Alpha vs Beta Keratin: Key Differences Explained
Alpha keratin is the tough, helical protein that builds human hair and nails; Beta keratin is the pleated-sheet protein that armors reptile scales and bird feathers.
People confuse them because “keratin” is marketed on every shampoo bottle, yet the products never say which kind is inside or why your hair isn’t suddenly feather-soft.
Key Differences
Alpha keratin packs into twisted cables rich in cysteine, giving strength and flexibility; Beta keratin aligns into rigid sheets with less sulfur, producing lightweight hardness and water resistance.
Examples and Daily Life
Your hair conditioner uses hydrolyzed alpha keratin for shine, while the beak on your parrot’s toy is pure Beta keratin—try bending both and feel the contrast.
Is my hair Beta keratin?
No, human keratin is always alpha type.
Can reptiles grow Alpha keratin?
Only in claws and small skin patches.