To think is to be human (no doubt some animals really do think – but not in the league with us). We can proactively reason, calculate, contemplate, project, wonder, imagine, draw conclusions, formulate complex theories, solve complex problems and make logical guesses. Several tonic herbs have long been valued in the East for supporting thinking. Duanwood Reishi, Schizandra, Himalayan Rhodiola, Deer Antler, Red Ginseng, wild Chinese Ginseng and wild American Ginseng have been used by countless masters to help them think. These are natural nootropics (substances that promote thinking).