Herbie Murray
L-theanine is an amino acid found in tea leaves, particularly green tea, and some mushrooms. It is also available in pill or tablet form. L-theanine is said to help ease anxiety, stress, and insomnia. It promotes relaxation and improves sleep quality. While there haven't been reported side effects from taking L-theanine, consuming large amounts of green tea can lead to gastrointestinal upset due to its caffeine content. The recommended dosage of L-theanine for sleep in adults is 200-250 milligrams (mg) daily, taken 30 to 60 minutes before bedtime. However, experts do not yet know the best dosage, and it's important to consult a healthcare professional before taking any new supplement, especially if you are taking other medications.
| Characteristics | Values |
|---|---|
| Form | Tea, tablet, pill, supplement |
| Dosage | 200-400 mg, 30-60 minutes before bedtime |
| Effect | Promotes relaxation, improves sleep quality, reduces anxiety, lowers blood pressure |
| Side effects | Limited data on side effects, may cause gastrointestinal upset, may interfere with other medications |
| Precautions | Consult a doctor, especially for children, pregnant or breastfeeding women, and those on medication |
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What You'll Learn
L-theanine dosage for sleep
L-theanine is an amino acid found in tea leaves, particularly green tea leaves, and some mushrooms. It is also available in pill or tablet form. It is said to help ease anxiety, stress, and insomnia. Research indicates that L-theanine could be beneficial for a good night's sleep, likely because it helps promote relaxation.
There is limited data available on L-theanine taken on its own. The U.S. Food and Drug Administration (FDA) classifies L-theanine as a food ingredient that is generally recognized as safe. However, the FDA does not review or regulate L-theanine products, meaning no one checks what's sold to ensure it's safe and effective. The FDA states that most adults can safely consume up to 400 milligrams of caffeine per day.
Experts do not yet know the best dosage of L-theanine as a natural sleep aid. However, studies suggest that taking 200 milligrams of L-theanine before bed may promote restful sleep. Other studies have shown that doses of 250 mg and 400 mg of L-theanine improved sleep in animals and humans. The recommended dosage for adults is 200 milligrams daily for four weeks. Most healthy individuals can safely take L-theanine in doses of up to 500 mg daily.
If you are taking L-theanine as a supplement, it is recommended to take it in the evening before going to bed and not pair it with any coffee or caffeinated beverage. It is also important to consult a healthcare professional before taking L-theanine, especially if you are taking other medications or supplements.
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Potential side effects
While L-theanine is generally considered safe and well-tolerated when taken at appropriate doses, there are some potential side effects to be aware of. Firstly, it is important to note that the U.S. Food and Drug Administration (FDA) does not review or regulate L-theanine products, so there is limited data available on its potential side effects. However, some mild side effects may include headache or sleepiness, especially at high doses. Additionally, consuming large amounts of green tea, which contains L-theanine, can lead to gastrointestinal upset due to its caffeine content. This is especially important for pregnant or breastfeeding women, who should limit their tea intake to avoid over-caffeination. Similarly, children should also follow dietary guidelines for caffeine consumption if consuming L-theanine through tea. Overall, it is recommended that individuals consult a healthcare provider to determine the appropriate dosage and avoid potential side effects.
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Interactions with other medications
L-theanine is generally considered safe for human consumption, but it may interact with some medications. It is important to consult a doctor about any current medications before taking L-theanine supplements.
First, L-theanine may lower blood pressure, so taking it alongside other medications that lower blood pressure might cause blood pressure to go too low. It is important to monitor your blood pressure closely if you are taking such medications.
Second, L-theanine may cause sleepiness and slowed breathing, so it should be used with caution if you are taking sedative medications. However, most research has not shown this effect.
Third, L-theanine may affect the levels of certain chemicals in the brain, such as serotonin, dopamine, and GABA. These chemicals influence mood, sleep, and emotion, so taking L-theanine with other medications that affect these chemicals may have an impact.
Fourth, L-theanine is known to be safe to take with melatonin. Additionally, it may help protect the kidneys from damage during the use of a chemotherapy drug called doxorubicin.
