Other compounds

Caffeine and L-theanine

Also called: theanine caffeine

A combination for calm focus.

Why people take it
Focus.
What the evidence says
Small studies suggest better attention.
How it is usually taken
Usually 50 to 100 mg caffeine with 100 to 200 mg L-theanine.
Be careful
Counts towards your caffeine limit.
Medicines it can interact with
As for caffeine.

Other other compounds

Alpha-lipoic acidResveratrolQuercetinPterostilbeneNMNSpermidineFisetinPQQSulforaphaneDIMDHEAMelatoninCannabidiol (CBD)Hemp seedBee pollenRoyal jellyPropolisManuka honeyChlorophyllWheatgrass

Common questions

What is Caffeine and L-theanine?

A combination for calm focus.

Why do people take Caffeine and L-theanine?

Focus.

Does Caffeine and L-theanine work?

Small studies suggest better attention.

How much Caffeine and L-theanine do people take?

Usually 50 to 100 mg caffeine with 100 to 200 mg L-theanine.

Is Caffeine and L-theanine safe?

Counts towards your caffeine limit.

Does Caffeine and L-theanine interact with medicines?

As for caffeine.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.