Minoxidil applied topically (as a solution or foam) induces hair thickening.
Because it contains alcohol, slight skin irritation can occur at the beginning of treatment, which can usually be avoided by using suitable shampoos.
A novel clinical test (sulfotransferase test) has recently been developed, making it possible to assess the degree of individual response to minoxidil in order to select the best minoxidil concentration.
The test consists of removing 3-5 hairs from the scalp and the molecular Minoxidil-sensitive component of the hair root is analyzed. Minoxidil is given orally in form of pills to the chosen candidates.