@goldensky - Vertical ridges on your nails are not an indication of a serious nail disease and usually there is no cause for worry.
Besides increasing your level of Vitamin C you need to use a good nail oil that contains both Jojoba oil and Vitamin E oil. I learned this from my dermatologists because like in your situation, my general practitioner didn't seem too concerned.
Our nails are made of several layers and to get rid of the ridges you have to penetrate the deepest layers with the oil.
It's important to use Jojoba oil because it has the power to penetrate through the hardened top layers making it possible for the other essential oils to get all the layers.
You can purchase a good nail oil at your finer nail salons but I've found that a simple Botanical oil from your local beauty supply works just as well.