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Smart Caffeine®

For Clean Energy With No Crash
Rated 4.7 out of 5
217 Ratings
Regular price $19.95 List price



  • For Clean Energy With No Crash
  • No Jitters or Anxiety
  • Power Through Your Day With Heightened Senses

Clean Energy Boost With No Crash

SmartCaffeine will give you long-lasting energy without the jitters, anxiety, or a crash.

People use SmartCaffeine every day as a study aid, pre-workout, coffee replacement or whenever they need a lift.

With just two all natural ingredients SmartCaffeine works with any diet.

Be attentive when you need to be

Clean energy state perfect for creative or analytical work

SmartCaffeine will put you into an alert yet calm state that's ideal for the productivity you need to accomplish your goals - mental or physical.

Add SmartCaffeine to your morning routine or anytime you need a boost to power through your day with heightened senses.

Caffeine and L-Theanine for Clean Energy and No Crash

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 is a natural nootropic stack made from coffee and green tea to support a relaxed but alert state that is ideal for productive, focused activity - mental or physical.

The energy and motivation from the Caffeine is harnessed and smoothed over with L-theanine. The result is a focused energy state with improved cognitive function [14] that’s perfect for creative or analytical work. Best of all, there’s no jitters, no crash and no anxious feelings. [15]

Thousands of people use Smart Caffeine every day as a study aid, pre-workout, energy drink replacement or whenever they need a lift.

There have been many recent clinical trials conducted by various organizations proving that the combination of L-Theanine and Caffeine in our same 2:1 ratio 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]

New research from Korea has shown the amino acid L-Theanine (commonly found in tea) inhibits the excitatory effects of caffeine (you'll be less jittery) and "low doses of L-theanine can partially reverse caffeine-induced reductions in Slow Wave Sleep (the transition from wakefulness to sleep); however, effects of L-theanine on caffeine-induced insomnia do not appear to increase dose-dependently."

L-Theanine can reduce jittery effects of caffeine and helps prevent sleeplessness caused by caffeine consumption. [6]

Another study from neuroscience labs here in the US found that L-Theanine in combination with caffeine had positive effects on both tonic (background) and phasic (event-related) cognition.

In this study, participants were dosed placebo, caffeine only and caffeine + L-Theanine. The participants that received the combination of caffeine + L-Theanine demonstrated significantly greater increases in mental performance than both the caffeine-only and the placebo groups. [7]



Caffeine is the world’s most popular natural cognitive enhancer. By using the purest form available, we are able maximize its positive effects on focus, alertness and energy. [12]


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. [13]

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.

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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 and ingredient suppliers in an open source format.

Learn About Our Commitment To Transparency

100% Happiness Guarantee

If for whatever reason you're unsatisfied with your Natural Stacks supplements, you can keep the full bottle on us and we'll refund your money. Anything after the first bottle, we'll ask that you return for a refund.

User Reviews

average rating 4.7 out of 5
Based on 217 ratings
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97% of reviewers would recommend this product to a friend
168 Reviews
Rated 2 out of 5
Review posted

no help

took them as directed and didn't feel anything different, did it for 3 days and thought it may take a day or two. but didn't....

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Rated 5 out of 5
Review posted

Great Mental Lift

I use these on an as-needed basis. When I'm really wiped or haven't slept enough the night before, I'll take one capsule and it really helps bring me "up" without it being a jittery crazy boost. It's smooth and level and helps get me through the afternoon.

Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 4 out of 5
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Rated 5 out of 5
Review posted

Smart Caffeine

Works like a charm, take it everyday, absolutely love it.

Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 4 out of 5
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Rated 4 out of 5
Review posted

Smart Caffeine

Smart Caffeine is a great nootropics staple. The combination of caffeine and L-Theanine has been proven to be synergistic in terms of cognitive enhancement. I've been enjoying this combo for a while, especially as a late afternoon bump in energy. Caffeine regardless is always going to have a crash afterwards. But the addition of L-Theanine seems to mellow out the curve. Less of the jitters at first, and less of the crash later. Being an EMT who needs to be up late, having the combination in capsule form is quick and effective. I do wish that Natural Stacks included varying ratios however as to titrate the effects. Currently the product is 100mg caffeine and 200mg L-Theanine. I would love to see micro-doses at 25mg Caffeine and 50mg L-Theanine. Maybe soon to come?

Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 3 out of 5
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Rated 4 out of 5
Review posted

Glad I took a chance

More energy more focus no side effects

Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 4 out of 5
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†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

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