Evaluation of TYR Sphere

Inclusion Criteria: * Diagnosed with tyrosinaemia. * Aged ≥ 3 years. * In the opinion of the Investigator, can comply with the study protocol and take at least one sachet of the study product per day. * Willingly given, written, informed consent from patient or parent/guardian. * Willingly given, written assent (if appropriate). Exclusion Criteria: * Individuals who are allergic to milk, fish and soya (these allergens are inherent in the study product ingredients). * Use of additional macro/micronutrient supplements during the study period, unless clinically indicated and prescribed by the Investigator (must be recorded in patient case report form CRF). * Women who are pregnant / breastfeeding at the start of the study or planning to become pregnant during the study period. * Individuals who, in the opinion of the investigator, are unable to comply with the requirements of the protocol. * Any co-morbidity, which, in the opinion of the Investigator, would preclude participation in the study. * Patients who are currently participating in, plan to participate in, or have participated in an interventional investigational drug, food or medical device trial within 30 days prior to screening visit.