Several teas and herbs are believed to support cognitive function, aiding in mental clarity, focus, and overall brain health. From the list provided, the following are known for their potential cognitive benefits:

1. Green Tea: Contains L-theanine and antioxidants that can promote focus and cognitive function.

2. Ginkgo: Known for its potential to enhance memory and cognitive speed.

3. Gotu Kola: Believed to support mental clarity and memory retention.

4. Holy Basil: Helps reduce stress and can support cognitive function.

5. Rosemary: Known for its potential to improve memory and concentration.

6. Sage: Some studies suggest it may improve memory and cognitive function.

7. Peppermint: Aids in alertness and cognitive performance.

8. Ginger: Contains antioxidants that may support overall brain health.

9. Cinnamon: Can potentially aid in cognitive function due to its antioxidant properties.

Remember, while these herbs and teas are believed to have cognitive benefits, individual responses may vary. It's always best to consult with a healthcare professional before incorporating new herbs or teas into your routine, especially if you have any health conditions or are taking medications.