What Is Collagen? — The Skin's Structural Protein
Collagen is 70% of skin's dry weight. Topical collagen is largely useless; oral and stimulating ingredients are where the action is.
The science.
Collagen is a protein that gives skin structure and elasticity. The body produces less with age — by 30 we lose ~1% per year.
How it works
Topical collagen molecules are too large to penetrate skin meaningfully. What works: ingredients that stimulate the skin's own collagen production (retinol, peptides, vitamin C). And: oral collagen peptides for systemic support.
Right for which skin types?
Anyone over 25. Topical actives + oral collagen for compounding effect.
How to use it
Topical: focus on retinol + peptides + vitamin C, not collagen creams. Oral: 10g daily marine or bovine collagen peptides.
Side effects
Rare.
Top recommendations.
- Marine Collagen by Vital Proteins — $45 · Best evidence
- Collagen Peptide Serum by Glow Recipe — $48 · Topical-led
- Liquid Collagen by Vida Glow — $58 · Easier daily
Common questions.
Does topical collagen actually work?
Mostly no — molecules too large to penetrate. Look for collagen-stimulating ingredients (retinol, peptides) instead.
Marine vs bovine collagen?
Marine is closer to human collagen and better-absorbed. Bovine is cheaper. Both work.
How much oral collagen daily?
10-20g for clinical effect.