Kosas mini concealer11/26/2023 It's possible that many of the similar claims online are also a result of not reading the expiry labels, especially given the lack of context attached to them. So while the Redditor's claim that started all this conversation ultimately can't be written off as completely invalid, according to their own timeline, they allege that they spotted the mold three months after that "product after opening" cutoff. Each bottle also has a " product after opening symbol" that indicates the estimated amount of time a customer has to use the product after opening - for the concealer, it’s six months. The brand also explains on its FAQs page that every unopened Kosas product "has a shelf life of two to three years depending on whether they contain water," which this concealer does. How Long Is Kosas Revealer Concealer Supposed to Last? Romanowski continues, saying that it would have been better for Kosas to use a robust preservative system that includes methylparaben and propylparaben because they are particularly effective against mold and fungi and can work at a wider pH range. Unfortunately, if this product is not formulated at a pH of below 5.0, then microbes of mold can grow." There's no way to know what pH level the concealer was formulated at, but Romanowski explains that above a pH of 5.0, the preservatives that Kosas formulates with don't work as intended. "Their preservative includes potassium sorbate, sodium benzoate, and phenethyl alcohol. "They have chosen something which, in my view, is an inferior preservation system," Romanowski explains. Cosmetic chemist Krupa Koestline also weighed in, explaining that the strength and efficacy of these preservatives are affected by pH and electrolytes, which makes them less effective than some non-clean products on the market which are more stable. What's in the Kosas Revealer Concealer Formula?Īfter taking a look at the formula of the Kosas Revealer Concealer, cosmetic chemist Perry Romanowski tells Allure that the preservatives used in the products aren't the most effective. While you could chalk all this up to the harsh truth that some products just won't be compatible with everyone's skin, the potential for mold is too concerning to leave unaddressed, so we dug a little deeper. Water, Ethylhexyl Olivate, Octyldodecanol, Undecane, Polyglyceryl-2 Dipolyhydroxystearate, Glycerin, Mica, Calcium Sodium Borosilicate, Caprylic/Capric Triglyceride, Niacinamide, Polyglyceryl-3 Diisostearate, Galactoarabinan, Tridecane, Propanediol, Cetyl Alcohol, Glyceryl Oleate, Sodium Hyaluronate, Palmitoyl Tripeptide-5, Panthenol, Squalane, Caffeine, Arnica Montana Flower Extract, Artemisia Capillaris Flower Extract, Ethyl Ferulate, Sodium Gluconate, Polyhydroxystearic Acid, Maltodextrin, Pentylene Glycol, Lecithin, Hydrogenated Lecithin, Tocopherol, Phenethyl Alcohol Active Ingredient: Zinc Oxide (7.5%)Īqua, Caprylic/Capric Triglyceride, Mica, Octyldodecanol, Ethylhexyl Olivate, Polyglyceryl-2 Dipolyhydroxystearate, Undecane, Glycerin, Polyhydroxystearic Acid, Tridecane, Galactoarabinan, Polyglyceryl-3 Diisostearate, Glyceryl Oleate, Helianthus Annuus Seed Wax, Lecithin, Panthenol, Sodium Hyaluronate, Palmitoyl Tripeptide-5, Caffeine, Squalane, Dunaliella Salina (Algae) Extract, Tocopherol, Maltodextrin, Arnica Montana Flower Extract, Helianthus Annuus (Sunflower) Seed Oil, Rosmarinus Officinalis (Rosemary) Leaf Oil, Foeniculum Vulgare (Fennel) Fruit Oil, Potassium Sorbate, Sodium Benzoate. Revealer Skin-Improving Foundation SPF 25
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