Ideally, all supplements should be protected from the sun and stored as dark as possible. Opened liquid products should be used up quickly after opening. When not in use, these can also be kept in the fridge for a short time during the summer. Products in powder form should be carefully sealed to protect from moisture. The BBD always refers to the last day of the month. A product is not necessarily inedible after the best-before date has expired. From this point on, however, the consistency and appearance of the product can change, and vitamins and minerals can gradually evaporate and no longer have the usual effect.