Here is so many people who are exposed to the same water, pollution, lifestyle, but are growing good hair. Hair loss is due to weakness of hair and is getting hit by trivial unsuspected causes. Not fighting the cause but strengthening the hair, if you treat one cause, hair will fall for another cause. But once the hair is strong, it can stand against any cause. Fighting the causes requires medications, anti-hormones, enzymes blockers with suspected side effects, strengthening the roots can be done with safe low dose vitamins, minerals and nutritional supplements which work to advantage.