Start with 2 drops under the tongue per day. Can be gradually increased to 20 drops (one dropper) per day or as directed by your health care practitioner.
NOTE: Premium Select Naturals Advanced Formula Vitamin D will coagulate when refrigerated. The best solution is to let it sit out at room temperature for 30 minutes prior to use then shake thoroughly to re-emulsify the product. Refrigerate again until the next use.