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.
Contacting a seller. To contact a seller, use the Ask a question link in the listing. Click the Ask a question link near the bottom of the listing. (You may be asked to sign in.). On the Find answers page, choose the topic that best fits your question, and look for your question.