Smart Caffeine with L-Theanine by Natural Stacks


Reach a state of alertness whilst remaining relaxed with Smart Caffeine with L-Theanine by Natural Stacks – a long-lasting energising solution for people who want to enjoy the benefits of caffeine without any jitters or caffeine crash.

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1-3 day UK delivery 1-3 day UK delivery
Over 45,000 happy customers Over 45,000 happy customers



Smart Caffeine is the daily focus supplement choice for thousands of people. It can be used as a study aid, an energy drink replacement, for workouts or any other activity that requires focus and a strong attention span.

Each container contains 60 individual vegetable capsules that can be used throughout the day whenever you feel the need to focus. It’s a great choice for anybody who wants enhanced alertness without having to drink coffee.

Why Choose Smart Caffeine with L-Theanine from Natural Stacks?

Smart Caffeine is a nootropic dietary supplement formulated with natural coffee and green tea ingredients designed to support alertness without the negative side effects associated with drinking coffee making it ideal for helping you navigate challenging tasks whether they’re mental or physical.

The 2:1 combination of caffeine and L-Theanine (derived from green tea) results in a state of focus and enhanced attention whilst remaining relaxed and calm. Essentially, it provides all of the advantages of caffeine but removes the coffee jitters, the energy trough and potential anxiety that can come with drinking coffee making it the perfect solution for when you need a boost in your professional life or social circle.


Various studies have been carried out on the benefit of combining caffeine and L-Theanine which have shown that it can increase our ability to focus without the overstimulation associated with caffeine on its own.

A recent Netherlands study found that “The combination of L-Theanine and Caffeine improves cognitive performance and increases subject alertness.” and that the combination “helps to focus attention during a demanding cognitive task.”

In a similar study, The Cognitive Neurophysiology Laboratory in New York conducted testing for 4 days on volunteers from the age of 21 and 40 and concluded that the combination of L-Theanine and Caffeine positively affect human cognition and caused measurable increases in alpha brain waves – important brain waves associated with both alertness and calmness.

L-Theanine has been shown to reduce the negative side effects that caffeine can have on the body such as jitters and caffeine slumps that result in fatigue making it the perfect leveller for Smart Caffeine.[1]

Expand Your Mind


Enhanced focus and alertness
Enhanced focus and alertness
Enhanced short-term memory retention
Enhanced short-term memory retention
Improved cognitive function
Improved cognitive function
No overstimulation
No overstimulation


  • UK based orders deliver 1-3 days after dispatch
  • Orders for outside of the UK deliver 5-7 days after dispatch

Additional information

Weight 0.085 kg