Rasayana – means Rejuvenation.
Medhya Rasayana (मेध्य – रसायन)- a type of Rasayana or the combination of herbs that help in rejuvenating the brain.
According to Ayurveda, Medhya Rasayana works on three aspects of our nervous system – Intelligence (धी), Retention (धृति) and Recall (स्मृति).
In other words, Medhya Rasayana helps in bringing positive impact on intelligence, its retention and quick recall. As per Acharya Charaka, Medhya Rasayana not only acts on rejuvenating the nervous system but also helps prolong life, capable of curing several diseases, improve overall immunity, digestion, lustre of skin, and speech (voice) (Reference – Charak-Samhita – Rasayana Adhyaya).
Some of the herbs which have been identified as Medhya Rasayana are – Mandukparni or Brahmi (), Shankhpushpi, Mulaithi, Guruchi, Ashwagandha, Vacha, Jatamansi etc.