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You've heard of Retin A and retinol but you're not sure what's the difference. Why is Retin A prescription-only while retinol is sold over the counter and often mixed with other ingredients in skin care formulas? Why does Obagi sell various strengths of tretinoin? And another thing, why is Retin A also called tretinoin? You've come to the right place to get all of your questions answered.

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