Just because you have Gray hair doesn’t mean you should use any old shampoo. When your hair goes Gray it’s a sign that it needs special treatment as the vital nutrients that produce the pigment for your hair color are now no longer as healthy as they use to be.So what should you look for in a shampoo when deciding on the best treatment for your hair? Gray hair will usually be dry so you need a shampoo that will bring back the moisture in your hair as well as replace the vital nutrients that are.