Hair analysis evaluation to determine metabolism type, mineral and vitamin balances and ratios to determine to determine foods to avoid and foods to increase in the diet. Hair analysis affords the patient a tool to re assess progress and usefulness of diet plan. A hair sample is taken by the doctor and sent out to a lab for results. Nutritional physiology takes place at the cellular level. What you eat is not as important as what is reaching your body on a cellular level. Hair analysis is a method to utilize to determine directly about the main site of nutritional metabolism.