- Origin
Natural protein; hydrolyzed for cosmetic use
- Format
Hair mask, serum, conditioner
- Best time
Weekly hair treatment
What it is
Keratin is the protein that makes hair, nails, and the outer skin layer. The hair shaft is roughly 90% keratin.
How it works
Hydrolyzed keratin diffuses into porous, damaged regions of the cortex and binds via hydrogen bonds and salt bridges, temporarily restoring structural integrity.
The protocol
Once-weekly intensive mask on damp, clean hair. Leave 10–20 minutes, rinse thoroughly.
Sourcing
Vegan keratin alternatives derived from wheat or soy are widely available and equally effective for most hair types.
Honest caution
Over-use can leave hair feeling brittle — protein needs to be balanced with moisture.
What it supports
- Damage repair — Fills porous, processed, or heat-damaged hair shafts.
- Shine and slip — Smoother cuticle reflects more light.









