Once a beauty product is opened, it becomes vulnerable to bacterial contamination, which can cause allergies.
Applying a sunscreen you opened a year ago on your skin may not be the best choice, because its effectiveness drops dramatically around 12 months after opening.
In any case, it is essential not to handle the product too much by avoiding leaving the tube open too long so that bacteria cannot enter. Also, you need to wash your hands regularly before touching the tube, because if bacteria manage to grow in the cream, it can cause skin allergies and rashes.
Heat, excessive light and humidity are some of the factors that most rapidly alter the composition of the product, which becomes ineffective against sunburn.
Sunscreens should be stored in a cool, dry place preferably away from light.
If you're looking for a product that is fresh every day as if just opened, you've come to the right place.