Abby, the use of "alternative" cholinesterase inhibitors, must be done with care. Caffeine is also in that group, but to have a similar level of effect as Mestinon, with Caffeine, would cause far, far more side effects.

I do not know how effective huperzine is, or if it is possible to find a pure source thereof. But it will without doubt have its own list of side effects. So if taking a large enough dose, causes other problems, then it is not really a help.

Just be careful.