vitamin d has been in the news recently as several research projects have highlighted its vital role in the maintenance of normal bone health its involvement in the normal function of the immune system & its contribution to normal muscle function.our bodies obtain vitamin d from two sources our diet & from the action of sunlight on our skin which drives the natural production within the body. if we all had plenty of sun then we would have plenty of vitamin d but in reality we do need to obtain some from our diet particularly during the winter months & particularly in the elderly as the body’s ability to manufacture vitamin d declines with age.this product can be taken in addition to any of our multis to provide a safe intake of vitamin d.fantastic valuejust 3p per dayperfect potencytwice the rda in a small tabletuk made & testedpharmaceutical gmp standards