Biology, genetics, chemistry, dermatology, research.
Hair & Science
Accessible science with credible sources — easy to read, backed by research.
Evidence-based
Beginner
Hair Biology
Why does hair curl?
The shape of a strand is decided before it ever leaves the scalp. Follicles, keratin, and genetics — explained in plain language.
Evidence-based
Hair & Science
The genetics of hair texture
Why there isn't a single switch marked CURLY.
Evidence-based
Hair & Science
Inside the hair follicle
A tour of the small, complex structure that builds every strand.