Balding, due to hair loss or alopecia are very common - not only in men, but in women as well. While there are numerous products that 'promise' hair growth, the risks are too high and some might just damage your hair and cause more problems. Instead, doing it the natural way is the most ideal way to deal with it. Here are some ways on how to grow back your hair naturally due to hair loss:
Onion Juice 
No need to make use of harsh chemicals just to promote natural hair growth. Extract juice from onion, and apply thoroughly on scalp. The only disadvantage here is that onion has a pungent smell - but if in return your hair will undergo hair growth, I don't see why not use it?
Eat Foods Rich In Vitamin A
Vitamin A is responsible for creating a shiny, vibrant-looking hair.  It works with the fat synthesis that works through our hair follicles, spurting hair growth.
Honey Hair Tonic
You can make your own hair growth tonic, and it's not difficult to make
* 1 tablespoon honey
* 1 tablespoon dried sage
* 1/2 tablespoon coconut oil
* 10 tablespoons water
Just combine the ingredients, and massage onto scalp for about 3 minutes. Leave on your head for half an hour, rinse and repeat every week.