Collagen
Medically reviewed: Dr. Murat Toktamışoğlu · 2026-05-21
Definition
Protein making up 75% of skin's dermal matrix, providing structural support. 28 types; Type I and III matter most for skin.
Detail
Production drops 1%/year from age 30. UV, smoking, sugar (glycation) cause additional damage. Most aesthetic treatments work by stimulating collagen renewal.