L-theanine is a rare amino acid. This amino acid, with apparently only one exception, is found only in certain species of tea plants. It constitutes between 1 and 2% of the dry weight of tea leaves and accounts for approximately one-half of all the free amino acids present in the leaves.
Zen Theanine is recommended for people in need of a natural anti-stress than can help to regulate mood.
Yet another trial with L-theanine looked at its effects upon liver health. A known liver toxin, D-galactosamine, was employed. L-theanine was shown to be active in preventing injury to the liver, whereas glutamine in equal amounts showed no protective effect. Studies using other models of liver injury also have demonstrated benefits.
L-theanine, furthermore, appears to protect against certain so-called "excitotoxins." It modulates the motor-stimulation associated with caffeine, and it inhibits some of the actions of norepinephrine in the central nervous system, for instance. In tests with gerbils, L-theanine protected against the destruction of neurons induced ischemia, a condition which can lead to a rapid increase in glutamate in neurons and result in the death of these cells.
Medicinal ingredient: 225 mgL-theanine
Non-medicinal ingredient: Capsule: hypromellose.
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