Vitamin D3 is a fat soluble vitamin, so we have developed D Lux 100 to be oil-based (using natural sunflower oil), so increasing it retention within the body. By applying it directly into the mouth, ideally under the tongue, it is absorbed directly into the blood system rather than having to be processed by the digestive system & major organs. This ensures no loss during the absorption process. The solution has been microemulsified to ensure the particle size is optimal for absorption in this way. The source of vitamin D3 is lanolin, collected from sheep wool. A natural source & suitable for vegetarians. The sheep used graze on the Preselli Mountains in West Wales. It may not seem sunny there but they have developed a very efficient process in synthesising what UVB rays there are. & there's a plentiful supply! Vitamin D (for humans this is D3) is essential, along with magnesium, to absorb calcium. Without D3 & magnesium, calcium is simply not soluble. It will not enter our bones & settle in the soft tissues around our joint, in our muscles & in our blood cholesterol. Calcium is very good for us but only if we can absorb it. Many recent studies have shown the importance of vitamin D in diabetes & cancer prevention. Only last month a conference organised by the world famous BARTS college invited doctors & professors from around the world to discuss the global health implications of our growing vitamin D deficiency.