This is a working document of how we're building Gutline. Not a polished story, the actual reasoning. What we've decided, what we've deliberately excluded, what the research says, and what we're still working through. It will change as the product evolves.
We'd rather show our work than wait until everything's perfect.
Coeliac disease affects approximately 1 in 70 Australians (around 367,000 people), and an estimated 80% remain undiagnosed.[1] Add in non-coeliac gluten sensitivity, wheat allergy, and people who choose gluten-free living for other reasons, and the population that lives gluten-free is significantly larger.
The supplement market has largely ignored them.
Generic multivitamins are formulated for a hypothetical "healthy adult" with a healthy gut absorbing nutrients normally. They aren't designed for someone whose body may absorb differently after years of gluten-related impact. They aren't dosed around the deficiencies that show up consistently in gluten-free populations. And almost none address the broader nutritional gaps, gut nutrition, and prebiotic fibre intake, that the published research consistently flags as different for people living without gluten long-term.
Gutline exists because the clinical picture is well-documented in the research, but the products built around it aren't.
A 2025 systematic review and meta-analysis of 46 observational studies found that coeliac patients on a gluten-free diet had decreased risk of vitamin D, B12, calcium, and other key nutrient deficiencies, but only over time, with persistent gaps remaining for many.[2] A 2019 Mayo Clinic study (n=309) found that micronutrient deficiencies were common even in contemporary newly-diagnosed patients without overt malabsorption symptoms.[3] The deficiency isn't theoretical. It's the baseline.
Our first formulation brief targeted documented micronutrient deficiencies, eight nutrients consistently low in gluten-free populations. Clinical review surfaced an important critique: deficiency correction alone isn't enough if the underlying gut isn't supported. We're now building across three layers.
The eight micronutrients consistently documented to run low across gluten-free populations, iron, B12, folate, D3, magnesium, zinc, selenium, K2, at clinical doses in bioavailable forms. Not a generic multivitamin: the dose ranges and forms are specifically chosen for a population with compromised absorption and reduced dietary fortification.
L-glutamine, an amino acid that published research identifies as the primary fuel source for the cells lining the intestine. The rationale for inclusion: nutritional support for the cells that do the absorbing matters as much as the nutrients being absorbed. Included as a foundational addition for people whose gluten-free routine may be missing what wheat-based diets typically provide.
PHGG (partially hydrolysed guar gum), a prebiotic fibre. Gluten-free diets are systematically lower in fibre than wheat-based diets, which is one of the most consistent findings in the published nutritional literature. PHGG is one of the better-studied prebiotic fibres and is well-tolerated at the dose we've chosen.
The expanded format means a slightly larger sachet, around 9g rather than the original 5g. That's a deliberate trade-off: a comprehensive product that addresses the actual clinical picture, rather than a focused product that ignores most of it.
The current working formulation. Doses and forms are subject to clinical review and may change before launch. Where they do, we'll update this document and explain why.
Most supplement brands tell you what they include. The harder discipline, and arguably the more honest one, is being clear about what's left out, and why.
Gutline will be manufactured in Australia. We're prioritising manufacturers with strong gluten-free credentials, the right format capability for our 9g sachet, and audit history that supports our gluten testing commitments. Conversations active with multiple Australian candidates.
We're not picking on price alone. The questions we ask each potential manufacturer:
The badge on our sachet, "Batch Tested for Gluten", is a commitment to test every commercial production batch independently for gluten content before release, by a third-party laboratory. Our launch commitment is below 20 parts per million, the internationally accepted "gluten-free" threshold used across most global markets. Australia's own FSANZ standard requires no detectable gluten, which is stricter still and represents the direction we're working toward. As our manufacturing partnership matures, our commitment is to keep tightening our threshold over time. We won't claim a stricter number until we can verify it batch-by-batch.
Gutline isn't being formulated by one person in a vacuum. Beyond the founder, the people materially shaping the product include:
An experienced clinical practitioner specialising in gut health and the long-term impacts of gluten-free living is engaged to review and refine the formulation. Their input is what shifted us from a focused micronutrient brief to the three-layer approach you see today. We'll name them publicly once their engagement is formally structured and they consent to be named.
An Australian regulatory consultancy is being engaged at the appropriate stage to review claim language, labelling, and ingredient permissibility ahead of launch. We'll name the firm publicly once the engagement is formally structured.
We're in active evaluation with several Australian manufacturers. The selection will be locked once the formulation is finalised and pricing is benchmarked across candidates. We'll be transparent about who we choose and why.
Ben, an Australian founder diagnosed with coeliac disease in 2019. Built Gutline because, after five years of cycling through supplements that were never designed for the way his body now worked, he realised the product he needed didn't exist, and neither did one for the broader gluten-free community.
This section will be the most frequently updated. Returns visitors will see what's moved since their last visit.
The supplement industry is full of claims that sound impressive but won't hold up to scrutiny. Some explicit commitments about what Gutline will NOT do:
If you spot something in this document that looks wrong, contradicts research you know, or seems overstated, please tell us. Email support@gutline.com.au. We'd rather hear pushback now than at launch.
The studies and sources cited throughout this document. We'll add to this list as the formulation evolves and new research is published.
We send our waitlist meaningful updates: formulation milestones, manufacturer decisions, what we're learning. Not marketing emails. Two emails maximum before launch. Founding members get 25% off their first three boxes.
Join the waitlist →IMPORTANT INFORMATION The information on this website is provided for general educational purposes only and is not intended as medical advice, diagnosis, or treatment. Gutline is a nutritional supplement in development. References to ingredients or research reflect current information and are not claims about the finished product treating, curing, or preventing any disease. Always consult with a qualified healthcare professional before starting any new supplement, particularly if you are pregnant, breastfeeding, taking prescription medications, or managing a medical condition. Coeliac disease requires a strict gluten-free diet as the only effective treatment; supplements do not replace this.