Kiehl's Apothecary Skin Strengthening Concentrate

Kiehl's Apothecary Skin Strengthening Concentrate

This serum is discontinued and is really just a carrier oil for 2 active treatment serums that would be “prescribed” and mixed into this product. So unless you havesuper high potency squalane and/ or Retinol concentrate that will Mix in with this serum-it is no good. It does nothing on its own.

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