Vitamin D - Why You Need it and How to Get Vitamin D - as part of the expert series by GeoBeats. Vitamin D is very crucial for bone health and strength, and a lot of people just are not getting enough Vitamin D. We are taking precautions and using sunscreen, and when we do that, we block the Vitamin D being absorbed by our skin. It has been shown to help with immunity, and has also been linked to the prevention of breast cancer. Your best sources of Vitamin D are going to be of course your milk products and dairy products, but other products such as salmon, mackerel, and herring are also excellent sources of Vitamin D. Those are the top ones. Those are the ones that we would usually recommend. I mean you do have some of your green vegetables that are a source of Vitamin D, but you are really wanting to try to get three really good sources in per day. So I typically will tell someone to try and get at least two dairy products in per day and then also add upon that some type of fish if you can. If not, then just try to get all three from the milk and dairy section.