It's my opinion that Anabolic steroids can cause hair loss in people who are susceptible to it, even transplanted hair may be lost. They raise dihydrotestosterone levels which is one of the main causes of male hair loss. I would think to counter the increase and the effects it causes you would require a counter measure with Finasteride to lower the dihydrotestosterone. My namesake was rumored to be a big user of Anabolic steroids but has retained a full head of hair.
Yes Arnie has a full head of hair to this day. I was hoping to avoid Finasteride with its DHT reducing capabilities, but I may have to give it a shot with a reduced dosage of half milligram daily. Are you training by any chance?