Inositol is needed for healthy cell membranes and for optimal function of neurotransmitters in the brain. It also helps maintain insulin sensitivity and is commonly recommended for treating metabolic syndrome and its associated conditions, such as polycystic ovary syndrome (PCOS), failure to ovulate, high blood pressure, high triglycerides, and high levels of testosterone. (https://www.nejm.org/doi/full/10.1056/NEJM199904293401703); (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5097808/).
Because it optimizes neurotransmitter function in the brain, inositol has been found helpful in research for emotional wellbeing in people with mild depression, panic attacks and obsessive compulsive tendencies. (https://www.ncbi.nlm.nih.gov/pubmed/11386498); (https://www.ncbi.nlm.nih.gov/pubmed/7726322 (https://www.ncbi.nlm.nih.gov/pubmed/8780431).