Rogaine causes hair growth as a result of the drug minoxidil. Although we know that minoxidil works well, researchers are still unsure as to the exact reason why minoxidil can create strands of new hair to grow on areas of the scalp that have been bald for years.
One theory was that minoxidil had an impact on DHT levels better in the blood. If you are unfamiliar with DHT, it is simply a form of testosterone that affects sensitive hair follicles as a person ages. However, it became known that minoxidil had absolutely no effect on DHT levels.
The one characteristic that minoxidil has on the body is that it helps in large blood vessels, commonly referred to as a “vasodilator”. But, again researchers are baffled because it is not proven that hair growth is caused by any vasodilators.