I agree with Feo. Nutritional balancing is turning my health around. It's important to work with a trained practitioner because they can accurately read hair tests. When toxicity doesn't show up on the first test, it often is because toxins are stored deep within the body organs. The ratios of minerals tell the practitioner a lot.
Dr. Larry Wilson, www.drlwilson.com, is an expert on this, and NB healed him. Check out his site. Any practitioner he trains has to have been on the program himself or herself. The one I work with was very ill from his youth up. His health is outstanding now.