L-Theanine Capsules

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About L-Theanine Capsules

  • Promotes healthy rest and relaxation*
  • Supplements cognitive and respiratory health*
  • Alleviates the jittery effects of caffeine
  • Tested for dosage and purity

L-Theanine is an incredibly popular supplement for its many health benefits, but for some, measuring out the correct dosage for each supplementation can be a real pain. That’s why Powder City now offers L-Theanine in encapsulated form. It’s the same great product, just easier to manage and consume!

What is L-Theanine?

For many people who find it difficult to promote relaxation or unwind at the end of a long day, L-Theanine supplementation is an excellent method to help you relax and worry less. It is similar in structure and has many of the same effects as Glutamate, a neurotransmitter in the brain that is involved in learning and memory.* [1]

Benefits of L-Theanine

L-Theanine provides many benefits to those who choose to add it to their dietary supplementation. At normal doses, L-Theanine has also been shown to promote cognition, alertness, and attention.* [2]

There is further evidence suggesting that L-Theanine may have cellular health benefits, although this is still being studied. [3, 4] Lastly, many individuals choose to supplement L-Theanine with a form of Caffeine, as this combination has been shown to supplement cognitive speed and accuracy and promote healthy attention while switching tasks.* [3]

L-Theanine Dosage

The typical dosage for L-Theanine is one 200mg capsule once daily

Curated Reviews

“I really enjoy the mental boost of clarity and focus I get with L-Theanine and caffeine capsules, and the Theanine-only capsules really helps take the rough edge off of caffeine. I enjoy coffee, and since I don’t want to double-stack caffeine ingestion, the L-Theanine capsules are convenient to take 1-2 with coffee. It works well for me, though it’s more effective overall when I take it in conjunction with caffeine. No surprises there. This is my third order of L-Theanine caps, and I’ll continue to order it from Powder City.”– Trevor P

“I’ve made this part of my night and morning stacks. In conjunction with: 500 mg Magnesium Citrate 300mg Alpha GPC It has provided me the best sleep I’ve had in forever. Normally I wake up intermittently throughout the night, but with these I pretty much always sleep all the way through and wake up relatively refreshed. In the morning, I take it with a few other things, including bacopa, noopept, and coffee-based caffeine. It contributes pretty well, I think. I don’t experience any of the jitters I normally do from the coffee.”– Joshua B


  1. http://www.webmd.com/vitamins-supplements/ingredientmono-1053-theanine.aspx?activeingredientid=1053&activeingredientname=theanine
  2. http://www.ncbi.nlm.nih.gov/pubmed/18296328
  3. http://www.med.nyu.edu/content?ChunkIID=653856
  4. http://www.ncbi.nlm.nih.gov/pubmed/22422488″ target=

Additional Resources

Theanine Examine Page
Theanine Wiki

Additional information

Weight0.101 g


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