The purpose of this study is to investigate the effects of EPA- and DHA-enriched omega-3 polyunsaturated fatty acid dietary supplements on cerebral blood flow during a series of cognitive, mathematical subtraction tasks and subjective ratings of task difficulty before and after 26 weeks of supplementation

Inclusion Criteria:

• Aged 25 to 49 years inclusive
• Males and females
• Self-report of good health

Exclusion Criteria:

• English is not first language (some of the cognitive tasks have only been validated in native English speakers)
• Habitual consumption of oily fish exceeds one fish meal per week (see Appendix I)
• Habitual consumption of omega-3 dietary supplements in the previous 6 months
• Habitual use of dietary supplements within the last month (defined as more than 3 consecutive days or 4 days in total; some supplements that do not impact upon cognitive function e.g. garlic, protein, calcium are allowed. Please check with the research team if you are unsure)
• Are a smoker or consume any nicotine replacement products (e.g. chewing gum, e-cigarettes)
• Food allergies or sensitivities to any of the ingredients contained in the investigational product or any other foodstuff
• Pregnant, trying to get pregnant or breast feeding
• Body Mass Index outside of the range 18-35 kg/m2
• High blood pressure (systolic over 159 mm Hg or diastolic over 99 mm Hg)
• Currently taking blood pressure medication
• Currently taking blood thinning medication (e.g. aspirin, warfarin, heparin)
• Have a respiratory disorder that requires regular medication (Note: participants with asthma who only take their medication occasionally/as required are eligible for this study)
• Have frequent migraines that require medication (more than or equal to 1 per month)
• History or current diagnosis of drug/alcohol abuse
• History of kidney or liver disease, or other severe diseases of the gastrointestinal tract (e.g. iron accumulation, iron utilization disorders, hypercalcaemia, hypercalcaemia), that are likely to interfere with metabolism/absorption/secretion of the product under investigation
• History of neurological or psychiatric illness (excluding depressive illness and anxiety)
• History of head trauma
• Sleep disturbances and/or are taking sleep aid medication
• Blood disorders (e.g. anaemia, haemophilia, thrombocytosis)
• Diagnosis of type I or type II diabetes
• Heart disorder, or vascular illness
• Current diagnosis of depression and/or anxiety
• Over- or under-active thyroid
• Chronic gastrointestinal problems (e.g. Inflammatory Bowel Disease, Irritable Bowel Syndrome, celiac disease)
• Any known active infections
• Diagnosed with syphilis, hepatitis, the Human T - lymphotropic virus or the Human Immunodeficiency Virus
• Current or past breast cancer diagnosis and/or a mastectomy
• Health condition that would prevent fulfilment of the study requirements
• Currently participating in or in the past 4 weeks participated in other clinical or nutrition intervention studies