Every scalp is different but general statistics do exist about our hair. We resumed them for you.

Knowing your hair and its growth cycle will allow you allow you to take better care of your hair. You should also know that how you should take care of it can change depending on its color.


It is composed by 95% of keratine, which is a fiber protein, and 5% of water. This structure allows the hair to absorb 30% of its own weight in water when healthy. It weighs between 5 and 200 g depending on its length and appearance and between 6,5 and 260 g when wet.


Our hair owes its growth to the hair follicles on our scalp. They number around 1000 per cm² for a newborn and 500 per cm² for an adult between 25 and 55 years old. Each of your hair follicles allow between 5 and 200 hair to grow in a lifetime. 


The average quantity of hair on a scalp amounts around 100 000 and 170 000 depending on your ethnicity and your hair. Its width lies between 0,04 mm and 0,1 mm, which gives a density of 10 to 25 hair per millimeter. Our scalp reaches 600 to 800 cm² with around 200-300 hairt per cm².

The REDACTIV serums increase hair width and its density. They also fasten hair growth to a maximum of 47 more hair per cm².


Each of your hair grows by 1 to 1,5 cm per month, and 18 to 24 cm each year. They stay in the growth phase (anagen phase) for 48 months and can keep living for 5 years as a maximum.

Your hair grow permanently but the opposite is also true : they fall on a daily basis (due to the telogen phase). The balance between these two phenomenona is the reason your hair is what it is, and allows to find out easily when a loss of hair is too strong.  


Each day, you lose an average number of 75 hair. This number shouldn’t reach a hundred, otherwise the loss of hair becomes abnormal. In the hair’s growth cycle, it rests for 8 to 10 days and then take 2 or 3 months to fall as the cells die in the telogen phase. Some medical treatments can induce a transient alopecia : it generally starts after 2 or 3 months of treatment.