Natural Stacks Smart Caffeine Review – Is This Energy Booster Effective?

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By Jack Cincotta, MS

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

Natural Stacks Smart Caffeine Review

Caffeine is truly the most widely used psychoactive substance in the whole world. Whether people get it from coffee, energy drinks, or something else, the fact is that most people are hopped up on caffeine on a daily basis.

And while many people enjoy it, there’s also a large percentage of people who don’t like some of the side effects. You know, jitters, anxiety, and rapid heart rate. Or the annoying restlessness and insomnia that can occur if you take caffeine too late in the day.

But there are now supplements available that claim to offer a cleaner boost in energy, without all of caffeine’s side effects, by including synergistic ingredients.

And one such supplement is called Natural Stacks Smart Caffeine. Can this supplement really give you the energy boost you need? Let’s dive into this Natural Stacks Smart Caffeine review so you can find out if it’s worth the purchase!

Natural Stacks Smart Caffeine

About Natural Stacks Smart Caffeine

Smart Caffeine is made by Natural Stacks, a health and wellness company with a focus on brain/mental health and cognitive function. They have produced a wide variety of other supplements, many of which we have reviewed as well.

Other Natural Stacks Supplements:

Natural Stacks Supplements

And Natural Stacks Smart Caffeine is a basic but potentially highly effective combination of caffeine with l-theanine (theanine). 

Adding in theanine is supposed to counter some of the undesirable side effects of caffeine, while still providing its benefits. In turn, Smart Caffeine is designed to be the perfect product for long-lasting energy and attention without all of the jitters, anxiety, or eventual crash.

Natural Stacks Smart Caffeine Benefits

Natural Stacks Smart Caffeine is advertised to be the perfect cognitive-enhancing combo, with the following benefits:

  • Enhanced Focus and Alertness
  • Improved Cognitive Function
  • Enhanced Short-Term Memory
  • No Overstimulation 
Natural Stacks Smart Caffeine Bottle

Enhanced Focus and Alertness

Natural Stacks Smart Caffeine is advertised to deliver a calm, focused alertness. This may help you channel the energy and alertness you get to be more productive. 

Improved Cognitive Function

The combo of caffeine and theanine in this product is also advertised to improve aspects of cognitive function. This includes better attention, focus, accuracy, and mental processing. 

Enhanced Short-Term Memory

Another advertised benefit of Natural Stacks Smart Caffeine is enhanced short-term memory. This may be in part due to better attention and focus, but it may also offer direct memory-stimulating effects.

No Overstimulation

You can’t do much with greater alertness and energy if you’re all wired up and can’t settle down. But Smart Caffeine is advertised to give you all of that without being overstimulated. This means no jitters, anxiety, pounding heart, or other things that may distract you from top performance.

So, is Natural Stacks Smart Caffeine a go-to product for mental performance and brain power? Read on to find out!

Natural Stacks Smart Caffeine Ingredients

Natural Stacks keeps it plain and simple with their ingredients. They say it has caffeine and theanine, and that is truly it. 

We’ll go over both of these by themselves briefly. And then talk about what might make the combination beneficial. 

Natural Stacks Smart Caffeine Pill Capsules


Good ol’ caffeine. 

Everybody knows about it. Most people take it. 

It blocks adenosine receptors and increase dopamine, serotonin, acetylcholine, and norepeinepherine since it’s a stimulant. And this results in the common feelings of increased energy, alertness, and even mood that people feel. 

Recommended Dose: 100 to 200mg


Not as well-known but certainly still popular (especially in recent years) is theanine. Theanine is an amino acid found in green tea and known for its relaxing properties.

 It can increase GABA levels and alpha waves in the brain, which provides a calm, relaxed, focused state. It’s often said that the monks consume green tea to help them dive deeper into meditations…

And you can find it in many other mind-boosting products, such as Gorilla Mind Smooth.

Recommended Dose: 200 to 400mg

Caffeine Plus Theanine: Synergistic Effects?

By themselves, both caffeine and theanine have benefits. 

But when taken together, they may have even greater benefits. 

