RT Book, Section
A1 Baumann, Leslie
SR Print(0)
ID 1174544515
T1 Overview of Aging
T2 Cosmeceuticals and Cosmetic Ingredients
YR 2015
FD 2015
PB McGraw-Hill Education
PP New York, NY
SN 9780071793988
LK dermatology.mhmedical.com/content.aspx?aid=1174544515
RD 2023/10/01
AB There  are  two  main  processes  of  skin  aging,  intrinsic  and  extrinsic.1  Intrinsic  aging  is  controlled  by  genes.  The  genes  that  contribute  to  skin  aging  have  not  yet  been  elucidated  although  some  are  thought  to  play  a  role  in  aging.  Extrinsic  aging  is  caused  by  external  factors  such  as  smoking,  excessive  use  of  alcohol,  poor  nutrition,  and  sun  exposure,  which  in  many  cases  can  be  reduced  with  effort.  It  is  believed  that  as  much  as  80  percent  of  facial  aging  can  be  ascribed  to  sun  exposure  (extrinsic  aging).2  It  is  also  speculated  that  some  factors  implicated  in  extrinsic  cutaneous  aging  may  impact  the  intrinsic  aging  process.3