If you are looking for a shampoo to help cover gray hair, then you may want to consider investing in a product that contains keratin. Keratin is a protein that helps keep your hair healthy and voluminous. Additionally, some shampoos that contain keratin can also help reduce the appearance of hair loss. If you’re interested in trying one of these products, be sure to read the reviews first to make sure it’s the right choice for you. Alternatively, you could try using a dye with keratin content to cover gray hair. This option is not as permanent as using a shampoo, but it will provide quick results.