10.05.23
US Patent No. 11,771,638 B2 (Isaac Thomas); Mary Kay Inc. patented a non-aqueous composition comprising ascorbic acid; a silicone oil; at least 15% by weight of an essential oil; propylene glycol; and glycerin. At least 50% of the initial amount of ascorbic acid in the composition remains stable when the composition is stored for at least one month at room temperature.
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