I've been taking testosterone booster and started losing hair.

I suggest a formal consultation to determine what is best.  This requires assessment to determine the best treatments.  Best, Dr. Emer.

mazztm,Sounds like the testosterone booster is working. An increase in serum testosterone will likely trigger increase hair loss in the genetically predispose individual. It takes two things: 1. genetically inherited pattern of hair with sensitive to DHT; 2. Testosterone or more accurately DHT it's metabolite. The interaction of the two leads to shortening of the anagen growth phase of hair. Hence the hair grow less and less until they are so thin and without pigment becoming  less visible.Sincerely,Bernardino A. Arocha, MD

Hair loss from testosterone is well documented. With the combination of HGH and testosterone, you will continue to lose hair until your balding pattern is reached. This hair loss will not return.