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People receive less than half the sun protection that is expected from tanning beds. The problem is not the lotion, but the careless way to apply it, according to scientists.
In theory, the use of a sunscreen with factor 15 should be sufficient to prevent damage from the sun. But in reality, people need 30 or 50 factors to be safe, say researchers at King's College London, UK
The typically applied Factor 50 lotion would provide, at best, 40% of the expected protection, according to Anthony Young, of the team of scientists who measured the amount of protection obtained with different amounts of sunscreens and different protective factors.
The sunscreen should be applied in sufficient quantity, which many do not do. A person should apply at least six tablespoons of cream, the equivalent of 36 grams, to cover the body of an adult.
Researchers advise more than half a teaspoon for each arm, face, neck and ears and more than one teaspoon for each leg, chest, abdomen and back. back. Areas such as the sides of the neck, temples and ears are usually forgotten. In addition, sunscreen should be reapplied whenever necessary.
According to the BBC, the British Association of Dermatologists further advises to apply the lotion 15 to 30 minutes before leaving the house, apply again as soon as you are out and reapply at least both hours and immediately after swimming.
Some sunscreens indicate that they are water resistant, which means they retain some sunscreen properties after getting out of the water. However, up to 85% of a product can be removed by a towel, so it should be reapplied after sweating, for example.
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