MARNYS® Liquid Vitamin D is a food supplement with a high Vitamin D content on a extra-virgin olive oil base. 0.5 ml provide 5 µg  (200 I.U.) Vitamin D, equivalent to 100% RDA. Vitamin D contributes to the normal absorption/usage of calcium and phosphorus, the maintenance of normal muscle function, the maintenance of normal teeth and bones, the normal function of the immune system and it has a role in the process of cell division.