I am looking for advice on the quickest way to pack on some real lean mass over the next few months. I have been lifting naturally for years and here are my stats:

Age: 30
Height: 6'1
Weight: 172
Fat%: 8

I am currently taking Dutasteride and small amounts of Arimidex to battle hair loss and keep trim.

I lift to look good, so I don't want that hair to go.

What's the right stuff to take to pack on the muscle and spare the hair? HGH?