Grow out your hair knowledge.

What is hair anyway?

How does it grow? It takes about two minutes to become well-versed in how we humans grow our hair. This guide applies to everyone, whether you're male or female.

Hair is protein.

We have long fibers of a protein called 'keratin' growing out of our bodies. Hair and nails have a lot in common. They are both made of keratin.

Hair is protein.

We have long fibers of a protein called 'keratin' growing out of our bodies. Hair and nails have a lot in common. They are both made of keratin.

Hair is not alive.

That's why getting our hair cut doesn't hurt.


Hair growth comes from within.

Visible hair is simply the by-product of a much deeper process. Hair grows from follicles which are little pockets in your scalp. We are all born with about 5 million follicles.

Hair growth comes from within.

Visible hair is simply the by-product of a much deeper process. Hair grows from follicles which are little pockets in your scalp.

The root cause of growth.

Hair begins growing from a root at the very bottom of the follicle. Little blood vessels feed the hair and support cells with nutrients that make your hair grow.


A little push.

A tiny muscle, the "arrector pili," contracts to make your hair stand on end.

A little push.

A tiny muscle, the "arrector pili," contracts to make your hair stand on end.

Oil helps move things along.

Every hair passes an oil gland. That's what can make hair "greasy."


It's normal to shed hair.

Every day, we shed 50-150 hairs.*

It's normal to shed hair.

Every day, we shed 50-150 hairs.*

*That's why, sooner or later, you may find a hair in your sandwich.


All follicles need rest.

After up to 7 years of growth, a follicle needs to rest for about 3 months before the growth cycle begins again.

All follicles need rest.

After up to 7 years of growth, a follicle needs to rest for about 3 months before the growth cycle begins again.

Some follicles just keep on resting.

Some people's follicles start to have shorter growth phases (and longer periods of rest). Eventually, they rest forever. Or do they?


So, why do hair follicles stop doing their job?

This is the part where your gender does matter.
The reasons for hair regrowth challenges differ depending on your sex.

Explore the typical causes of hair regrowth problems.

For Women > For Men >