The World’s First Open-Source Supplement Company

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

NEUROFUEL™ - FOR A BETTER BRAIN

NEUROFUEL™ is the original CILTEP® formula for enhanced focus, deep concentration and improved memory. 

The premium natural ingredients work as fuel for your neurotransmitters, supporting greater signaling between brain cells. 

FEEL THE FUEL within 30 minutes of your first dose. 

Smart Caffeine

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.

Creates a relaxed yet alert state that is ideal for focusing and thinking clearly.

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.

average rating 4.8 out of 5
Based on 88 ratings
  • 5 Stars
    75 Reviews
  • 4 Stars
    11 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
    0 Reviews
  • 1 Star
    1 Review
99% of reviewers would recommend this product to a friend
79 Reviews
Rated 5 out of 5
Review posted

Insane combination

The combination of Smart Caffiene and CILTEP is insaaaane. Smart Caffiene works better and smoother than a cup of coffee and last longer (can sometimes take an hour to kick in though) and CILTEP is the real deal when it comes to "making me feel smarter". I've really noticed CILTEP's effectiveness when I take it then play guitar shortly after. The connection and speed between notes is much faster and my memory of songs etc is way better. I can see this being very helpful for someone who is freestyle rapping or giving a speech/lecture as its helps you think of things/ideas before you say them. Go get it ;)

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Enhanced Concentration
Rated 5 out of 5
Increased Motivation
Rated 5 out of 5
Mood Elevation
Rated 5 out of 5
Increased Energy
Rated 5 out of 5
Improved Concentration
Rated 5 out of 5
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Natural Stacks

Insaaaaaane is right, Ian! Glad CILTEP is helping you become a better guitarist! CILTEP is great when it comes to learning new things.

Rated 4 out of 5
Review posted

CILTEP has a noticeable effect

I don't use the Smart Caffeine (I got the bundle as part of a special deal), but I can say the CILTEP definitely works. I notice I'm more in control of my concentration and able to filter out distractions, and put my thoughts into words better. It lasts all day but doesn't interfere with sleep at all, in fact sleep has been better lately. There's no up-and-down crash like with caffeine. Overall it's pretty subtle but noticeable.

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Enhanced Concentration
Rated 5 out of 5
Increased Motivation
Rated 3 out of 5
Mood Elevation
Rated 3 out of 5
Increased Energy
Rated 3 out of 5
Improved Concentration
Rated 5 out of 5
Was this helpful?

Natural Stacks

Thanks, Jeremy! We're glad to hear that CILTEP has not only helped in enhancing your level of concentration but in getting a restful sleep as well!

Rated 5 out of 5
Review posted

Focus and clarity

Works very well with the dopamine.

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Enhanced Concentration
Rated 5 out of 5
Increased Motivation
Rated 4 out of 5
Mood Elevation
Rated 4 out of 5
Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 5 out of 5
Was this helpful?
Rated 5 out of 5
Review posted

Love the energy boost!

I love how CILTEP gives you a little boost of energy in the morning and since beginning on the Smart Caffeine I have not drank any energy drinks.

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Enhanced Concentration
Rated 5 out of 5
Increased Motivation
Rated 5 out of 5
Mood Elevation
Rated 5 out of 5
Increased Energy
Rated 5 out of 5
Improved Concentration
Rated 5 out of 5
Was this helpful?
Rated 4 out of 5
Review posted

CILTEP + Smart Caffeine

I got the Ciltep and Smart Caffeine stack from Natural Stacks, after I had been taking the Smart Caffeine stack for about a month before I purchased the Ciltep. The stack was a little strong for me. I got a rush at the beginning and had a weird feeling stacking both products at the same time so I stopped taking the Ciltep, and Natural Stacks made it right for me. Of course I'm still taking the Smart Caffeine on a frequent basis and I like it a lot. I would say give the stack a try to see if it works for you, because at the end of the day everything works different for everybody.

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Enhanced Concentration
Rated 3 out of 5
Increased Motivation
Rated 4 out of 5
Mood Elevation
Rated 3 out of 5
Increased Energy
Rated 3 out of 5
Improved Concentration
Rated 3 out of 5
Was this helpful?
1
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