GutGutGoose

Building GutGutGoose (YC S26), creating personalised probiotics for those that care about their health.

GutGutGoose makes personalized probiotics for people dealing with chronic gut symptoms like bloating, energy crashes, and brain fog that generic supplements and standard clinical workups have not resolved. After subscribing, customers send in an at-home stool sample, and the company uses AI, microbiome sequencing and metabolic modeling to design a formula matched to that individual gut. The platform analyses over 300 bacterial strains to build the blend, and the customer receives a plain-language report explaining what is happening in their microbiome alongside the pill itself. What sets this launch apart is the follow-through. Rather than shipping a static supplement, GutGutGoose retests every three months and reformulates based on how the microbiome has shifted, which the company positions as proof the product is doing something beyond placebo. The launch tweet also flags a satisfaction guarantee tied to that retesting loop, aimed at a category where efficacy is famously hard to demonstrate to individual buyers. The company was founded by childhood friends Anis Mihrshahi and Leon Mojarrabi, who are students at the University of Southern Queensland and Griffith University, respectively , and is relocating from Queensland to San Francisco for Y Combinator. Gutgutgoose has joined Y Combinator, securing US$500K to develop personalized probiotics using AI, microbiome sequencing and metabolic modeling , and this launch marks its public debut to US customers as part of the S26 batch.

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