Glossary

Collagen

Written by Reviewed by the SYNC editorial team Published Last reviewed Editorial standards

Collagen — the most abundant structural protein in the body and the main building block of the dermis, forming a fibrous network that gives skin strength and support. Produced largely by fibroblasts, it works alongside elastin to keep skin firm and resilient.

Key points

  • Collagen provides the tensile strength and structural scaffolding of the dermis.
  • There are many types of collagen, with types I and III being the most prevalent in skin.
  • Natural collagen production tends to decline with age and is further affected by sun exposure and other environmental factors.
  • Collagen in skincare is often included for its moisturizing and film-forming properties on the skin's surface.

Frequently asked

Does applying collagen to the skin replace lost collagen?

Topical collagen molecules are generally too large to penetrate deeply and mainly act as surface moisturizers rather than directly replacing collagen in the dermis.

What causes collagen to break down?

Collagen breakdown is influenced by natural aging along with factors such as ultraviolet exposure, pollution, and lifestyle habits that promote oxidative stress.

Related topics

This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.

Encyclopedia

Further reading

This entry was written and checked against the sources below. They are published by clinical and scientific bodies, they are listed most readable first, and each one opens in a new tab. They are background for the whole entry rather than footnotes to individual sentences.

  1. Biochemistry, Collagen Synthesis StatPearls (NCBI Bookshelf) Reference text ncbi.nlm.nih.gov
  2. Age-related dermal collagen changes during development, maturation and ageing – a morphometric and comparative study PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  3. Role of Age-Associated Alterations of the Dermal Extracellular Matrix Microenvironment in Human Skin Aging PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  4. Collagen structure and stability PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov
  5. Collagen type distribution and macromolecular organization of connective tissue in different layers of human skin PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov

SYNC does not publish medical advice. Nothing here replaces a consultation with a doctor or a pharmacist about your own skin.