TRIPHASIC progressive hair loss serum (3 month supply): In progressive hair loss, the hair cycles shorten and the hair capital thins out prematurely. This serum with 3 phases, acts on the three factors of hair loss: Vascular, Hormonal and Tissular to slow down thin looking hair. From the first month, you will see less shedding, and over the next several months, scalp feels stronger and healthier, hair density increases and scalp less visible. To be left on the scalp. 2x/week first month, then 1x/week.