If we need to use something natural for hair then its oil or aloe Vera because they are very good at reproducing hair.
Aloe vera has most of the things which our hair needs.So its better opt for natural products rather than any pharma product especially for hair.

Natural product according to me,I use olive oil and sometimes coconut oil both are very good for hair according to the weather.
Massage your scalp with it for about 8/10 minutes that will help you in getting thick hair back.

That usually happens because of the lack of nutrition or not giving the food to the hair.Your hair needs a specific food which help them to get healthy and thick.
Massage of hair is also very important people who doesn't do that face hair loss kind of problem.

They really doesn't need a supplement all they need is good care,Eat healthy food like fruits and vegetables.They have almost everything which your hair,skin,nails needs.Pretty much.

You can try why protein if you are training,If not then don not use supplements all your body needs is nutrition which is needed for the body.
Having the correct diet and exercising is the basic thing.