Is there a specific reason the two brands you recommended are significantly more expensive?
I had a difficult time finding those brands. Is there a certain site that you prefer?
A much better alternative is PS-100 (Phosphatidylserine) which has no negative side effects. Its a brain chemical that replenishes the inner neural membrane; it enhances brain activity, memory, and whole host of other things. I highly recommend it as an alternative. I recommend getting the integrative thereaputics or pure encapsulations brand.