The fundamentals.
Hair 101
Everything starts here: what hair is, how it grows, why textures differ, and how to care for the hair you have.
Evidence-based
Hair 101
What is hair actually made of?
Keratin, cuticle, cortex — a guided tour of a single strand.
Evidence-based
Hair 101
How does hair grow?
Anagen, catagen, telogen: the growth cycle explained simply.
Evidence-based
Hair 101
Understanding hair porosity
What porosity means, how to think about it, and why it matters for care.