Scientific Opinion on the substantiation of health claims related to various food(s)/food constituent(s) claiming biotransformation of xenobiotic substances (ID 1378, 2388, 2401, 3900, 3942, 4039, 4510, 4513, 4544, 4628, 4639), “elimination”, “cleansing” and “purification” (ID 1347, 4024, 4442, 4457), elimination of heavy metals (ID 1887, 3156), and maintenance of normal bowel function (ID 4039) pursuant to Article 13(1) of Regulation (EC) No 1924/2006