This is a market research, observational study to evaluate the tolerability and acceptability of MCT supplements for young children, young people and adults with intractable epilepsy, GLUT-1 or PDHD from 3 years to adulthood.

Inclusion Criteria:

• Diagnosis of epilepsy requiring a ketogenic or a specialist diet as part of their treatment.
• Subjects new to taking or who are already taking an MCT product and are willing to try each of the 3 study products for 7 days each. 21 days taking product with 2 days between each new product trialled.
• Those patients who have been taking MCT in their diet should do so for a minimum of 4 weeks before commencement of the study.
• Patients aged 3 years of age to adulthood.
• Written informed consent obtained from patient or parental caregiver.

Exclusion Criteria:

• Presence of serious concurrent illness
• Investigator's uncertainty about the willingness or ability of the patient to comply with the protocol requirements
• Participation in any other studies involving investigational or marketed products concomitantly or within two weeks prior to entry into the study
• Any patients having taken antibiotics over the previous 2 weeks leading up to the study
• Patients already on and MCT product who have been taking it in their diet for less than 4 weeks
• Patients less than 3 years of age
• Patients over 20 years.

This study will be used for the registration and reimbursement for the products used as foods for special medical purposes.