I take a Fultium D3 800iu capsule daily, I was diagnosed with low Vit D which is not uncommon in Scotland and I think the UK as our lack of sunshine means that we don't get enough from natural sources ie Sunshine 😀 especially in the winter in fact it has been suggested that the government was thinking about recommending that it should be something that all adults and children take especially in the winter I'm quite happy to take this dosage on a daily basis it works for me, obviously depending on results of individual blood tests etc some people might need more