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Smart Caffeine®



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Smart Caffeine is a highly effective combination of L-theanine and Caffeine. L-theanine is a natural amino acid found in green tea that removes the undesirable side effects of caffeine, creating long-lasting energy and attention without jitters, anxiety, or a crash.

The benefits include:

  • Increased focus and alertness

  • Improved cognitive function

  • Enhanced short-term memory retention

  • More ability to ignore distractions

  • No overstimulation

Smart Caffeine creates a relaxed yet alert state that is ideal for focusing and thinking clearly.


Smart Caffeine creates a relaxed but alert state, that is ideal for productive, focused activity.

Smart Caffeine


Natural Caffeine

Caffeine is the world’s most popular natural stimulant. By using the purest form available, we are able maximize its positive effects like increased focus, alertness and energy.

L-theanine From Green Tea

L-Theanine is a naturally occurring amino acid with benefits that include mental relaxation, reduced stress, improved working memory, enhanced learning and increased alpha brain wave activity.

Focused Energy Without The Jitters

The energy and motivation from the Caffeine is harnessed and smoothed over with L-theanine. The result is a focused energy state that’s perfect for creative or analytical work. There’s no jitters, no crash and no anxious feelings.

"Smart Caffeine gives me energy at work all day along"

"I used to drink at least two coffees, sometimes three just to make it through the day. Now I have completely replaced my coffee dependency with SMART CAFFEINE. It's better, healthier, and there are no jittery side effects." - Alex Gould, Business Development at

Being tired or drained is simply not fun, especially if you want your brain working at its highest performance level.

That's why caffeine is consumed by millions worldwide.  It's an efficient natural stimulant that is well tolerated by many people, and Caffeine can definitely give you a nice edge on your energy levels. Numerous studies have shown that Caffeine supplements increase energy and concentration. [1]  

But it's not the type of energy and concentration you want for productivity.

On its own, Caffeine is not a great cognitive enhancer. Users often experience a jittery or anxious mental state followed by a crash, especially in people that have built up a tolerance. Drinking a sugary coffee or energy drink doesn't provide the type of energy and concentration you need to get things done. That's why we include L-theanine (L-tay ah neen) in SMART CAFFEINE™.  It's a naturally occurring amino acid with benefits that include mental relaxation, reduced stress, improved working memory, enhanced learning, and perhaps most importantly, increased alpha brain wave activity. [2]

Independently, Caffeine and L-Theanine have somewhat polar effects on the mind and body. However when the two are combined the effects do not simply negate one another. Instead they work together very synergistically, allowing the user to fully benefit from the positive aspects of both compounds without the negative side effects. The energy and motivation from the Caffeine is harnessed and smoothed over with L-theanine. 

This Natural Stack provides a clear and focused energy feeling, rather than the short-lived stimulant rush of Caffeine by itself.

Many scientific studies have shown that SMART CAFFEINE's ingredients, Caffeine and L-theanine, have the following benefits when taken together; increased focus and alertness [3], improved cognitive function [4], enhanced short-term memory retention [5], more ability to ignore distractions [6], no overstimulation [7].

Quick Facts:

  • L-theanine and Caffeine is the #1 recommended beginner's Nootropic stack at the excellent r/Nootropics community on
  • L-theanine (y-glutamylethylamide) is found almost exclusively in the tea plant. Some teas have more than others. The average green tea drinker consumes about 20 mg of L-theanine a day. That's why people may feel relaxed, calm, and focused after drinking several cups of tea. However you would have to drink many cups of tea to reach most desired nootropic effects of L-theanine.





Suggested Use: take a serving of 1-2 capsules whenever focused energy is desired. Avoid use in the evening. Total daily dosage should not exceed 6 capsules.

SMART CAFFEINE can be taken daily, however we advise taking 1-2 days off per week (weekends for example).

U.S.A manufactured in a GMP facility. Natural Stacks proudly uses only the highest quality ingredients.

There have been many recent clinical trials conducted by various organizations proving that the combination of L-Theanine and Caffeine increases the ability to focus without the over stimulating effects of Caffeine alone:

A recent study from The Netherlands confirmed that "The combination of L-Theanine and Caffeine improves the cognitive performance and increases subject alertness." and that the combination "helps to focus attention during a demanding cognitive task." [1]

The Cognitive Neurophysiology Laboratory in New York conducted testing for 4 days on volunteers from the age of 21 and 40 and found that L-Theanine and Caffeine in combination positively affect human cognition and caused measurable increases in alpha brain waves - the brain waves associated with alertness. [2]

A UK-based study published in Nutritional Neuroscience found that the combination of L-Theanine and caffeine improved both speed and accuracy of performance when switching between tasks (multi-tasking) and reduced susceptibility to distractions during a memory task. The researchers summarized: "These results replicate previous evidence which suggests that L-Theanine and caffeine in combination are beneficial for improving performance on cognitively demanding tasks." [3]

A Dutch study gave participants L-Theanine and caffeine in the same 2:1 ratio that Smart Caffeine contains, the asked the participants to complete 2 attention tasks at 10 and 60-minutes after ingestions. The researchers stated that "The results support previous evidence that L-theanine and caffeine in combination can improve attention." [4]

A review of multiple studies published by the School of Psychology in Australia concluded that "L-theanine may interact with caffeine to enhance performance in terms of attention switching and the ability to ignore distraction; this is likely to be reflective of higher-level cognitive activity." [5]



What is Smart Caffeine?

Smart Caffeine is simply a combination of two natural ingredients (Caffeine Anhydrous and L-theanine) which have been carefully sourced for purity.

What is caffeine anhydrous?

Caffeine is the energizing compound typically found in many popular drinks like coffee, tea, and soft drinks.  Caffeine Anhydrous is the pure powdered form of caffeine extracted from natural sources.  Its absorbed faster by the body compared to caffeinated drinks and has been shown to give a bigger boost of energy. Another benefit of Caffeine Anhydrous is that you can accurately track your dose.  Smart Caffeine contains 100 mg of Caffeine Anhydrous in each capsule.

Is Smart Caffeine vegan or vegetarian?

Yes, Smart Caffeine is vegan.

I’m very sensitive to caffeine. Can I take Smart Caffeine?

Most likely. We're not doctors and you should talk to your doctor about this. Everyone responds differently to caffeine, but research has shown that the L-Theanine in our Smart Caffeine reduces “jitteryness”. The caffeine dose of one capsule is also pretty low (100mg).

Can I open the Smart Caffeine capsules and mix with my BCAA Drink?

Yes you can open the SC capsules and mix the contents into a drink.  However, caffeine powder is very bitter and it may not taste good.

Is there a money-back guarantee?

Yes! All orders purchased through are backed by our 30-day 100% money back guarantee from the date of purchase. If in the unlikely event you are not completely satisfied with Smart Caffeine, you can email our support desk for an RMA form and Natural Stacks Inc will refund your order after bottles are returned (shipping & handling charges are not refundable).

Dedication to quality

Natural Stacks formulas contain premium ingredients which are carefully selected solely on the basis of quality and purity. We actively seek out the most bioavailable forms of each ingredient, and avoid the cheap synthetic forms used by the majority of supplement companies.

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Open source

Most companies use "proprietary blends" so they don't have to tell you the amount of each ingredient in their formulas. At Natural Stacks we believe it's your right to know exactly what you're putting into your body. We proudly publish our innovative formulas in an open source format.

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Money back guarantee

If for whatever reason you're unsatisfied with your Natural Stacks, you can return the product within 30 days for a full refund. We also provide actionable tips on our blog and support in our forum for you to maximize your performance with our premium products.

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