9. Theanine
L-theanine is an amino acid concentrated in certain teas, including green tea.
Some research indicates that supplementing with L-theanine may help improve brain function in middle-aged adults and protect against age-related liver dysfunction, oxidative stress, and inflammation.
10. Rhodiola
This medicinal plant has potent anti-inflammatory properties.
Several animal studies suggest that rhodiola may help promote longevity. However, more human research is needed.