Scientists from the UpJohn corporation have conducted several clinical studies of a dermal solution of Minoxidil at 2% and 5% concentrations to determine its effectiveness against hair loss and its ability to induce growth of new hair. Clinical tests of the effectiveness of the dermal solution of Minoxidil in men (with baldness on top of the head) showed that in 48% of subjects, hair loss stopped after a year of using Minoxidil and that hair growth was restored. In 36% of men, there was a partial improvement in hair growth. In 16% of men, no hair regrowth was observed.
After the use of Minoxidil at a 5% concentration, the rate of new hair growth was 45% higher than it was at a 2% concentration. (The parameter that was compared was the number of hairs on top of the head with a diameter of 1,0cm.) In 54% of patients, a restoration of hair growth was observed in this area when it was treated with Minoxidil at a 5% concentration. Similar results were observed in clinical tests for women. After one year of treatment, the average number of hairs in the observed area increased by 112 hairs.