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L-Theanine Supplement 99% – Calm, Focus, Brain


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Premium L-theanine 99% is an amino acid well-known for being found in tea leaves (Camellia sinensis). The dry weight of tea leaves contain 1–2% of the amino acid. The most common use of the amino acid today is as a dietary supplement to support restful sleep, lower blood pressure, promote calmness and relaxation, and to enhance focus and concentration.


L-Theanine Supplement 99% is an amino acid well-known for being found in tea leaves (Camellia sinensis). The dry weight of tea leaves contain 1–2% of the amino acid. The dry weight of tea leaves consist of 1–2% of the amino acid. The substance has a white colour and it is soluble in water. The taste of it is tea-like with a hint of sweetness, as it is an integral part of tea flavour. In Japan the substance is sometimes used to improve the content and taste of tea.

The most common use of the amino acid today is as a dietary supplement to support a restful sleep, lower blood pressure, promote calmness and relaxation, and for enhancing focus and concentration.

Stress Reduction and Anxiety

L-Theanine is recognized for its ability to induce relaxation without causing drowsiness. It is often used to help ease stress, to relax, unwind, and appears to be especially effective for people with anxiety. Various studies have shown that it can decrease anxiety symptoms and reduce the levels of the stress hormone cortisol levels. Likewise it promotes the production of calming neurotransmitters that modulates brain waves, such as GABA.

Sleep Quality

The calming effects of L-theanine extend to its positive impact on sleep. It may help individuals fall asleep more easily, improve sleep quality, and contribute to a more restful night’s sleep. The amino acid may promote relaxation and sleep by increasing GABA levels in the brain. GABA is an inhibitory neurotransmitter that promotes calmness and sleepiness. Research supports that theanine could be beneficial for a good night’s sleep as it greatly improved sleep at dose ranging from 250 mg to 400 mg.

Learning and Cognition

Several studies have shown that L-theanine can enhance attention, processing speed, working memory, and focus without the jitteriness associated with stimulants. Additionally, it may enhance creativity and problem-solving skills. One study found that small amounts of theanine and caffeine (100 mg, 50 mg) helped teenagers to focus on demanding tasks.

Immune System

Preliminary studies suggest that L-theanine may enhance the immune system’s response to infections, potentially boosting overall immune function. Some research indicate the compound can decrease the incidence of upper respiratory tract infections and help to reduce inflammation in the intestinal tract.


Theanine has protective effect on neurons and may inhibit neuron death from transient cerebral ischemia. The death of nerve cells is closely related to the excitatory neurotransmitter glutamate. The cell death occurs when glutamate levels are too high, which is often caused by Alzheimer’s disease.

Blood Pressure

Some studies suggest that L-theanine may have a mild blood pressure-lowering effect, promoting cardiovascular health. It helps counteract the stimulatory effects of caffeine, often found in tea, resulting in a more balanced impact on blood pressure.


Research has explored the anti-inflammatory potential of L-theanine. By modulating inflammatory pathways, it may offer benefits in managing inflammatory conditions and promoting overall immune system health.


L-theanine has been studied in the context of weight management. It may support weight loss efforts by reducing stress-related eating and promoting a sense of calm, preventing emotional overeating.

Hyperactivity / ADHD

Some studies suggest that L-theanine may be beneficial for individuals with ADHD. It can have a calming effect without causing sedation, potentially helping manage symptoms associated with attention disorders.


By influencing neurotransmitters like serotonin and dopamine, L-theanine may contribute to mood regulation. It has been investigated for its potential in alleviating symptoms of depression and supporting a positive emotional state.

Potentially Anticancer

The supplement may reduce the occurence of some tumors and affect anticancer drugs. One study found that women diagnosed with ovarian cancer that drank one or more cups of green tea a day lived longer than those that did not. The mechanism may be that inhibit the invasion of cancer cells, which is the necessary way for cancer cell proliferation. It also appears to reduce side-effects of some antitumor drugs by regulating the level of lipid peroxidation, reducing the decrease of white blood cells, and bone marrow cells.

Antioxidant Properties

L-theanine exhibits antioxidant activity, protecting cells from oxidative stress. This can contribute to overall health and may play a role in preventing chronic diseases associated with oxidative damage.

Suggested use

The suggested daily dose of l-theanine is 250 mg to 1,500 mg daily.


L-Theanine supplement 99%. Synthesized from bacterial cultures.


The various effects are not guaranteed and results may vary due to several factors between different people.

We strive to ensure the accuracy of the information provided by the manufacturers and recommend that you read all labels and warnings. However, the information is not a substitute for, nor does it replace, professional medical advice, diagnosis, or treatment.

Weight (Bag)

1000g (35.3oz), 100g (3.5oz), 200g (7.1oz), 500g (17.6oz)


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