Herbal medicine has long been used to improve cognitive function and brain health. In Ayurveda, specific botanicals, known as rejuvenative plants, are believed to shift the brain to higher frequencies from its regressive patterns of fear, desire and ambition based on egoistic function. Rejuvenative plants contain what is called Soma, the nectar of immortality, also called Ojas. It is the basis for clarity of perception, physical strength and endurance, and strong, healthy tissues. It is the subtle essence and energy of the nervous system. Here's a list of the top 7 rejuvenative plants used as Ayurvedic brain supplements.