It may SEEM that the 2% would be better, but studies have shown that there is no significant difference between the two. I've also read information that theorizes that another possible way nizoral helps reduce hair thinning is that it reduces inflammation associated with balding. When DHT attaches to receptors at the follicle, it causes an immune reaction in which one's own immune system attacks the follicle (which is the actual cause of hair loss). It was theorized that nizoral reduces the inflammation caused by the immune reaction, therefore reducing the damage done to the follicle.