Inclusion Criteria:  Age 18-29 years GAD-7 Score ≥ 5 PHQ-8 Score ≥ 4 English language fluency. Overall good health.  Exclusion Criteria:  Self reported BMI ≥ 30 kg/m^2. Current tobacco smoker. Diagnosis of anxiety, depression/major depressive disorder episode, psychosis, schizophrenia, bipolar disorder, eating disorders, haemophilia, or life-threatening disease during the preceding six months from the beginning of the trial. Use of antidepressant drugs during the preceding six months from the beginning of the trial. Participation to psychological and/or behavioural interventions during the preceding six months from the beginning of the trial. Inability to ingest pills. Pregnancy. Breastfeeding. Known allergy or intolerance to LCn-3 PUFAs, seafood and any of the constituents of the supplement under investigation. High intake (more than twice per week) of oily fish (e.g. herring, pilchards, salmon, swordfish, sardines, sprats, trout or mackerel). Use of fish oil supplements during the preceding six months from the beginning of the trial. Inability to participate in the study for 24 consecutive weeks.