Bulletproof InnerFuel Prebiotic Review – Is This Supplement Effective?

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By Jack Cincotta, MS

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

Bulletproof InnerFuel Prebiotic Review

In the early going, probiotics took center stage for gut health optimization. 

But over the past few years, a number of other “biotics” have received a lot of attention, including prebiotics. 

Prebiotic supplements are often used alone or in combination with probiotics to potentially increase digestion and overall gut health. 

However, the ingredient quality, dosage, and type can differ widely between prebiotic supplements, so it’s essential to know if what you’re getting actually works. 

And in this article, I’ll go over a prebiotic formula called Bulletproof InnerFuel Prebiotic to see how it stands against the competition. 

Continue reading this Bulletproof InnerFuel Prebiotic review to learn more about its ingredients, possible benefits, mechanisms, and if it’s ultimately worth buying. 

Bulletproof InnerFuel Prebiotic

About Bulletproof InnerFuel Prebiotic

Bulletproof InnerFuel Prebiotic is a gut health and immune support supplement made by Bulletproof. 

Some of you may have heard about Bulletproof and the Bulletproof brand. It was founded by biohacker and fitness fanatic, Dave Asprey, and has produced a variety of supplement options since, many of which we have reviewed.

Our other Bulletproof supplement reviews include:

Bulletproof Supplements

Bulletproof InnerFuel Prebiotic is crafted with numerous plant-sourced prebiotic ingredients to feed the good bacteria in your gut to keep your microbiome thriving. 

Also, InnerFuel Prebiotic contains a 3-in-1 combo of clinically-researched ingredients to support not only gut health, but immune function too, which are acacia, SunFiber, and ResistAid. 

On top of that, Bulletproof InnerFuel Prebiotic is flavorless and dissolves quickly, so you can use it with any beverage you want. 

Bulletproof InnerFuel Prebiotic Benefits

The main advertised benefits of Bulletproof InnerFuel Prebiotic are:

  • Digestion Support
  • Enhanced Gut Health
  • Improved Immune Function
Bulletproof InnerFuel Prebiotic Powder

Digestion Support

Many people today struggle with digestive issues, such as bloating and nausea. And these can often be traced back to a poor gut microbiome, which often stems from a low-fiber, unhealthy diet.

But Bulletproof InnerFuel Prebiotic is advertised to improve digestion by enhancing gut microbiome health, especially if you struggle with eating enough fiber-rich foods on a daily basis. All in all, the prebiotics included are designed to keep you regular and limit any bothersome digestive symptoms.

Enhanced Gut Health

A lot of health issues can stem from poor gut health, so it is really important to keep your gut as healthy as possible. 

And the plant-based prebiotics in InnerFuel Prebiotic are designed to increase the function of your gut microbiota, which may increase overall gut health. You may even get a boost in gut barrier protection, which could help minimize symptoms of leaky gut syndrome. 

Improved Immune Function

If your gut isn’t healthy, chances are, your immune function isn’t optimal either. This is because the gut and immune system are tightly interconnected. 

Fortunately, Bulletproof InnerFuel Prebiotic claims to be able to improve immunity not only by enhancing gut health; but some of the ingredients are designed specifically to fight off inflammation and free radicals. 

What we have so far sure looks like a powerful prebiotic supplement. 

But continue reading this Bulletproof InnerFuel Prebiotic review to see if it’s actually effective! 

Bulletproof InnerFuel Prebiotic Ingredients

Bulletproof InnerFuel Prebiotic has three, plant-based prebiotic ingredients.

Bulletproof InnerFuel Prebiotic ingredients include:

  • Organic Acacia
  • Sunfiber Partially Hydrolyzed Guar Gum
  • ResistAid Larch Arabinogalactan
bulletproof innerfuel prebiotic supplement facts


BulletProof InnerFuel Prebiotic contains organic acacia. It comes from the sap of the acacia tree, and it is also known as gum arabic, acacia cum, and other names. 

The polysaccharides in acacia gum may act as prebiotics. And they have been shown to increase beneficial bacteria in the gut while decreasing pathogenic bacteria. 

Overall, it seems to enhance gut health and may even increase satiety. 

You can find it in many other prebiotic supplements too, such as PrebioThrive

Recommended Dose: 10 to 15g


Sunfiber is a trademarked form of partially hydrolyzed guar gum (guar gum). Guar gum is a water-soluble fiber that seems to enhance digestion and gut health.

