Hello Lybrate-user!
usually, dandruff treating drugs does not alter hair color. Stress is one of the reasons for grey hairs, but other factors like vitamin b12 deficiency, low ferritin levels ,micronutrient deficiency, hereditary etc also play a role. Follihair is good tablet containing all micronutrients, iron, calcium ,folic acid, biotin etc which helps you to prevent from further greying of hairs but cannot reverse greying of hairs. Please go for necessary investigations and find out the cause and get corrected accordingly.