Specifically, theanine is known for being able to reduce some of the negative effects of caffeine, such as distractions and jitters.

And research has shown that the caffeine-theanine combination is effective for enhancing attention, alertness, focus, reaction time, and overall cognition. Plus, it seems to reduce mind wandering and distractions, while also decreasing fatigue. 

Also, the effects seem best when theanine is dosed higher than caffeine, typically upwards of a 2:1 ratio. 

Recommended Dose: 2:1 ratio using dosages mentioned above for each ingredient.

Does Natural Stacks Smart Caffeine Work?

It is very likely that Natural Stacks Smart Caffeine will work closely to as advertised.

They get right to the point and only include caffeine and theanine. These ingredients are very well-researched. 

And their combination is proven to enhance focus, attention, cognition, and alertness.

Plus, they use a solid dosage of each and in the correct ratio of 2:1 for theanine and caffeine.

The only downfall is that it might’ve been beneficial to include even more cognitive-boosting ingredients alongside caffeine and l-theanine, such as tyrosine and choline. That’s what they do in other supplements, such as Dioxyme Brain.

Claims vs. Reality

Overall, you should likely see enhanced focus, alertness, cognitive function, and working memory, just like they advertise. And you should also see less anxiety, jitters, and general “overstimulation.” 

Of course, it’s good to be realistic about how much you will improve.

Basically, I’d expect mild to moderate effects when you take Smart Caffeine. For some, you might not even directly notice it, even though it still could be working. 

Typically, products like this just give a nice general sense of focus and even well-being, but nothing crazy. 

But that could be all the difference you need. 

Who is Natural Stacks Smart Caffeine Best For?

Natural Stacks Smart Caffeine is primarily best for people who want to experience enhanced cognitive function, alertness, and focus while reducing anxiety, jitters, and other caffeine side effects.

Natural Stacks Smart Caffeine Bottle In Hand

Basically, if you’re looking for a better and more effective alternative to only caffeine, Smart Caffeine is worth looking into.

Is Natural Stacks Smart Caffeine Safe?

Natural Stacks Smart Caffeine certainly has a decreased risk of side effects due to the modest dose of caffeine and since theanine helps to eliminate some of caffeine’s side effects. 

But anxiety, jitters, and insomnia are all still possible, especially for people who are very sensitive to stimulants.

Also, you may experience headaches, dizziness, or some digestive symptoms, including upset stomach. 

Also, Natural Stacks Smart Caffeine is 3rd-party tested and partnered with Healthloq for potency, purity, and safety. 

Where to Buy Natural Stacks Smart Caffeine

You can buy Natural Stacks Smart Caffeine on the official Natural Stacks website at this link.

natural stacks smart caffeine where to buy

Each bottle has 60 servings (60 capsules). 

The regular price for a one-time purchase is $19.95 ($0.33/serving). But you can choose the Subscribe & Save option to save 20%, lowering the price to $15.96 ($0.27/serving).

With the subscription, you can get it delivered every 1, 2, or 3 months, or every 5, 6, or 7 weeks. 

I’m pretty impressed with how low of a price they offer. Either option is highly affordable and well worth the dosage of caffeine and theanine you’re getting.

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They also have a 30-Day Money Back Guarantee. If you’re not satisfied with Smart Caffeine, just let them know within 30 days of product purchase and you’ll get a refund; no return required. But returns are required after the first bottle.

Final Verdict: Natural Stacks Smart Caffeine Review

Well, that’s about it for this Smart Caffeine review. Natural Stacks Smart Caffeine is a very basic but effective product. It has solid doses of theanine and caffeine, all in the right ratio. 

Overall, we recommend it to anyone looking for a quick and convenient way to get a boost in cognition and mental performance.

Overall Rating:
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Jack Cincotta, MS

Jack Cincotta is a certified holistic health coach through AFPA and a board-certified holistic health practitioner through AADP. He has written hundreds of articles on nutrition and supplementation. Jack has a M.S. degree in Psychology and is passionate about researching the science behind nutrition. He often uses research-backed supplementation protocols for many of his clients to optimize results.