One of our web visitors named Edwin from Chicago Illinois sent in the following question. Will drinking carrot juice cure or prevent gray hair? The answer is no, drinking carrot juice will not cure or prevent grey hair from forming. Once you loose pigment in a hair strand, unfortunately the condition is permanent. Although it has been scientifically proven that extreme malnutrition and stress can trigger an earlier occurrence of grey hair, there is no normal lifestyle change you can make that will prevent it from occurring. I'm not sure how the myth got started with regard to carrot juice, however it is absolutely untrue. Raw homemade carrot juice does contain a lot of vitamin A which is essential for strong and healthy hair, it also helps your body maintain pigmentation in both your skin and hair. I'm sorry to have to deliver the bad news, I have grey hair as well, and am eagerly awaiting a permanent cure too.