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Prebiotics are often overlooked in favour of flashier probiotic blends, but feeding the bacteria already present in the gut is just as important as adding new strains. Innerfuel earns its place here because of its clean, two-ingredient formulation — acacia gum and larch arabinogalactan are among the better-studied soluble fibres, and the absence of fillers makes dosing straightforward. It is a quiet, reliable daily foundation for gut health rather than a short-term intervention.
About this product
Innerfuel Prebiotic Blend
Innerfuel Prebiotic Blend is a two-ingredient prebiotic fibre supplement from Bulletproof, combining acacia gum and larch arabinogalactan to support the growth of beneficial bacteria in the gut. Both are soluble, non-digestible fibres — they pass through the upper digestive tract intact and are fermented by bacteria in the colon, where they may help increase populations of Bifidobacterium and Lactobacillus species. This is not a probiotic; it feeds the microbiome you already have rather than adding new strains.
The blend suits anyone who wants to support digestive regularity, those who feel their fibre intake is consistently low, or individuals who have recently completed a course of antibiotics and want to encourage a healthier microbial environment. It may also interest people managing bloating or irregular bowel habits who prefer a flavour-neutral powder over capsules.
Both acacia gum and larch arabinogalactan have a good tolerability record. Larch arabinogalactan is also studied for its potential role in immune modulation at the gut lining, though clinical evidence remains in development. The formula is deliberately minimal — just two well-characterised fibre sources, no fillers or flavourings, which makes it straightforward to add to coffee, a smoothie, or water without altering taste significantly. For a doctor-curated shop, that simplicity is a point in its favour: you know exactly what you are taking.
What it does
Benefits
- 01
Feeds beneficial gut bacteria via fermentable prebiotic fibre
- 02
May support digestive regularity and bowel consistency
- 03
Studied for potential immune support at the gut lining
- 04
Flavour-neutral powder suitable for daily use in drinks
- 05
Minimal ingredient list — no fillers or artificial additives
Get the most from it
How to use
Mix one scoop into water, coffee, or a smoothie daily. Starting with a smaller amount and building up gradually is sensible if you are not used to supplemental fibre, as rapid increases can cause temporary bloating. Follow the dosage guidance on the packaging.
What's inside
Ingredients
View full ingredient list
Acacia Gum, Larch Arabinogalactan
Common questions
Frequently asked
What is the difference between a prebiotic and a probiotic?
Probiotics are live bacteria you introduce into the gut. Prebiotics are fibres that feed the bacteria already living there. Innerfuel contains no live cultures — it works by providing fermentable fuel for your existing microbiome.
Will this cause bloating?
Soluble fibres can cause temporary gas or bloating when introduced quickly, particularly if your current fibre intake is low. Starting with a smaller amount and increasing gradually over one to two weeks tends to reduce this effect.
Can I take this alongside a probiotic supplement?
Yes — prebiotics and probiotics are commonly used together. The prebiotic fibre may help sustain the bacterial strains introduced by a probiotic, which is why combined use is often recommended. Check with your GP or clinician if you have an inflammatory bowel condition before starting either.
Who should be cautious about taking this product?
Those with irritable bowel syndrome (IBS), particularly the diarrhoea-predominant subtype, should introduce fermentable fibres carefully, as they can aggravate symptoms in some individuals. If you have a diagnosed gut condition, speak to a clinician before adding a prebiotic supplement.
How long before I notice a difference?
Meaningful changes to the gut microbiome typically take several weeks of consistent daily use. Improvements in digestive regularity may be noticed sooner, but prebiotic supplementation is best treated as a long-term habit rather than a quick fix.
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