There are many factors that can attribute to hair recession or massive hair fall and you need to find out which one exactly is responsible for the problem you are having now. Of course male pattern baldness is still the most common cause, but, for instance, if you are a woman things are deinitely different! This is the reason why you will need to really dig down and see the source of your problem.
Other causes of hair loss may include (both in men and women): severe mental or emotional stress, excessive use of coloring or bleaching agents, traction alopecia or excessive strain on the scalp due to braiding or corn rowing, hormonal changes, alopecia areata or hair loss due to autoimmune diseases, and many more. Each of these conditions will require a different approach in order to achieve success regardless of whether you're going to be using conventional or natural methods.
In my opinion it's much better to use natural methods as opposed to conventional ones, they're cheaper, have less to no side effects, and often more effective.
A good way of regaining your full head of healthy natural hair is well described on this guide: http://hairagain.toptips.org