Source Naturals L-Theanine 200mg

60 tablets
L theanine Supplements

L-Theanine is an amino acid only found in the green tea plant (Camella sinensis)which has been found to exhibit calming and relaxing effects without sedation. It can cross the blood brain barrier to support healthy production of the neurotransmitters GABA and Dopamine in the brain. Studies also have shown that the amino acid L-theanine can inhibit the stimulating effects of caffeine and can also assist in providing reliable immune support.

Supplement Facts

Serving Size: 1 Tablet
Servings Per Container: 60


Amount Per Serving

% Daily Value


76 mg



200 mg


† Daily Value not established.

Other Ingredients: Dibasic calcium phosphate, microcrystalline cellulose, magnesium stearate, stearic acid, silica, modified cellulose gum and hydroxypropyl cellulose.

Suggested Use

Take 1 tablet 1 to 2 times daily.


Not for use by infants, children or women who are pregnant, may become pregnant or breastfeeding. If you are taking any antidepressant drugs, such as MAOI's or SSRI's, consult your health care professional before taking this product.


  • L-theanine supports the body’s tolerance to stress to help cultivate total emotional health. The brain uses it in the production of serotonin, GABA, and dopamine to prevent their deficiency. Healthy levels of these brain chemicals naturally create the feelings of relaxation and calmness, especially during stress.
  • Because of its positive effects on brain chemistry, L-theanine can help prevent excessive nerve impulse transmission which has been linked to convulsive disorders, agitation, anxiety, and hyperactivity in children.
  • L-Theanine may benefit people who are always on the go and are always stressed out from a fast paced lifestyle. It helps promote adequate sleep periods that can help the body rejuvenate and recharge after a long day at work or at home.  
  • This amino acid may help women achieve a healthier mood during PMS and menopause, during which they usually suffer from discomforts and mood swings.
  • By promoting adequate rest periods, L-theanine can help ensure that the body has enough energy needed for maximum functioning and disease prevention.
  • Pure theanine can support mental clarity and enhances concentration. While supporting calmness and relaxed state, L-theanine does not cause sedation but instead promotes mental sharpness.
  • Regular users of caffeinated products will greatly benefit from the inhibitory action of L-theanine in controlling the stimulatory effects of caffeine. L-theanine may help normalise blood pressure and provide natural immune support.

Source Naturals L-Theanine is a special formulation of L-theanine, an amino acid that works primarily on the neurotransmitters of the brain. Neurotransmitters are chemicals released in the brain cells or neurons responsible for many vital body processes. L-Theanine acts on the neurotransmitter gamma-aminobutyric acid (GABA), serotonin, and norepinephrine specifically. L-Theanine acts by increasing GABA levels created by the body and distribute it to the parts of the brain. GABA is known for naturally producing a calming feeling and achieving a relaxed state. On the other hand, L-theanine can also boost serotonin production and its distribution in the bloodstream. Serotonin is responsible for elevating the mood and controlling negative emotions like anger. When there are higher levels of serotonin in the body, it may counteract depressed mood and agitations and promote more positive emotions. While L-Theanine can increase both GABA and serotonin, it can also further help the body by decreasing the neurotransmitter Norepinephrine. Norepinephrine is released when the body undergoes a “fight or flight” status. During this time, there is a hyperactivity of some body systems including the heart and its blood vessels. Increased norepinephrine causes higher blood pressure levels. As an L-theanine supplement, Source Naturals L-Theanine may help balance the amounts of these three brain chemicals for mental sharpness, relaxed state, and calmness.