Collagen
Collagen — the most abundant protein in the body and the main structural component of the skin's dermis, forming a fibrous network that gives skin its firmness and strength. Produced by cells called fibroblasts, it provides the scaffolding that supports overlying tissue, and its gradual decline contributes to visible signs of aging.
Key points
- Collagen is the most plentiful protein in human skin, making up much of the dermis by dry weight.
- It is synthesized by fibroblasts and assembled into triple-helix fibers that provide tensile strength.
- Natural collagen production declines with age, and sun exposure accelerates its breakdown.
- Enzymes called matrix metalloproteinases break down collagen as part of normal turnover and in response to UV damage.
- Vitamin C is a required cofactor for the enzymes that build stable collagen fibers.
Frequently asked
Does applying collagen to the skin replace lost collagen?
Topical collagen molecules are generally too large to penetrate into the dermis where collagen resides, so they mainly act as surface hydrators. Ingredients like retinoids and vitamin C are more associated with supporting the skin's own collagen production.
What causes collagen to break down over time?
Collagen declines with natural aging and is broken down faster by UV exposure, which triggers enzymes that degrade it. Lifestyle factors like smoking can also contribute.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
