| Products and Active Ingredients. |  |
Products and Active IngredientsFor decades, cosmetic ingredients have been tested for their levels of comedo-genicity;
the rabbit's ear has been used for these studies. Results are often imprecise,
however, since the rabbit ear differs histologically from human skin. In addition,
ingredients tested individually can show different readings than when combined.
Each individual's tolerance to a specific product may also vary.
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