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.
Amazon publishers sell their books to Amazon, which then sells those books to customers. Amazon sellers are businesses and individuals that sell products at Amazon. They can ship the products themselves or use the Fulfillment by Amazon program to fulfill customer orders. In addition, theyâre the seller of record for a given order, taking care of customer service and returns. Sellers manage their inventory on Seller Central.