GutGutGoose

GutGutGoose sells personalized probiotics built from a customer's own gut microbiome. Each cycle starts with an at-home stool sample that the company sequences metagenomically and reads against symptom context and published strain evidence; it models that gut's metabolism, predicts which strains are likely to establish, and compounds a formulation around those candidates. A retest ninety days later measures what took hold, recording a baseline, an intervention, and an outcome.

Founded in Queensland, Australia, the company joined the LuminaX HealthTech Accelerator in 2025 and moved to San Francisco in June 2026 after acceptance into Y Combinator's Summer 2026 batch. It compounds in a Therapeutic Goods Administration-licensed Queensland facility and sells subscription tiers in the United States and Australia. Co-founders Anis Mihrshahi and Leon Mojarrabi frame the accumulated retests as the seed of a longer-term predictive dataset, describing the offering as a supplement rather than a treatment.