Natural vitamin E can be damaged by exposure to natural light and/or to excessive temperatures. To get the most benefit from the vitamin E in Progest-E, store the product refrigerated, or in a cool dark place.
Natural vitamin E is also more viscous when cold. To facilitate dispensing drops when storing refrigerated, use the following procedure: With the cap on, put your bottle of Progest-E upside down in a small juice glass to store in the fridge. Remove the glass containing the bottle of Progest-E from the fridge approximately 20-30 minutes before using. This will allow the solution to get to room temperature making dispensing the drops easier.
Storing the bottle upside down also ensures that the solution is always in the dropper tip ready for use.