Research on guar gum, including the Sunfiber form, shows that it increases a number of beneficial bacteria in the gut while inhibiting pathogenic bacteria and improving GI symptoms. 

Recommended Dosage: 5 to 11g


ResistAid is a trademarked form of Larch arabinogalactan, which is a starch-like substance found in the bark and wood of the Larch tree. 

In a few studies, ResistAid larch arabinogalactan has been shown to enhance various aspects of immune function, such as natural killer cells, antibodies, and cytokine function. And it seems to help reduce cold symptoms and boost overall immune health. 

Plus, it was recently found that ResistAid can increase probiotic counts in the gut and decrease bad bacteria. 

Recommended Dosage: 1.5 to 4.5g

Does Bulletproof InnerFuel Prebiotic Work?

It seems very likely that Bulletproof InnnerFuel Prebiotic will work for gut health and immune function. 

All three of the ingredients are really well-researched, and both of the trademarked ingredients have specific evidence behind them. 

Bulletproof InnerFuel Prebiotic Bottle

Plus, all three ingredients are dosed properly (although ResistAid® is on the lower, but still effective, end). Overall, this means that you can probably expect to see the same benefits that occurred in the studies, such as improved gut microbiota health, enhanced digestion, and boosted immunity. 

Claims vs. Reality

It’s a rare case when a product can stand by all of its claims. But in the case of InnerFuel Prebiotic, this is likely the situation. 

I would expect InnerFuel Prebiotic to support digestion and improve gut health given that all three ingredients have been shown to increase good bacteria, decrease bad bacteria, and improve other aspects of gut health. 

Plus, it is likely that you will see an increase in immune function thanks to ResistAid®. But this might not be a huge improvement. 

Altogether, I’d expect Bulletproof Innerfuel Prebiotic to be a nice gut and immune support supplement with mild to moderate benefits. 

Who is Bulletproof InnerFuel Prebiotic Best For?

Bulletproof InnerFuel Prebiotic is best for anyone who wants a specific prebiotic supplement to enhance digestion, gut health, and immune function. It may be a suitable option for anyone with occasional GI symptoms such as bloating, nausea, upset stomach, or irregularity.

Bulletproof InnerFuel Prebiotic Scoop

It’s wise to talk to your doctor before taking any supplement, especially in cases of more severe symptoms. 

Is Bulletproof InnerFuel Prebiotic Safe?

Perhaps surprisingly to some people, some of the side effects of prebiotics are the very symptoms they’re trying to correct. 

For some people, Bulletproof InnerFuel Prebiotic may increase GI symptoms, at least initially, such as bloating, upset stomach, and gas. 

These typically subside as your gut microbiota adjusts. But some people may not be able to handle prebiotics at all. 

Bulletproof InnerFuel Prebiotic is made in an FDA-approved, GMP-certified facility. 

It is also keto-friendly, soy-free, dye-free, gluten-free, non-GMO, and contains zero sugar. 

Where to Buy Bulletproof InnerFuel Prebiotic

You can buy InnerFuel Prebiotic on the Bulletproof website at this product link

bulletproof innerfuel prebiotic where to buy

Each container of InnerFuel Prebiotic has 20 servings (40 scoops). 

The regular price is $39.95 ($2/serving), but you can save 20% by choosing the Subscribe & Save option, which lowers the price to $31.96 ($1.60/serving). You can choose to get it delivered every 2, 4, 6, 8, 10, or 12 weeks. 

This is a pretty expensive product, but based on the quality and dosage, this price seems justified. After all, it’s better to pay a little more and actually get an effective product rather than paying under a dollar per serving but getting no results. 

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Shipping and Returns

You also get free shipping on orders in the U.S. over $35. They also ship to Canada and other parts of the world, although they don’t ship to some countries (so check the website). Most orders will be delivered within two to 12 days. 

They also offer a 30 Day Return Policy. You must have an authorized return and return it within 30 days of receipt. 

Final Verdict: Bulletproof InnerFuel Prebiotic Review

You’ve reached the end of this Bulletproof InnerFuel Prebiotic review. 

I must say, I’m impressed with this prebiotic supplement and believe it is definitely one of the better ones out there. 

And this is great since many people struggle with gut health these days. 

Maybe you’re one of those people who, all too often, struggles with bloating, indigestion, irregularity, poor immune health, and other bothersome symptoms. 

But if so, Bulletproof InnerFuel Prebiotic is definitely worth at least considering. I recommend it as one of the better prebiotic supplements out there based on its ingredient quality, dosage, and overall benefits.

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.