Yes it is, but you should work out a regime with it, because if you have a serious hormone problem (like insulin) then you will have trouble getting results from using any single method of hair growth, including those pharmaceutical drugs.
Basics are, taoist soap, scalp massage, take beef based collagen, and eat stinging nettle supplements as well as b-complex supplements daily. This will help, and helped me see the fasted results with thick hair within 2-3 months of daily use (works faster if you workout cardio 2-3 times a day, but i never have time).
Just what @abid said, very accurate and hundreds of people have seen benefits. Even if the hair loss is caused by DHT, or other reasons (other than radiation at least), you can thicken hair, and regrow hair-line parts too.