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.
You can contact a Marketplace Seller both before and after placing an order. To contact a Marketplace Seller before placing an order: 1  On the Product Detail page click on the name of the Seller. 2  On the next page, at the bottom right under Further Information, click Contact the seller.