Smart Caffeine is an energy booster developed by Natural Stacks. It provides the purest form of caffeine and l-theanine to improve focus and energy level. But can it substitute your morning coffee? Check out my Smart Caffeine review.

Smart Caffeine Review

Smart Caffeine is a fairly simple but effective supplement that consists of only two ingredients – natural caffeine and l-theanine.

Smart caffeine review

Its formula is pretty much the same as of other similar products with one important difference – the company which developed the product (Natural Stacks) is using only the purest ingredients possible, and it is known for its high-quality products.

Even though energy pills are generally effective, the question remains: Can supplementing Smart Caffeine capsules substitute a cup of coffee?

Well, I will be frank with you – I love drinking coffee. I love the smell of it, I love the taste, and I love the whole procedure of making it.

Even though coffee gives me tons of energy (especially the Bulletproof Coffee), I hate the crash that follows after drinking it.

Whenever I have a chance, I try to drink coffee in the morning and then combine it with green tea a couple of hours later.

But if you don’t like this combo, or if your search for a more straightforward solution that brings similar effects, Smart Caffeine is a product to check.

Smart Caffeine Ingredients

Smart Caffeine contains only two ingredients:

  • 100 mg of natural caffeine
  • 200 mg l-theanine from green tea

Smart Caffeine Ingredients


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

It is one of my favorite nootropics that has the role of a relaxing agent without sedation. The relaxing and attention-promoting properties of l-theanine have their most significant supplemental role in attenuating the edge of many stimulants. [*]

A combination of L-Theanine with caffeine is noted to promote cognition and attention. [*]

200 mg is an optimal daily dosage.

Natural Caffeine

Caffeine is the world’s most popular natural cognitive enhancer. It is a powerful stimulant that is used to improve physical strength and endurance. [*]

But why is it classified as a nootropic?

Mainly because it sensitizes neurons, and also because it provides mental stimulation. Caffeine’s primary mechanism concerns antagonizing adenosine receptors.

It causes alertness and wakefulness. The inhibition of adenosine can influence the dopamine, serotonin, acetylcholine, and also adrenaline systems. [*]

100 mg of caffeine combined with 200 mg of l-theanine is an optimal combination for energy.

Smart Caffeine Dosage

The suggested dosage of Smart Caffeine is 1-2 capsules whenever you need more focus and energy. According to Natural Stacks, it is not recommended to take the pills in the evening or before sleep.

I suggest taking 2 capsules early in the morning (after breakfast). Also, you shouldn’t take more than 6 capsules per day.

I definitely don’t advise you to take the supplement after 2 PM to avoid any sleep-related issues.

For the ultimate performance, I recommend combining Smart Caffeine with a high-quality nootropic supplement.

Click here to check our favorite ones.

smart caffeine natural stacks

Smart Caffeine Side Effects

During my test of Smart Caffeine, I experienced no adverse side effects. However,  supplementing caffeine can come with unwanted side effects such as [*]

  • Restlessness
  • Jittery
  • Insomnia
  • Anxiety
  • Dehydration
  • Energy crash

To avoid the side effects, stick to the recommended daily dosage. In case you experience any adverse effects, stop taking the capsules immediately, and consult your doctor.

Pros & Cons

After my thorough analysis of this nootropic supplement, I wrote down its biggest pros & cons.


  1. It boosts focus & energy
  2. No jitters or an energy crash after taking the capsules
  3. It is relatively affordable


  1. Coffee tastes better
  2. Coffee contains other antioxidants
  3. Not as effective as a cup of strong coffee
  4. I believe there are better energy boosters available on the market

But what do others think about this product?

Smart Caffeine Reviews

Alongside all other products of Natural Stacks, Smart Caffeine has a pretty good reputation on the market. You don’t believe me? Just check the feedback from other users: 

“Love this product. I'm usually a 2 - 3 cup of coffee a day. With Smart Caffeine I maintain focus and mental energy with no jitters or crash.”

“Simple yet effective product for a great price. I’m not a big coffee drinker so I thought it still might give me the jitters (even with the l-theanine), but it hasn’t at all. I feel a nice sustained energy from it without the anxious and jitters feeling you can get from drinking coffee or anything with a lot of caffeine. Will buy again.”

“I can unequivocally recommend this product. I have been experimenting with Nootropics for about 2 years with varying results. Personally, I find it hard to quantify how effective some of them are. Sometimes the effects are obvious, other times not so much but when you look back on the time you were taking them and what you got done the advantages becomes a lot clearer. This is one of those rare nootropics products which it's clear to see the effects immediately. Essentially it does what it says on the tin, energy and focus without the shakes.”

Where To Buy Smart Caffeine?

I recommend Smart Caffeine to everyone who is searching for:

  • Increased focus and alertness
  • Improved cognitive function
  • Enhanced short-term memory retention
  • More ability to ignore distractions
  • No overstimulation

You can buy Smart Caffeine here. At the price of 19,95 USD, it’s a very affordable supplement.

However, if you want to dramatically enhance your cognitive performance, then check my final recommendation below.


Your Inception potentially recommends supplementing Smart Caffeine by Natural Stacks. Smart Caffeine is a great combo of L-Theanine and caffeine. It provides a nice energy boost without the typical caffeine crash. It’s a great option for a quick energy boost, but that’s everything you can expect from this supplement.

To achieve better cognitive performance, we suggest taking an effective and high-quality nootropic stack. Click on the button below for more information.

Frequently asked questions

1. Are there any side effects of caffeine?
During my test period, we experienced no side effects. Just follow the guidelines, and don’t take the supplement after 2 PM.

2. When is the best time to taking Smart Caffeine by Natural Stacks?
You should take it just before you need an additional energy push. You can take it in the morning, before going to work or to college.

3. Ciltep and Smart Caffeine – should you combine them?
To achieve ultimate cognition , I suggest combining Smart Caffeine with one of the best nootropic stacks on the market.