Losing your hair can be very distressful. I have been there. I felt the frustration and the emotional damage that hair loss creates. I tried several products and they were mostly a gimmick; even when they were not, the results were limited.
Then one day I was lucky to find an expert dermatologist who put me in the right path. Today, with his help and my own research and trial and error experience, I don't suffer from hair loss any more. Having said this, at present hair loss is a problem which needs to be managed every day; there is no one-off cure which will resolve the problem and you won't have to do anything about ever again; it's like a chronic illness which you need to manage; but you can manage it successfully. The following are the steps which helped me; they have to be implemented at the same time, though point 2 and 3 are probably the most important:
1 - First of all, do anything that can help you manage or eliminate stress; even if your life is stressful, you need to help your body not be affected by it. Why? Because a number of 'bad' hormones (very simply put) which negatively affect the health of your scalp are stimulated by stress. From a simple chamomile tea to natural supplements, helping your body copy with stress will help in many ways, including your scalp.
2 - Manage excessive scalp grease by using suitable shampoos. If your hair follicles are surrounded by excess grease, they will suffer in varying degrees. As per the right shampoo, read further down.
3 - This page is for hair loss which is the most common for men and women, usually called androgen-related hair loss, simply put, it's when you lose hair caused by the hormone D.H.T. and the way your receptors react to it); therefore, anything that you can do to decrease D.H.T. from your scalp will help tremendously. There are supplements which claim to do that but I found them not too effective myself; moreover, I always prefer a topical solution (applied directly to the scalp) to a topical problem. So I researched products which could effectively remove or decrease D.H.T. in my scalp. This removal is mainly done by a certain ingredient called 'ketoconazole', which has strong anti-fungal properties but has shown to also affect D.H.T. in your scalp. There are very few brands of shampoo containing this product so always read the ingredients. The strength should be 2%. This is only a brief page on this subject; I will go in details and I explain how I use this shampoo (since the way you use it makes a difference).
There are other effective ways which I combine to decrease hair loss.