Difficult to answer. What is the ailment? Tpn is usually a temporary treatment to tide a person over till s/he can recover from a GI illness.
Heal what. Heal you of what? Total parenteral nutrition provides the number of calories, protein, fat and minerals for a healthy life. Will it heal you of cancer- Not for me to say. Please try to be more specific in what it is that you want to heal and what circumstances you are on the TPN for. Best of health.