You know which SPF you need - so using it is now self-explanatory!? Not quite, because there is still a small plot twist.

To achieve the SPF declared on the packaging, an application quantity of 2 mg/cm2 is required. So you have to cream very generously!

As an illustration:
• You need about two finger lengths (= length of the index and middle fingers) of cream for your face and décolleté alone. They are actually finger LENGTHS, not widths.
• Based on the entire body of an adult, around 30 to 40 ml must be calculated, i.e. around a fifth of a 200 ml bottle! Approximately 20 ml of sunscreen is recommended for a child aged ten.

If you now think about the last time you used so much cream - you are not alone!

Experts estimate that in practice only a third of the specified sun protection factor is actually achieved. The protective effect is usually OVERestimated. Because if you apply a sunscreen with SPF 50 but only half the required amount, you don't have SPF 25 - as you might imagine. Because the protective effect does not fall off linearly, but exponentially: the square root of 50 results in an SPF of 7. And unfortunately that is actually not enough!

However, this is not primarily due to us, but rather due to the fact that we have to apply an unphysiologically high layer of product in order to achieve the specified SPF. I also often find it difficult to adhere to the quantities given, especially when I apply the almost obligatory sunscreen every day after facial care.

Despite sunscreen, a certain dose of radiation reaches the skin per unit of time. This adds up over the course of the day until the skin's tolerance limit is reached. This time can only be used once per day, otherwise the skin's repair mechanisms will be overloaded. Even repeated applications do not extend this time. However, by regularly reapplying the cream, we ensure that the light protection film on the skin, which gets 'holes' through sweating, bathing or abrasion (when drying off), is 'refilled'.