What to do to get the best nutritional support?

Healthy diet & supps: I am not sure what you are asking. The foundation of nutritional support is a healthy diet. No one diet is best for everyone but a diet emphasizing a variety of organic fruits, vegetables, beans, nuts, seeds & possibly organic dairy/eggs/meats in moderation is a good foundation (though it can be argued that a vegetarian or vegan diet might be healthiest for many). See comments for further advice.