Mostly every compound has a natural background behind it, unfortunately most of the natural stuff that you could try are very weak, or you would need big amounts of it, that's why drugs were invented, they are potent and have the ability to achieve almost instantly what a natural treatment would maybe in a couple of months, years, depending on the situation and a lot of other factors of course. It's complicated, i am strong believer that the underlying cause of hairloss starts at a very young age because of a multitude of factors that trigger this cascade of events that it's so hard to stop even with the most powerful drugs out there...
People tried everything and they are still doing it and depending on a lot of factors, there were and are individuals that had and have success with different natural treatments, from castor oils to natura dht blockers and so on... You have to take care of yourself, something is wrong when hair falls and our bodies react to it and even in the most part genetics plays a huge role, other things that we don't fully understand yet, play a big role also, from diet, exercise, our reaction to stress and how the pituitary gland works and responds to different hormones, plus many other factors.
It's more complicated than most people like to think and until science really finds out more about this condition, we are stuck with this cascade of contradictory information that makes you feel that nobody actually knows sh*t about it...