Problem Solving At Glow Recipe, Chang and Lee have opted for tinted jars that have been coated to protect the retinol formulas from UV rays. They also always recommend storing actives in a cool, dry location away from direct sunlight.
Don't stockpile retinol because of how readily it degrades. Prystowsky suggests only buying what you need for a month at a time. Be sure to look at the "best use by" date on bottles.
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