Wild fatty fish, such as herring, sardines or mackerel, is a very good source of valuable unsaturated fatty acids Omega-3 EPA and DHA and vitamin D. Many fish prepared for children (bickering, fish sticks, tilapia and pangasius) are lean fish and contain hardly any of these important nutrients. The Kids Brain Building Blocks contains Pure Arctic MSC Fish Oil with Vitamin D and is for anyone who has trouble with oily fish. One dessert/coffee spoon of Pure Arctic Fish Oil contains the Omega-3 fats of (converted) more than half a herring. The vitamin D in fish oil is important for your children to maintain strong bones and teeth. Vitamin D also ensures good resistance and plays a role in maintaining strong muscles. Especially during the winter months and in the spring, taking extra vitamin D (e.g. in fish oil) for your child is recommended.