Hair: how does it grow?

He seems so thin and fragile. And yet, human hair hides many secrets. And just the fact that an individual wears an average of 100, 000 hair on his head deserves a closer look at this part of our body whose function far exceeds the aesthetic aspect!

Our hair is mainly made of keratin fibers. Each hair consists of 3 layers:

  • The cuticle, the outer sheath of the hair, is composed of several layers of keratin scales.
    Well closed and adherent to each other, these scales give the hair its silky appearance; Assaulted, damaged by inappropriate hair care, the cuticles break and the hair becomes dull, forked.
  • The cortex, located under the cuticle, is a kind of protein fiber bark.
    It ensures the elasticity, vigor but also the color of the hair because it contains the pigments.
  • The marrow, the central part of the hair, is connected to the bulb.
    She is responsible for providing the necessary elements for the cuticle and the cortex.

Hair life cycle

The life cycle of the hair consists of 3 phases:

  • The growth phase (anagen) lasts 2 to 7 years, and concerns 85% of the hair.
  • The involution phase (catagen) lasts 2 to 3 weeks and concerns 1% of the hair.
  • The fall phase (telogen) lasts a few months and affects 14% of the hair.

Each hair being at a different stage, it is normal to lose 30, 50 or more each day.

Hair growth

A hair grows on average 1 to 1.5 cm per month. Growth is not homogeneous over the entire surface of the skull.

Contrary to popular belief, cutting a hair short does not accelerate its growth, because it is only through the root that it grows.

How to act on hair growth?

  • A healthy and balanced diet is essential: Consume amino acids found in meat and fish to contribute to the development of keratin.
  • A course of food supplements can sometimes be recommended to boost the growth of new hair; these supplements must contain sulfur amino acids (main component of keratin), zinc, vitamin B6.
  • Finally, it is advisable to regularly massage the scalp: they stimulate the blood circulation, promote the elimination of dead cells and the breakthrough of the new hair.

But, hair growth, like hair loss, is partly determined by hormonal and genetic factors.

You want to react, to give your testimony or to ask a question? See you in our FORUMS Hair Loss, Hair Care or A doctor answers you!

Read also :

> Hair loss: causes and treatments
> Hair loss in women
> Trichotillomania: this mania to tear off the hair
> Oily hair: causes and treatments

Popular Posts

Category Beauty, Next Article

Cancer: tips to stay beautiful: Practical advice - Beauty

Cancer: tips to stay beautiful: Practical advice

Here are some tips for putting on makeup and erasing the effects of the disease and treatments. Redraw an eyebrow We must start by choosing a product specially designed for eyebrows, pencil or makeup: it all depends on what we are most comfortable with. The choice of color is essential: brown as black do not give a natural effect
Read More
Avoid the failures of cosmetic surgery - Beauty

Avoid the failures of cosmetic surgery

Sometimes we meet them on the street. They are often seen on television, showing the effects of their failed plastic surgery on camera. This can affect any part of the operated body: the face, the belly, the arms, the buttocks, the breasts. Some stories have something to frighten ... Then before you throw under the knife of the first miracle worker, before attempting - your turn - to reverse the race of time needles: inform you
Read More
Sun and skin: which sun protection is effective? - Beauty

Sun and skin: which sun protection is effective?

We must be reasonable in terms of sun exposure, and good habits are taken from childhood. So: protect us, and protect our children! Sun protection: is it effective? Are solar products ( sunscreens & co) really effective? And how effective are they in skin cancer and skin aging? One thing is certain: sun products avoid sunburn, even during long exposures
Read More
Perspiration - Beauty


Sweating, we would do well! Whether under the armpits, on the forehead or between the toes, it can sometimes be truly disabling. Some tips and information to better understand the phenomenon of sweating ... and better control. What is transpiration? In adulthood, each human eliminates between 0.5 and 1 liter of perspiration per day
Read More