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Retinoids in skin care. Advancing beyond tretinoin.
http://www.smartskincare.com/treatments/retinoids.html
Active retinol
http://www.smartskincare.com/treatments/retinol.html
http://www.skinbiology.com/otherbioactiveskinproducts.html
retinol decreases excessive breakdown of collagen and elastin in the skin. However, it has long been established that excessive retinol on the skin can cause acne in younger persons. While there is no hard-and-fast age when retinol ceases to cause acne, in general, persons under 25 are more likely to develop retinol-produced acne, while in persons over 45, retinol appears to have very positive actions on skin renewal.