A Nutritionist is trained in nutritional medicine alone to correct health challenges; & a herbalist uses herbal medicine alone to correct health issues. A Naturopath is trained in both nutritional medicine and herbal medicine & often utilises a number of different techniques to assist you in working with your health issues. Always check the qualifications of your practitioner to ensure they are a degree trained AND belong to an Australian governing body in their field. There are a number of short courses available which hold little to zero scientific background and clinical experience.