Very few foods naturally have vitamin D. Fortified foods provide most of the vitamin D in American diets. 1  Fatty fish such as salmon, tuna, and mackerel are among the best sources.  Beef liver, cheese, and egg yolks provide small amounts.
Note: To contact a Seller requesting an invoice for an item Fulfilled by Amazon: 1  Go to Your Orders. 2  Click on the Seller's name, located below the item title. 3  Click on Contact Seller in More Information. 4  Fill out the information request form.
For all the general enquiries like buying or selling on the site, you can call the Amazon customer service number 0800 279 7234. This number can also be used if you need to give any feedback or complaint on the shopping experience. The phone lines are open seven days a week from 6am to 12 midnight.