A member asked:

How long does it take for retin-a to begin working?

A doctor has provided 1 answer

Most people...: ...Notice superficial redness and peeling almost immediately - often after the very first application. Deeper effects, such as stimulation of new collagen formation, takes longer - weeks to months - because collagen regenerates so slowly. The more potent formulations work more quickly than milder ones -- but they also cause more irritation of the skin.

Answered 10/8/2018

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How long would retin a (tretinoin) take to clear acne?

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