Medical science is researching even now at this topic. But there are many other ways also to prevent this. Some time the prevention occur naturally or artificially or even some times super naturally.
but let me tell you some
1)try to find an oil which is suitable to you. (may i tell you an oil :take shoe flower or hibiscus, neem leaves ,curry leaves , mehindi or henna leaves and boil it in coconut oil after washing)
2)use the shampoo which is not allergic to you
3)reduce stress
4)maintain your health
yes you can apply onion juice to your hair to prevent hair loss.
Vitamins A, E and B are supposed to help prevent hair loss in men. Most times hair loss is hereditary and there isn't much that can be done for that except hair plugs.
Coconut oil can help prevent hair loss.
One can prevent hair loss with Biotin by applying Biotin at least twice a day on the section of the scalp or head that one detects is thinning or balding or suffering hair loss.
A wide range of medical conditions can cause female hair loss. Besides treatments for cancer, female hair loss may be due to various autoimmune disorders, such as psoriasis or seborrheic dermatitis. Pregnancy can cause hormonal changes in the body that result in hair loss, as can anemia and thyroid disorders. Polycystic Ovary Syndrome (PCOS), extreme stress or trauma, and menopause may also be the cause of female hair loss.
There are four things that a man can do to prevent or reverse hair loss and they are: diet, stop stressing, limit chemical treatments and use clinical hair growth treatments.
There are many hair creams available that are designed to prevent hair loss. Examples include Ervamatin Hair Lotion, Himalaya Hair Loss Cream, and Trichup Herbal Hair Fall Control Cream. Most hair loss creams, including those listed above, are available through retailers of hair products , such as Amazon Health Care.
Some ways you can prevent hair loss is to take care of your hair, wash your hair regularly with a mild shampoo and control your stress. Also, eat nutritionally and consider taking supplements.
Aminexil is a drug that is used to help hair. It helps prevent hair loss and encourage new hair loss. This is usually used to target hair loss on the head of a person.
the hair
There are no vitamins to prevent hair loss. The product you want is called, "Rogaine", but it is really expensive.
Good nutrition can definitely help prevent some hair loss. You can find a wealth of information at http://www.mayoclinic.com/health/hair-loss/DS00278