The benefits. Helps with normal functioning of your heart, brain and blood pressure(omega 3 EPA/DHA) Aids the health of blood cells and nervous system, reducing tiredness and fatigue (vitamin B3 and B12) Supports your immune system and contributes to normal thyroid function (selenium) Supports the immune system, muscles and bones (vitamin D) What goes in. 100% Spanish mackerel fillets, 35% organic extra virgin olive oil, salt. What's kept out. Nitrites, sugar, dolphin and bycatch. Did you know? Did you know that most commercial fish are from unnatural farms? In these artificial environments, overcrowding leads to pollution and algae blooms. Such high-density living also means that fish are more likely to develop parasites and become diseased. Not something you want to think about when tucking into your tuna sandwich. Geography. Sustainably caught in Spain. Nutritional Information.