How long does it take to grow the hair?
The growth cycle of the Hair has three phases: anagen or growth, catagen (transition between anagen and telogen) and telogen or resting. The length of the hair is proportional to the duration of the growth phase (which lasts between two and six years) . The longer this phase lasts, the more hair grows and “this depends on genetic, nutritional, hormonal and metabolic factors “, explains Javier Olalquiaga, head of the Dermatology service of the Cemtro Clinic in Madrid. The speed and duration of the growth phase can vary according to age.
Elena Roche, specialist of the Capillary Medicine Unit of Hospital Chiron in Valencia , specifies that hair grows according to the level of blood flow, trace elements, amino acids and vitamins.
How much does it grow per day, month and year?
According to her , hair grows about 0.4 millimeters a day, one centimeter a month and about 15 centimeters a year . In addition, “usually grows faster in adult women than in adult men, and with aging the rate of growth decreases,” says Olalquiaga.
The growth is not homogeneous , since in a certain area of the scalp there will always be a percentage of hairs in each of the phases of the cycle.
“On the scalp and, in the absence of pathology, there are approximately 85 percent hairs in the anagen phase, 14 percent in catagen and 1 percent in catagen.” Thus, for example, the hair grows faster on the crown of the head than in the temporal regions .
Olalquiaga points out situations in which the proportion of hair in the resting phase increases:
• Thyroid diseases
• Iron deficiency
• Febrile episodes
• After delivery
Can you make it grow faster?
Roche reveals that the growth phase can be prolonged through the use of minoxidil . Blocks the action of a metabolite of testosterone at the level of the scalp, so that it reverses the miniaturization of the follicles (process that causes baldness).
It denies that the greater or lesser care of the external hair influences the growth of the hair bulb. And Olalquiaga explains: “the growth takes place several millimeters deep”. Roche rules out that cutting or shaving the hair makes it grow healthier and stronger.
On the other hand, it grows slower when there are nutritional deficiencies or metabolic diseases.
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