, each tablet provides 10µg (400iu equivalent) vitamin d 3, one-a-day veggie friendly tablets, for immune system support, maintains bone teeth & muscle health these tablets provide the amount of vitamin d that the government has said everyone should consider taking as a supplement during the autumn & winter. this is due to a concern that diet & sunshine alone may not provide sufficient vitamin d for the body’s needs. vitamin d is found in some foods but for most people it is the action of sunlight on skin that produces most of the body’s requirements. but it is now recognised that our modern ‘indoor’ life & our cloudy climate means that vitamin d deficiencies are now common in the uk population. the government have identified several groups of people at particular risk of deficiency.there are an increasing number of health concerns linked to vitamin d deficiency & the newspapers have been widely reporting each new piece of research. this is a good product to choose if you are already taking one of our multis (most of which also have 400iu of vitamin d) or if you do get some sun exposure & just want to top up your vitamin d. however if you get very little sun then we recommend you consider taking our higher strength vitamin d 1000iu product.