Alpinia galanga - a novel CNS stimulant? Commercial extracts sold to 'promote energy levels while also improving attention span and mental alertness' are a 10:1 aqueous extract with doses being 300mg (equivalent to dry rhizome 3g). I got close with an 8:1 resinous extract ( = 375mg to get 3g) doing a crude aqueous extract. Of the galangal extracts, the aqueous extract of A. galanga was found to be the most efficient in enhancing the mental alertness which was further assessed by a well-designed clinical study in the human population: it was "more efficient compared to caffeine to maintain the mental alertness without inducing the caffeine-crash like symptoms" [1]. It has actions of inhibiting dopamine reuptake leading to an attention-enhancing effect with additional AChE inhibition. Initial TLC of acetone extract of powdered Alpinia galanga: All solvents tried (acetone, white spirits:acetone:1:1) gave poor resolution of the constituents 1 TLC (silica, 0.2mm, glass backed a) acetone b)acetone:white spirits:1:1 elution, I 2 visualisation) of acetone extract of powdered Alpinia galanga Preparation of aqueous extract: Dried powdered herb was extracted with boiling water: 2 3 Affording a resinous tar: 4 [1] https://m.scirp.org/papers/86091 5