At the moment, we do not offer the option of adding vitamin D to your blend. We don't add any extra vitamins/minerals in our protein powders, so the nutritional profile of your personalized protein powder blend comes 100% naturally from the foods they are derived from (i.e. milk, peas, rice).
That said, we're always open to suggestions! If there is an ingredient you would like to see in our lineup, let us know at firstname.lastname@example.org