Scientific Opinion on the substantiation of health claims related to methylsulphonylmethane (MSM) and contribution to normal collagen formation (ID 353, 388, 389, 394, 1695, 1741, 1874), maintenance of normal hair (ID 353, 1741, 1874), maintenance of normal nails (ID 1695, 1741, 1874), maintenance of normal acid-base balance (ID 387), “strengthens the immune system function” (ID 390), maintenance of normal bowel function (ID 391), contribution to the normal cysteine synthesis (ID 392) and “vitamin production needed for correct function of metabolism” (ID 393) pursuant to Article 13(1) of Regulation (EC) No 1924/2006