Buying in bulk can be an effective way to get more "bang for your buck" -- and in fact, vitamins are one of the things that you should always buy in large amounts. While the refrigerator is a good place to store vitamins intended for long-term use, the freezer is even better. Vitamins stored in the freezer can be treated much the same as those stored in the refrigerator. Be sure to package vitamins properly to maintain nutrient integrity.
Determine if the vitamins can be frozen. Some vitamins are specifically designed to be kept at room temperature. Contact the manufacturer of the specific brand before attempting to freeze them to maintain safety and ensure the quality of the product.
Remove a three-month supply of vitamins from the batch you wish to freeze. The three-month supply can be set aside for daily use, with the remaining stock placed in the freezer for long-term storage. Removing a small supply of vitamins from a larger batch means you will not need to take the supplements in and out of the freezer each day, thus preventing exposure to moisture and light.
Package the vitamins correctly. Keep vitamins intended for long-term storage in their original container -- other containers might deteriorate over time, ruining your vitamins. When you've finished a bottle of vitamins, keep the bottle to store your day-to-day vitamin stock. You may also find bottles designed for vitamin storage at some pharmacies.
Allow frozen vitamins to warm to room temperature before removing another three-month batch from the larger stock. Once you've removed the short-term supply of vitamins from the larger supply, close the container tightly and place it back the freezer for three more months.
Don't freeze liquid vitamins.