At this moment in time there is no known cure for hair loss. If your hair loss has been caused by shock, or illness, or medication – then it may be that as your body recuperates and returns to normal that your hair cycle may well recover – but there is no guarantee.
There are many vitamin supplements on the market that claim to help your hair to re-grow – but again the science behind these is still questionable/in the early stages.
Is there anything one can do to promote hair growth?
Yes. There are a number of things that can be done to promote a healthier scalp resulting in more hair growth, but this will not stop or reverse hair loss. By looking after your intake of vitamins and minerals and taking care of your scalp one can slow down the balding or thinning process. Protein is necessary for healthy hair growth as keratin which makes up the hair is essentially made up of protein; so diets that avoid protein should not be practiced.
In general a healthy, balanced diet with moderate exercise and avoidance of excessive sweat, dirt, chemicals and dandruff should help.