Hi, sir; I’m an experienced trainer of nutritional therapy and can guide you on becoming a nutritional therapy practitioner. The primary criteria for becoming a nutritional therapy practitioner is a graduate degree which you already have, and an NTP course certificate offered by the Nutritional Therapy Association. This is a 9-month course that includes theoretical and practical exams along with meetings. Once you complete this course, you can apply for the license, which allows you to work as a nutritional therapy practitioner.