From what I've read, both are essentially the same. They both use the same ingredient Tretinoin. The only difference with the micro is that the ingredients are put into microspheres which release the Tretinoin slowly over time. This is supposed to keep the skin from getting irritated. So I guess to answer your question, regular Retin-A is probbaly faster, but also has a bigger chance of causing skin irritation.
oh btw, Retinol is not the same thing is Retin. Retinol is just a fancy name for regular Vitamin A. Retin is a prescription drug called Tretinoin, which is also a form of Vitamin A, but alot more potent.
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