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What is the Superior Anti-aging Product, Glycolic Acid or Tretinoin? (photo)

I have been using retin-a micro .05% for about 7 years. I am 28 years old but everyone thinks I am about 22. At least that's what they say. Recently, a dermatologist told me that glycolic acid is a more effective anti-aging product (at the proper pH, of course). My skin is always flaky & reddish from the retin-a, even after all these years so I have been contemplating switching to glycolic acid but I don't want to lose the benefits of retin-a for something that will not deliver.

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