L-Theanine - 250mg / 400mg Capsules or Powder


"One of the purest I've tried"

We wanted to offer you the highest quality of L-Theanine you would ever find. The purest of powders and the highest strength capsules you could get. After working with a number of suppliers, we'd like to offer you our high strength 400mg capsules, 250mg capsules and our pure L-Theanine powder itself!

Pure and 3rd party lab tested

As well as being tested for purity by a 3rd party lab, we turn the pure powder into capsules in our very own ISO licensed UK facility. We want you to notice the difference in quality - so that's why we ensure tip-top quality control standards and only work with our hand-picked, top-grade suppliers.

Delivered in 1-3 days to your door

We will send this out to you the same day if you order before 1pm. Delivery typically takes 1-3 days if you live in the UK or 3-7 days if you live in Europe.

100% money-back guarantee

If you don't like it, you don't have to pay for it. This is pretty rare though - you can read our verified customer reviews for L-Theanine below (and read our site-wide reviews) to know that we will only offer you the highest quality of these supplements possible.

How much L-Theanine Should I Take?

How Relaxed Are You?

As a starting point, I always suggest 200-300mg per day.

But, know that there's no real "limit" to how much L-Theanine you should take.

It's essentially the same as drinking Matcha Green Tea (L-Theanine is the relaxing amino acid found in it). It's pretty healthy.

If you want to combine it with coffee (a favourite productivity stack amongst bio-hackers), you're going to want to take about 200mg of L-Theanine per cup of coffee. That's the recommended 2:1 ratio, since a standard Costa coffee contains about 100mg of caffeine.

A 2-in-1 Capsule Combining L-Theanine and Caffeine

This done-for-you stack lets you easily "kickstart" your working day with one of the most popular productivity stacks around.

Each capsule contains 250mg of L-Theanine and 100mg of Caffeine.

Combine L-Theanine with Rhodiola Rosea instead of Caffeine for even GREATER mental endurance and energy!

This is a lesser known productivity stack - but one that I would highly recommend for energy.

Rhodiola Rosea is an arctic herb which was was used in secret by the Soviet Army and has been covered by numerous studies. Most people report a lift in energy that lasts for 4 hours and improvements in endurance.

Check it out - just like caffeine, it's a stimulant, so it combines extremely well with L-Theanine to get a balanced "calm focus" kind of feeling.

Customer Reviews

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Great products, a bit long the delivery small catalog

It took quite a month to receive the order, nonetheless the products are made of good quality. the catalog of products is quite small.

Miran V.


I like it very much everyday good to calm your mind

Anthony G.
United Kingdom

Good quality Theanine

Happy as always to buy from Focus suppliments. Easy to checkout on the website and I trust the quality of the products.


Theanine supply

Excellent service, package arrived on time.

zoe p.

L-theannine powder

excellent service, product exactly as described...very happy customer :-)