As interest in the gut-brain axis grows, what nutrients and bioactives are understood to affect cognition and mental health through their impact on the gut? How can innovations like biosensors be leveraged to gain data-driven insights around the gut-brain connection to a level of precision not yet reached? From clinical trials to funding, what challenges make it difficult to discern the microbiome's influence on specific conditions, from anxiety and depression through to Parkinson's and Alzheimer's? What is necessary in terms of policy and labelling to ensure that product claims are not outlandish and have a clear message around necessary intake to enjoy the health benefits?