Pharmaceutical preparations for the treatment of cardiovascular disease, cancer, neurological conditions, cognitive and behavioural disorders, and amyotrophic lateral sclerosis; dietetic supplements, namely, polyunsaturated fatty acids adapted for medical use; food for babies; edible fish oils, plant oils and algal oils, oil containing omega 3, supplements containing docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), all for medical purposes