Compare every L-Theanine product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Amino acid found in tea, promotes calm focus
We rank L-Theanine by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
What it is
L-Theanine is an amino acid, which is a building block used by the body to make proteins. It is found naturally in tea leaves.
Why it's used
It is used to promote a state of calm focus. This means it helps the mind feel relaxed without making the person feel sleepy.
How it's made
To make this supplement, companies extract the compound from tea leaves or produce it through fermentation. This process involves using specific bacteria or yeast to create the amino acid in large quantities, which is then purified into a powder for capsules.
What it typically costs
This ingredient is mid-range in price. This is because the manufacturing process is more involved than simple minerals, but there is enough global supply and competition to keep it from being expensive.
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.
How does Suppio calculate the best-value L-Theanine?
We rank L-Theanine by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Are these prices verified?
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
How often are L-Theanine prices updated?
Prices across our retailer network are refreshed at least daily.