitute for huperzine.
2, not interested in sesame seeds, you can consider other nut ingredients as a substitute, including walnuts, almonds, cashews and so on. These nut ingredients are also rich in protein, fat and many vitamins and minerals.