admin 
Have you ever felt that your hair grows faster or slower than others around you? It is believed that the way hair grows varies considerably from person to person.
Hair grows 12 inches a year.
Japanese hair grows approximately 0.3 to 0.4 mm per day. On average, hair grows 1 mm in 3 days, 1 cm in 1 month, and 12 cm in 1 year. Of course, the rate of hair growth is related to individual differences and environmental factors, and according to one theory, the total rate of hair growth can vary up to 10 percent per year. This means that the person who grows the most hair grows about 13 cm per year.
Factors that determine the speed of hair growth
turnover
The surface of the skin has dead skin cells. If this dead skin cells remain on the surface of the skin indefinitely, the skin may appear dull. Therefore, old keratin is peeled off to be replaced by new cells in a cycle called “turnover. Normally, a turnover cycle takes 28 days. However, the number of days increases with age.
As the number of days in the cycle increases, it can be said that the metabolism is declining. The same can be said for hair, which is part of the skin. In other words, if metabolism slows down, the speed of hair growth slows down as well.
proliferating factor
Growth factors are small proteins secreted by cells. There are many different types, and it is not known exactly which growth factors are involved in hair growth.
It is known that growth factors not only have an effect on proliferation, but also suppress it and are involved in cell migration. Also, growth factors seem to play different roles depending on their concentration. If the growth factors can be identified, it is said that a powerful hair-growth agent can be created.
