The Boots Star rating system is a popular method used to measure the level of UVA protection offered by a sunscreen product. The rating is based on the ratio of UVA to UVB protection provided by the product.
The Boots Star rating system ranges from 0 to 5 stars, with a higher number of stars indicating better UVA protection. To achieve a higher rating, a product needs to provide a higher level of UVA protection relative to its UVB protection.
Our clinical testing service uses this method to evaluate a product's UVA/UVB absorbance ratio before and after exposure, providing cosmetic companies with reliable and accurate information on the level of UVA protection offered by their products. Consumers can use this information to make informed decisions when selecting a sunscreen product and protect themselves from harmful UVA rays, which can cause premature aging, skin damage, and skin cancer.