What does 'noncomedogenic' even mean? Here's what we know:
considered anything below a 50% increase in comedones as noncomedogenic rather than using the numbered scale at all.
This isn’t to say that comedogenicity ratings are inherently bunk; strongly comedogenic ingredients can absolutely cause breakouts in acne-prone skin if they're present at high enough concentrations. Just remember that those handy little numbers are still based on qualitative data, so there’s room for error—particularly at the low end of the scale, meaning that you may still have issues with something that appears to be noncomedogenic.
So, testing the ingredients at levels that aren’t realistic to the way you might find them in actual products makes it hard to really interpret comedogenicity ratings. For instance, full-strength isopropyl myristate and 10 percent D&C Red No. 27 both rate a 5 on one comedogenicity scale, but you won’t find anything near those levels in cosmetic formulations.
So, just because a product claims to be noncomedogenic doesn’t mean that it’s totally free of ingredients that might cause you to break out. In the end, the decision to slap a “noncomedogenic” label on a product is entirely up to the discretion of cosmetics companies, which are on the honor system to use the term appropriately.
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