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10 Best L-Theanine Supplements for 2019

If you’re looking for the best L-Theanine supplements to buy this year, then you’ve come to the right place

You can also get more info by jumping to our L-Theanine Supplements Guide.

Top 10 L-Theanine Supplements

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#1 Now-foods-L-theanine-s Now Foods L-Theanine Get it on Amazon
#2 Country-Life-L-Theanine-s Country Life L-Theanine Get it on Amazon
#3 Doctors-Best-Suntheanine-L-Theanine-s Doctor’s Best Suntheanine L-Theanine Get it on Amazon
#4 Source-Naturals-L-Theanine-s Source Naturals L-Theanine Get it on Amazon
#5 Solaray-L-Theanine-s Solaray L-Theanine Get it on Amazon
#6 Solgar-L-Theanine-s Solgar L-Theanine Get it on Amazon
#7 Thorne-Research-Theanine-s Thorne Research Theanine Get it on Amazon
#8 Pure-Encapsulations-L-Theanine-s Pure Encapsulations L-Theanine Get it on Amazon
#9 Sports-Research-Suntheanine-L-Theanine-s Sports Research Suntheanine L-Theanine Get it on Amazon
#10 Bluebonnet-Nutrition-L-Theanine-s Bluebonnet Nutrition L-Theanine Get it on Amazon

L-Theanine Products Compared

1.) Now Foods L-Theanine


Now Foods L-theanine supplement comes in a double strength formula. It includes Inositol, a relative of vitamin B that aids the brain and the central nervous system. Because these are more potent, they should not be taken caffeine as it may be overly stimulating. This product is as close to vegetarian as can be.

  • L-Theanine 200 mg
  • Inositol 100 mg
  • Vegetable Polysaccharide (capsule)
  • Silica
  • Magnesium stearate (vegetable source)
Vendor Price Comparison Link
amazonlogo-150x42  $21.49  Check Current Price

2.) Country Life L-Theanine


These pills contain 250% of the daily value of vitamin B6, which is a big help in absorption. The suntheanine is very pure and very effective. This particular brand has a very loyal following due to its price-effectiveness.

  • Vitamin B6 (as pyriodoxine hydrochloride) 5 mg
  • Suntheanine L-Theanine 200 mg
  • Cellulose (capsule shell)
  • Magnesium stearate
  • Silica
Vendor Price Comparison Link
amazonlogo-150x42  $17.00  Check Current Price

3.) Doctor’s Best Suntheanine L-Theanine


  • Suntheanine L-theanine 150 mg
  • Microcrystalline cellulose
  • Modified cellulose (vegetarian capsule)
Vendor Price Comparison Link
amazonlogo-150x42  $11.28  Check Current Price

4.) Source Naturals L-Theanine


Source Naturals L-Theanine are medium-sized capsules that take about 20 minutes to feel the effects from.

  • L-Theanine 200 mg
  • Microcrystalline cellulose
  • Gelatin (capsule)
  • Silica
  • Magnesium stearate
Vendor Price Comparison Link
amazonlogo-150x42  $13.39  Check Current Price

5.) Solaray L-Theanine


Solaray L-Theanine is another very effective product. It is suggested to take one of these every four hours with a meal.

  • L-Theanine 200 mg
  • Green Tea Leaf 100 mg
  • Vegetable cellulose capsule
  • Cellulose
  • Magnesium stearate
Vendor Price Comparison Link
amazonlogo-150x42  $14.55  Check Current Price

6.) Solgar L-Theanine


Solgar L-Theanine is free of gluten, wheat and dairy. These capsules are kosher and this product has gotten positive write-ups in both the Wall Street Journal and the Psychiatric Journal of Medicine.

  • Suntheanine L-Theanine (free form) 150 mg
  • Vegetable cellulose
  • Microcrystalline cellulose
  • Vegetable magnesium stearate
Vendor Price Comparison Link
amazonlogo-150x42  $17.20  Check Current Price

7.) Thorne Research Theanine


Thorne Research puts out a theanine supplement that has a very high amount of theanine in it. This is reflected in the price, making this one of the most potent and expensive theanine supplements.

  • L-Theanine 200 mg
  • Hypromellose (derived from cellulose) capsule
  • Microcrystalline cellulose
  • Leucine
  • Silicon Dioxide
Vendor Price Comparison Link
amazonlogo-150x42  $53.62  Check Current Price

8.) Pure Encapsulations L-Theanine


Pure Encapsulations is another very strong supplement, containing 200 mg.

