Scientific Opinion on the substantiation of health claims related to taurine and “immune system protection” (ID 611), “metabolism processes” (ID 613), contribution to normal cognitive function (ID 1659), maintenance of normal cardiac function (ID 1661), maintenance of normal muscle function (ID 1949) and delay in the onset of physical fatigue during exercise (ID 1958) pursuant to Article 13(1) of Regulation (EC) No 1924/2006