Retin-A: Retin-a users reported improvements in skin texture, including diminished wrinkles and brown spots. Early studies soon confirmed its anti-aging effects. In 1988, dr. Voorhees and his colleagues at michigan published the first double-blind study of retin-a’s effect on photodamaged skin and found that all 30 patients who completed the 16-week study showed statistically significant improvement.
Answered 7/1/2014
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