Tea is a beverage which has had widespread popularity for thousands of years. Green tea in particular has experienced a massive growth in popularity in recent years for a variety of reasons. One of the most striking is the wide range of health benefits it’s been linked to.
This has led to the scientific exploration of the constituents of tea. Research has highlighted l-theanine as one of the most beneficial ingredients.
In this article I’m going to take a closer look at l-theanine and its health benefits.
Nutricost L-TheanineClick for price
- Nisim International
Nature's Trove L-TheanineClick for price
- L-Theanine 200mg promotes relaxation without drowsiness. Also Restores a sense of calm.
- Found naturally in green tea
- Natural Ingredients - Good Health from the Source!
Superior Labs L-TheanineClick for price
- ABSOLUTE PURITY - ZERO SYNTHETIC ADDITIVES, FILLERS, HEAVY METALS, ADULTERANTS - You will never see unnecessary additives...
- UNQUESTIONABLE QUALITY - ALL PRODUCTS PRODUCED IN 3rd PARTY CERTIFIED NSF CERTIFIED FACILITIES - All dietary supplement...
- HEALTHY MOOD, SLEEP, ANXIETY, CALMING - Powerful formula containing 250 mg and 90 vegetable capsules of pure L-Theanine.
Source Naturals L-Theanine TabletsClick for price
- Helps reduce anxiety
- Unique amino acid found almost exclusively in the tea plant
- Increases dopamine and GABA levels in the brain
NOW L-TheanineClick for price
- Stress Management*
- Double Strength
- Supports Cardiovascular Function*
What is L-Theanine?
L-theanine is a type of protein found in green and black tea, and also some species of mushroom native to some regions in the US. As a non-essential amino acid, L-theanine is not an essential component in the human diet, but if present it can have some surprising benefits.
Although green tea has been heralded as the hero of teas, when it comes to l-theanine, it’s actually black tea which contains the most – at 25 mg per cup, over three times as much as green tea. (source)
Who Needs L-Theanine?
Who needs l-theanine? Apparently, anyone who suffers from stress or uses their brain! The benefits of l-theanine are so far reaching that most people might want to consider adding it to their diets.
Reduces Stress and Anxiety
Research has shown that at a dose of 200 mg per day, l-theanine can reduce tension and increase relaxation and calmness. (source) It directly influences the nervous system without the drowsiness that comes with many other stress-relieving medications.
While it is not a sedative, l-theanine has been shown to improve the quality of sleep through reducing stress and anxiety. (source)
Clinical depression is an illness that affects one in ten people during their lifetimes. Scientific studies have observed numerous benefits associated with the use of l-theanine for depression. Improvements were observed in the symptoms of anxiety, sleep disturbance and cognitive dysfunction. (source)
Recent research suggests l-theanine can alleviate airway inflammation in asthma. (source)
L-theanine has been shown to enhance brain function by improving the way information is processed and improving attention span. (source)
L-theanine also protects the neurological system against stress-related damage. (source)
Looks After Your Heart
Research has shown l-theanine is effective in reducing blood pressure. This reduces the physical stress placed on the heart and blood vessels, keeping your body’s transport network running smoothly. (source)
Some research indicates l-theanine has potential as an anti-cancer agent, having shown that it can significantly slow down human tumor growth and make other anti-cancer medications more effective. (source)
L-theanine has been shown at a dose of 10 mg per kilo of body mass to help heal gastric ulcers. Gastric ulcers affect more than one in ten adults in the US and can have serious complications if left untreated. (source)
Strengthens The Immune System
L-theanine taken regularly has proven to increase the size of the spleen, an organ which acts as a filter for the blood and an important part of our immune system. (source)
Why Not Just Drink Tea?
With each cup of black tea containing around 25 mg of l-theanine, one
person would need to regularly consume around ten cups of tea per day to get the same intake as many of the supplements available. This amount of tea also contains a lot of other ingredients, such as caffeine, the ingestion of which is avoided when taking an l-theanine supplement.
Precautions For Use
As l-theanine reduces blood pressure, anyone with low blood pressure or anyone taking antihypertensive medication should seek medical advice before including l-theanine in their diet.
L-theanine has also been shown to increase the potency of some chemotherapy medication and so should only be used under medical supervision.
As l-theanine counteracts medication intended to stimulate the nervous system, anyone taking medication such as epinephrine, or medication for depression should seek medical advice.
At present, there is insufficient evidence to positively state that l-theanine is safe to use during pregnancy and breastfeeding, so many manufacturers advise against its use.
What is the Best L-Theanine Supplement Brand to Buy in 2019?
With many different brands of l-theanine on the market, it can be difficult to choose the right product for you. We reviewed five of the top brands currently on the market to help you make an informed decision. A high-quality product at a very reasonable price from a well-known company. Nutricost have every batch of their l-theanine independently tested for purity. The only downside we could find is that it contains gelatin, so is unsuitable for vegetarians and vegans. Nature’s Trove pride themselves on producing good quality supplements at low prices. Their l-theanine is no exception – users report great results and the price is excellent. Another pricier option, Superior Labs L-Theanine packs a good bang for your buck. It contains more l-theanine per capsule compared to the competition and most users report excellent results. A well-established company providing high quality supplements, the l-theanine supplement from Source Naturals is no exception. It’s on the pricier end of the products we looked at but it’s suitable for most diets and users report very fast results. Providing natural supplements for almost 50 years, Now is a well-established, trusted brand that produces a quality product at a very reasonable price.
Every batch is tested for purity
Made in USA
Many users report a noticeable, fast result
100% money back guarantee
Some users report a disoriented feeling after taking
Made in US
Certified kosher and vegetarian
Standard size capsule
Some users report acid reflux
Some users report capsules clump together, causing wastage
Made in USA
250 mg L-theanine per capsule
100% natural, no additives
Vegetarian and vegan
60 day no questions asked refund policy
Some users reported increased anxiety after taking
Vegetarian and vegan
Some users report feeling effects within 15 minutes
Some users report drowsiness or no effect
200 mg l-theanine
Also contains inositol (for healthy nervous system)
Product takes up to a week to show results
Some users report no effects and/or headaches
A high-quality product at a very reasonable price from a well-known company. Nutricost have every batch of their l-theanine independently tested for purity. The only downside we could find is that it contains gelatin, so is unsuitable for vegetarians and vegans.
Nature’s Trove pride themselves on producing good quality supplements at low prices. Their l-theanine is no exception – users report great results and the price is excellent.
Another pricier option, Superior Labs L-Theanine packs a good bang for your buck. It contains more l-theanine per capsule compared to the competition and most users report excellent results.
A well-established company providing high quality supplements, the l-theanine supplement from Source Naturals is no exception. It’s on the pricier end of the products we looked at but it’s suitable for most diets and users report very fast results.
Providing natural supplements for almost 50 years, Now is a well-established, trusted brand that produces a quality product at a very reasonable price.
My top pick from the products we reviewed is the Nutricost L-Theanine. At the lowest price of the products we reviewed, it provides excellent value for money. Each batch is tested for purity.
It is made in the USA at a GMP approved facility. It is soy, dairy and yeast-free, and the standard size capsule makes it easy to swallow.
The vast majority of users report good effects, and fast results, and with the addition of the company’s 100% money back guarantee, we think this product is a winner.