Does Ortho-molecular medicine help curing Psoriasis?

Unclear question. I do not know what you mean by Ortho-molecular medicine. At this time there is no cure for psoriasis, but there are effective treatments to keep the disease under control. See this site for more info.
Vitamin doctors. These people have been around for decades, offering large doses of various vitamins, making claims that never seem to hold up, and complaining about conspiracies. It's your business if you want to get involved with them, but if you're expecting a cure for psoriasis, you'll be bitterly disappointed. An evidence-based holistic practitioner in your community might be a better choice.