Finally, there is limited data available on the effects of L-theanine taken on its own, and the U.S. Food and Drug Administration (FDA) does not review or regulate L-theanine products. Therefore, it is important to consult a healthcare provider for guidance on dosage and potential interactions with other medications.
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Natural sources of L-theanine
L-theanine is a unique non-protein amino acid found in tea leaves and some mushrooms. It is a natural compound that is present in green tea, black tea, white tea, and oolong teas. Green tea is a top source of L-theanine, offering numerous health benefits. It contains more L-theanine than black tea, which is also a great source. Assam, Earl Grey, Darjeeling, and Matcha tea are also good sources of L-theanine. Matcha is made from green tea leaves grown in shade, which increases its L-theanine content.
Tea is the second most widely consumed beverage in the world after water. It is known to be a rich source of flavonoid antioxidants and contains L-theanine, which may modulate aspects of brain function in humans. Evidence from human electroencephalograph (EEG) studies shows that it has a direct effect on the brain, increasing activity in the alpha frequency band, indicating that it relaxes the mind without inducing drowsiness. However, this effect has only been established at higher doses than typically found in a cup of black tea (approximately 20mg).
A 2021 study focusing on the effects of L-theanine on cognitive function in older adults found that regular intake of theanine in the form of green tea for 12 weeks improved participants' attention and cognition. Researchers concluded that attentional function and working memory appeared to improve with L-theanine consumption. However, they also stated that more research is needed to determine how L-theanine might affect a person's attention and focus. Several studies have suggested that L-theanine could help people relax before bedtime, get to sleep more easily, and sleep more deeply.
L-theanine is also available in supplement form, usually as 200-mg tablets. Experts consider L-theanine to be generally safe for people to take as a supplement, but it is recommended that people consult a doctor before taking these supplements to get advice on dosage. Published studies suggest that taking 200 milligrams of L-theanine before bed may promote restful sleep.
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L-theanine for children
L-theanine is an amino acid found primarily in green and black tea and some mushrooms. It is also available in pill or tablet form. It is said to help ease anxiety, stress, and insomnia. Research indicates that L-theanine could be beneficial for a good night's sleep, possibly because it helps promote relaxation.
There is limited data available on L-theanine taken on its own. The side effects of L-theanine are not well understood, and there is no conclusive research on a safe dosage for children. However, some studies suggest that taking 200 milligrams of L-theanine before bed may promote restful sleep. Another study found that doses of 250 mg and 400 mg of L-theanine improved sleep in humans.
L-theanine is generally recognized as safe by the U.S. Food and Drug Administration (FDA). However, consuming large amounts of green tea can lead to gastrointestinal upset due to the caffeine content. It is important to consult a healthcare provider for guidance on dosage, especially for children.
Some studies have examined the effects of L-theanine on children with ADHD. One study found that L-theanine improved sustained attention and overall cognitive performance in children with ADHD, possibly by decreasing mind wandering. Another study looked at the effects of L-theanine on boys aged 8 to 12 years old with ADHD. The boys who took L-theanine had longer, more restful sleep after six weeks.
For children aged 3 years old, one gummy containing L-theanine is recommended daily. For children aged 4 years and above, two gummies daily are suggested. However, it is important to consult a healthcare professional for specific recommendations.
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Frequently asked questions
The recommended dosage of L-theanine for sleep in adults is 200 milligrams (mg) daily for four weeks. However, there is limited data available on L-theanine taken on its own. The FDA considers L-theanine generally safe in doses up to 250 mg per day, and most healthy individuals can safely take up to 500 mg daily.
L-theanine is an amino acid found in tea leaves, particularly green tea. It promotes relaxation and improves sleep quality by boosting levels of GABA and other calming brain chemicals. It also reduces levels of "excitatory" brain chemicals linked to stress and anxiety.
L-theanine is considered relatively safe for most people. However, it may interact with certain medications, including blood pressure medication and cancer medications. It is best to consult a healthcare professional to determine the appropriate dosage and to ensure it is safe to take with any current medications.
