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.
1 Click on Start Selling to begin your listing. 2  You could also search for the book on Amazon as though you were buying it. 3  Once you locate the book and go to its corresponding item detail page, click on the Sell on Amazon button on the right side of the screen to begin your listing.