Heat finally arrived, taking with it the purchase of organic sunscreen and the questions that come with it. We offer in this article an overview of all the questions we receive each year from consumers.
In a simplified way, the SPF (Sun Protection Factor) is the indicator of the level of protection of a product against sunburn. To determine it, we look at a volunteer person how long it takes to get sunburned with and without protection. By comparing the two durations, we obtain a ratio which is the SPF.
Example: a volunteer exposed to UV rays takes 10 minutes to blush without protection, and 3h20 to blush with sunscreen (200 minutes). This gives us the following ratio: 200/10 = 20, which is an SPF 20. In general, this means that with an SPF20 cream, you have 20 times more time before taking the sunburn than you would have taken without protection.
Although both UVA and UVB are in the ultraviolet class, there are several important differences between them. UVB is the rays responsible for tanning and sunburn. They do not go deep into the skin. UVA is responsible for premature aging of the skin. They penetrate deep into the skin.
UVA as UVB can cause diseases like skin cancer, hence the importance of protecting yourself from both. To have the right to be marketed, sun protection products must necessarily protect against both types of UV.
Whether traditional or organic, all sun creams are tested before being marketed. These tests are mandatory and aim to verify that the product plays its protective role against ultraviolet and to quantify its power of protection (the famous SPF we mentioned earlier). To date, several methodologies are recommended by regulation for these mandatory tests:
But there are several others not included in the recommended methods.
NB: In vitro method ISO 24443 is not suitable for mineral sunscreens and is currently being revised by ISO.
Each year during the summer, it happens that organic solar products are subject to unjustified attacks. They are presented as less effective than conventional products, even though they undergo the same control process.
Several reasons can explain these criticisms:
The sunscreens get their efficiency from the solar filters present in the formula. There are two types to date:
The tests we mentioned earlier in the article are made with a quantity of 2 mg / cm2. So that's the amount we have to apply to get the best protection. For information, 2mg / cm2 is equivalent to 6 teaspoons to apply on the whole body of an adult.
The official recommendation is to apply sunscreen every two hours. But for some types of skin, this is not enough and it would reapply cream even more often! The time of the day is also to be taken into account for the frequency of application. Indeed, the solar energy varies according to the hours of the day: 20 minutes of sun around noon are not at all comparable to 20 min of sun around 17h ...
It is ideal to put cream as soon as you are outdoor for a long time. And even if you are under the clouds or in the shade! Indeed, UV rays are reflected on certain surfaces such as snow or sand. The UV reaches you even if you are in the shade of a tree or a parasol ... 😉
At the time of buying sunscreen, there are 3 main questions to ask: conventional or organic, which SPF and which format?
To discover: sunscreens carrying Cosmebio label
No. Despite their good effectiveness, no cream can claim to stop 100% of ultraviolet rays. In addition, consumers rarely put the recommended dose of cream at 2 mg / cm2. With each exposure, a more or less important dose of UV thus arrives to penetrate the skin, thus activating the melanin (pigment which determines the color of our skins, eyes and hair), and thus the mechanism of tanning.
Yes. Like any cosmetic, sunscreen has an expiry. This expiry information can take several forms on the packaging:
We hope you enjoyed this little focus on sunscreen. Now you have all the keys to protect yourself!