This:
http://ayurveda-herbs.com/20.htm
or
this:
http://www.naturesformulary.com/Products/55-shankhpushpi.aspx
....the first one preferably, the second one if I run out of the first one.
Also, I take Mucuna pruriens and small doses of Caapi daily, sublingually.
Singular herbs that are renowned in the brain tonic realm:
- Bacopa monneira
- Gotu Kola (Centella asiatica)
- Shankhapushpi (either: Evolvulus alsinoides, Convolulus pluricaulis, Clitoria ternatea & Canscora decussata...various species are listed in various texts for Shankhapushpi...I've tried Evolvulus, Convolvulus & Clitoria (in a formula)...all three work great.)
- Vacha (Acorus calamus)
- Gingko biloba
Different ones are recommended for different types of people....depending on their natural psychosomatic temperament.
I've taken a lot of the DMAE, vinpocitine, phosphatidylcholine, ginkgo, tyrosine, phenylalanine, co-factors, this, that and the other type supplements over the past several years.....and none of it compares to a well-formulated Ayurvedic Medhya Rasayana (Mental Rejuvenative/Brain Tonic). My particular favorite being the Shankhapushpi Rasayana in the first link or a formula, that I usually improvise, based on Shankhapushpi.
For some people, Bacopa, Gotu Kola or Calamus will be more appropriate. Depends on the person's "Prakruti".

(google it)
I can't recommend the Ayurvedic Medhya tonics enough.
Edit: And yeah, a lot of the "ginsengs" are great: Panax ginseng, American ginseng, Ashawagandha, Suma, Rhodiola rosea, Siberian ginseng, etc... all go great with the Medhya herbs....but again, personal Prakruti.
