| Résumé : |
It is well known that sunscreen prevents sunburn, reduces the risk of metanoma and reduces the sun-retated ageing of skin. Consumers not only demand that sunscreen be effective, they also prefer sunscreens with organoleptic properties.
In addition, there is a growing trend for sunscreens to contain natural ingredients that can safely be applied to human skin and which are environmentally safe. These are some of the more recent challenges that manufacturers face as they design their sunscreen formulations.
The manner and extent of regulation of sunscreens vary across the world. In the USA, the FDA regulates sunscreens as a drug. In Canada, depending upon its formulation, a sunscreen might be classified either as a natural health product or an over-the-counter drug.
In the EU, Chinese and Japanese sunscreens are regulated as cosmetics. Australia regulates sunscreen as a cosmetic if its sun protection factor (SPF) is a secondary function and as a therapeutic/drug if SPF is a primary function.
The primary focus of most regulations is a sunscreen's UV filter, the component that provides protection from UV rays. UV filters are classified in three wavelengths regions : the longest is UVA1 (340-400 nm), the intermediate is UVA2 (320- 340nm) and the shortest is UVB (290-320 nm).
Although it is common not to differentiate between UVA1 and UVA2, some UVA filters do not have optimal performance in both of these regions. UVA rays have less energy and do not burn the skin litre UVB rays, but they have been shown to accelerate skin ageing, as well as having the potential to contribute to melanoma. |
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Ajouter le résultat dans votre panier Affiner la rechercheZinc oxide : Winning choice for a sunscreen UV filter / Paul Williams in GLOBAL PERSONAL CARE, Vol. 23, N° 4 (04/2022)
