Smart Caffeine Review

Overall Rating



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.

If taken on its own, L-theanine is an effective mind-booster. And when combined with caffeine, the chances of experiencing pronounced synergistic effects are doubled (at least in theory). That’s the idea on which Smart Caffeine by Natural Stacks is based.

It’s a 2-ingredient stack – and that alone makes it pretty different from other highly sophisticated formulations. The beauty of having such a short list of ingredients is that the side effects can be minimized as well. So, to a large extent, everything about this futuristic powder seems perfect – or is it?

Smart Caffeine Overview

smart caffeine

Smart Caffeine is a product of Natural Stacks, a company that’s based in Seattle Washington. It was started in July 2013 by two awesome guys – Ben Hebert and Roy Krebs. Ben is a graduate of Business Management from the University of Baltimore while Roy holds an undergraduate from the Colorado College.

So what inspired these two to resign from their corner offices in the corporate world and to set up a nootropics company? Well, if their company’s mission is anything to go by, it’s the quest for “Better Brain and Better Life” that led them this way.

And since the two weren’t biochemists or brain health experts in the first place, they decided to put together a team that comprises product development, customer support, and quality assurance professionals. Lastly, they partnered with 3-rd party labs to ensure that every single batch from them is clean.

Long story short, there is a legitimate team behind the Smart Caffeine brand. What’s more? The company operates in an FDA and cGMP-certified premises.

Does It Work?

Yes, it works and the answer to that is pretty straight forward. Caffeine on its own is known for boosting focus and energy and L-Theanine, on the other hand, does an incredible job of smoothing out the edges of the Alpha brain wave.

So, it’s a no-brainer. This product should work unless you have developed a serious tolerance to any of those two ingredients.

The only concern we have is that the caffeine part of it may cause a crash but with L-Theanine forming part of the ingredients, the chances of any adverse effects have been greatly reduced.

Its Ingredients

products product caffeine facts

What are the actual ingredients that make up this nootropic stack? The list is short and sweet and brings together the dynamic duo of Anhydrous Coffee (100mg) and L-Theanine (200mg).

1. Anhydrous Caffeine (100 mg)

This is a reliable nervous system stimulant. It helps clear drowsiness and also gives you that much-needed boost of energy. In particular, anhydrous caffeine is found in a highly concentrated powder form which optimizes its effects. Therefore, only a small portion of it is required to achieve some mind-boosting effects.

The fact that only 100mg of this is included in the formula makes the entire stack largely safe and reduces the risk of a crash to next to none.

But even with that said, it is important to acknowledge that caffeine has its potential downsides. For instance, the longer you take it, the more of it is required to achieve the same desired effect.

2. L-Theanine (200 mg)

This is an amino acid that’s naturally found in green tea leaves. As a nootropic, it has become quite popular especially owing to the fact that it promotes relaxation. When you’re properly relaxed, you’re much more likely to deal with stress, overcome depression and focus better.

Needless to say, by stacking L-Theanine and Caffeine, you’re likely to experience optimal brain activity and memory effects. There is also the argument that L-Theanine tends to lower blood pressure and this, in our view, can significantly reduce the probability of experiencing jitters after taking caffeine.

Besides that, this particular nootropic does an incredible job of boosting the production of dopamine and serotonin. And as you might be aware, those nootropics are entirely responsible for your mood, quality of sleep and emotional balance.

3. Other Ingredients

The other 4 ingredients are inactive ones among them the vegetable capsules, vegetable stearate, silica, and cellulose. There’s no need to talk much about those because they are a common feature in the supplements world and aren’t involved in any reactions in the body save for delivering the active ingredients.

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Who Takes This Product

Because of its relatively affordable price, this is a stack that anyone can freely partake of. So it’s really a question of whether or not you want to have caffeine as part of the ingredients in your favorite stack. Otherwise, this product has a high rate of success and we’re yet to come across people who don’t use it as it provides an all0in-one cognitive function booster.

Potential Side Effects

This product is likely safe for most adults as long as it’s used appropriately. It’s, however, possibly unsafe, if overdosed on for a long time. It can cause stomach irritation, nervousness, nausea, vomiting, and restlessness.

The WebMD warns that if taken orally, caffeine has the ability to cause irregular heartbeats.

So, the take-home here is that although this product is highly safe, it should be taken in moderation.

Recommended Dosage

With each serving of Smart Caffeine equaling 5 cups of coffee, it’s important to abide by the recommended dosage at all times. Consider starting out by taking just 1 capsule at a time and then you can increase that to 2 capsules over time.

And because this is a caffeine-rich supplement, it’s important to avoid taking it a few hours before going to bed as it might worsen your insomnia symptoms. In regards to the maximum dosage, the manufacturer suggests that you should never exceed 6 capsules of this in under 24 hours.

Pros & Cons


  • Its 2:1 ration of L-theanine to caffeine makes it largely safe
  • The product is packaged in cGMP accredited facilities
  • Great customer service and shipping track-record
  • The pills are quite affordable (It’s only 33 cents per pill)
  • Packaged in vegan-friendly capsules


  • Caffeine has quite a number of potential side effects (as discussed above)
  • One may build up a tolerance to this product if they take it daily

Final Thoughts

Smart Caffeine may not have the sophistication of your average nootropic stack but it certainly has its numerous benefits. And so, if you’re a fan of caffeine and would like to take a cleaner and more efficient formula, you should consider giving this product a shot.

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