I've used this anti wrinkle, anti aging, over the counter product for over 2 years, after I decided it was time to take my skin care seriously and I had developed stubborn adult acne. After a few months, it cleared the acne (went through a fast stage of increased oiliness) shrank my pores, and smoothed and evened my skin!!
I have to bump down to level 3 in the winter (occasionally using L6 or mixing the two).The results are amazing. This one absorbs more quickly into the skin than the other retinol's I've tried, and I'm convinced that this minimizes irritation! For me, no side effects as long as you don't start with the highest strength level right away.
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