Bedtime: Often times, the active ingredients can be inactivated by the sun.
Answered 4/26/2013
5.3k views
Depends on product: Retin-a and retinol are usually used at nighttime. Many other products are applied in the morning.
Answered 7/1/2014
5.1k views
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
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