Finasteride
"Been taking this medicine since I was 23 and found I had a receding hairline. My hairline has stayed mostly at the same level for the grace of this medicine. No brain fog, no low sex drive. You just need to do exercise and keep a positive attitude. In fact it was exactly what I did and feel like it was the most productive 2 years of my life (I was doing an engineering master). If you worry about the hair give it a shot, and divert the time spent on worrying to something else important. Cheers"