This article points out problems with unbalanced vegetarian and vegan diets. A balanced one is not that hard to achieve, there are many good resources that give

This article points out problems with unbalanced vegetarian and vegan diets. A balanced one is not that hard to achieve, there are many good resources that give you examples of such varied diets. If well done, supplements are unnecessary apart from vitamin B12. Even B12 doesn't need to be in pills: vegans can get it from marmite/vegemite, and vegetarians from eggs and diary. That being said, it's still advisable to check for deficits, of course.