Brillia is a homeopathic supplement that is marketed to alleviate anxiety, stress, hyperactivity, and impulsivity in adults, teenagers, and children. It is available over-the-counter and does not require a prescription. The manufacturer claims that Brillia is most effective when taken for three consecutive months and then taking the fourth month off, but taking the fourth month off is not essential. Brillia is a small lentil-sized tablet that dissolves easily on the tongue. The active ingredient in Brillia is immunoglobulins, or antibodies, specific to a protein called S100B. This protein is involved in several processes in the brain and has been associated with certain neurological and mental disorders. These antibodies bind to S100B, reducing its activity in the body, which can supposedly reduce symptoms like hyperactivity and anxiety. Brillia is marketed to adults and children who are experiencing symptoms like anxiety, stress, hyperactivity, and impulsivity. The manufacturer claims that Brillia does not have any supplement or prescription drug interactions or cause any side effects. However, as this product is not FDA-regulated in the same way as prescription medications, a person should consider speaking with a doctor to establish whether it might be suitable for them. Despite positive customer testimonials, clinical evidence on its actual effectiveness is currently lacking.