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.
On the left side of the page, click the âBy sellerâ link. Enter the sellerâs username. If youâre not sure of the sellerâs username, select the âShow close and exact username matchesâ option. Click the Search button. Tip: If you donât know the sellerâs username, try finding one item being sold by the seller.