Every traditional medicine system that has developed a concept of cognitive health has also developed plants for supporting it. The Ayurvedic medhya rasayanas (herbs specifically for the mind and nervous system) are a formal category with thousands of years of use behind them. In Chinese medicine, herbs for shen (spirit and mental function) are a well-established category. In Western herbalism, the concept of nervine tonics for cognitive support has a long tradition alongside the better-known nervine relaxants.
Lion’s Mane Mushroom (Hericium erinaceus)
Lion’s mane is the mushroom that has attracted the most contemporary research interest for cognitive applications, and the research is reasonably compelling. It contains compounds (hericenones and erinacines) that appear to stimulate nerve growth factor (NGF) production, which is relevant to the maintenance and repair of neural tissue. Several clinical studies have found it effective for mild cognitive impairment in older adults, and its use for focus and clarity in healthy adults has a growing body of supporting research alongside a strong traditional basis in Chinese medicine.
Rosemary (Rosmarinus officinalis)
Rosemary has a long folk tradition as a memory herb (the phrase “rosemary for remembrance” goes back centuries), and the research has been surprisingly supportive. Inhaling rosemary essential oil has been shown in studies to improve cognitive performance on certain measures, and its carnosic acid content has neuroprotective properties. As a herb used regularly in cooking and as an occasional tea, it is one of the most accessible cognitive-supporting plants.
Bacopa (Bacopa monnieri)
Bacopa is one of the classic medhya rasayanas of Ayurveda, with a long history as a herb for memory, learning, and mental clarity. It is an adaptogen that works specifically on the brain, and multiple clinical trials have found it effective for improving memory and cognitive function in both older adults and healthy subjects. It requires eight to twelve weeks of consistent use before its effects become apparent, which is characteristic of the trophorestorative action it shares with other Ayurvedic tonics.
Ginkgo (Ginkgo biloba)
One of the most studied plants in the world for cognitive applications, ginkgo improves cerebral circulation and has significant antioxidant activity relevant to neural tissue health. It has been studied most for age-related cognitive decline, but its use as a daily tonic for circulation and mental acuity has a long tradition in both Chinese medicine and contemporary herbal practice.
The Herbalist Codex app has full profiles on all these cognitive herbs with their research summaries, appropriate doses, and the traditional contexts from which they each come.