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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 91 ratings
  • 5 Stars
    78 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
Enhanced Concentration
Rated 4 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 4 out of 5
Customer photos and videos
82 Reviews
Reviewed by Jonathan C., from United States
Verified Buyer
I recommend this product
My Age
18 - 24
My Regular Dosage
3 Capsules
I Use CILTEP For
  • Everyday
My Results
  • Elevated Mood
  • Improved Concentration
  • Improved Memory
  • Increased Motivation
Results
  • Increased Energy
  • No Crash
Rated 5 out of 5
Review posted

Great combo

The one two punch that hotwires the brain

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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?
Reviewed by Tyler M., from United States
Verified Reviewer
I recommend this product
My Age
18 - 24
I Use CILTEP For
  • Everyday
  • Sports
  • Work
  • Training
  • Study
Rated 5 out of 5
Review posted

Best Nootropic

Best nootropic I've come across on the market

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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?
Reviewed by Jeff H., from United States
Verified Buyer
I recommend this product
My Age
45 - 54
My Regular Dosage
1 Capsule
I Use CILTEP For
  • Sports
  • Gym
  • Training
My Results
  • Improved Concentration
  • Improved Memory
Results
  • Increased Energy
  • No Crash
  • No Jitters
Rated 5 out of 5
Review posted

Neurofuel and Smart Caffeine

I love both of these products. I use the Smart Caffeine nearly daily. Such a better way to go than Preworkouts or other stimulants. Well done!

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Enhanced Concentration
Rated 4 out of 5
Increased Motivation
Rated 3 out of 5
Mood Elevation
Rated 2 out of 5
Increased Energy
Rated 4 out of 5
Improved Concentration
Rated 4 out of 5
Was this helpful?
Reviewed by Ian V., from United States
Verified Buyer
I recommend this product
My Age
25 - 34
My Regular Dosage
3 Capsules
I Use CILTEP For
  • Work
  • Everyday
My Results
  • Improved Concentration
  • Improved Memory
  • Elevated Mood
  • Increased Motivation
Results
  • Increased Energy
  • No Crash
  • No Jitters
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
Was this helpful?

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.