  • L-theanine 200 mg
  • Hypoallergenic plant fiber (cellulose)
  • Vegetarian capsule (cellulose, water)
Vendor Price Comparison Link
amazonlogo-150x42  $45.30  Check Current Price

9.) Sports Research Suntheanine L-Theanine


Sports Research Suntheanine L-Theanine supplement is different from most. It is formulated using coconut oil and it is a softgel rather than a plastic capsule. These softgels are extremely popular in part because they are one of the most potent products. The gel make it more easily absorbable and it contains 200 mg, which is more than almost any other supplement.

  • Suntheanine L-theanine 200 mg
  • Organic virgin coconut
  • Organic yellow beeswax
  • Softgel capsule (kosher gelatin, kosher vegetable glycerin, purified)
Vendor Price Comparison Link
amazonlogo-150x42  $16.95  Check Current Price

10.) Bluebonnet Nutrition L-Theanine


Bluebonnet Nutrition L-Theanine comes in capsule form that is easy to swallow. It is derived from amino acid and is quite potent at 200 mg. Even better, it is one of the least expensive products on this list. These are kosher and contain no sugar, rice, yeast or gluten.

  • L-Theanine (free form) 200 mg
  • Kosher vegetable capsules
  • Vegetable cellulose
  • Vegetable magnesium stearate
Vendor Price Comparison Link
amazonlogo-150x42  $67.51  Check Current Price

L-Theanine Supplements Guide

What is L-Theanine?

Theanine come from tea leaves that originated in eastern Asia. The plant is an evergreen shrub that has dark green leaves and white fragrant blossoms. Theanine also can be found in certain type of mushrooms.

L-Theanine is a building block for proteins known as an amino acid that is found in green tea. It is known to make people feel more relaxed without any feelings of drowsiness. It is also proven to help blood to flow better and can help to lower blood pressure.

L-Theanine is frequently used to lower anxiety, and blood pressure.

There is no true recommended amount of L-Theanine to take every day. The general thought is that if it is being used to help anxiety, up to 250 mg is acceptable. Most supplements contain 150 mg. The biggest ones contain 200 mg.

Some L-Theanine products contain Suntheanine, which is a specific form of L-Theanine that stimulates alpha waves. Alpha waves are a type of activity in the brain that is associated with a relaxed but focused mentality. Many people prefer to buy suntheanine as there is a belief that it is more effective and bioavailable.

In general, Suntheanine supplements costs up to 25% more and it is unclear if it is more effective than L-Theanine. Studies have been done that have shown the difference to be negligible.

What to Look for in a Good L-Theanine Supplement

A lot of the L-Theanine supplements are very similar and all of the ones on this list are effective. The main things to look at is the price and the dosage. Some capsules contain 50 mg, while others have up to 200 mg. People with slight anxiety or sleeping issues should stick to the lower end. People with moderate anxiety should take 200 mg. If you are suffering from severe anxiety, a doctor should be consulted. L-Theanine might not be enough.

When you open the bottle, the pills should not smell. If they do, they should smell similar to tea. Any other odor means you might want to avoid taking the supplement, because it may not contain the advertised ingredients. Some companies use fillers that can dilute the product to make it ineffective. Your best bet is to look into the supplements on this list, as each of them has a proven reputation for offering a quality product.

Always speak with a medical professional or doctor before taking any supplements. Always read the product label for instructions and directions.

Taking L-Theanine

L-Theanine capsules and softgels should be taken during or after a meal. Consuming them on an empty stomach might cause you to feel a bit ill. Some people open the capsules and pour the power into a drink. This can work with water or orange juice, but should not be put in caffeinated drinks. Ingesting caffeine and L-Theanine at the same time can lead to unpleasant results.

Keep in mind that the effects won’t kick in right away. It can take a few days for it to start to work. If you are taking them for sleeping problems, they shouldn’t be taken right before bed as it may actually make it difficult for you to fall asleep. These supplements are best taken in the morning or the early afternoon.

It cannot be overstated that L-Theanine should not be taken with any kind of anti-anxiety or anti-depressant medication. Using two products that both affect serotonin levels can lead to very unstable behavior. Any time there is any doubt what should be done when taking L-Theanine, consult a doctor. These supplements are truly potent and need to be handled with care.

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