How To Improve Facial Hair Growth?

i am 21 yrs old but dont have facial growth, i did all the test like teststerone , semin analysis, and like php etc all were normal , neither it is heridity, dr. suggested sustanon 250 ever 10th day and minoxi to apply on face daily.my testosterone level was 410. while another endocrinologist strictly said no to sustanon and minoxi as it can create problem in fertilization in future and other side effects for that , So what should i do , i am a pilot , i have to undergo many medical test every 6months. What should i do so that i can increase facial growth without any medical problems. Currently i am taking dietry precautions to inc. testosterone level naturally, like having more zinc and vitamin on diet and also omega3.