This clinical report presents some of the findings in Thought Field Therapy (TFT) that show both raising and lowering of heart rate variability (HRV). TFT algorithms are effective, but the specificity of diagnosed treatment gives results that are superior to algorithms. Some TFT treatments take only seconds to yield improved results on HRV. Toxins can undo a cured problem and lower HRV. TFT can overturn the effect of some toxins. It is hypothesized that TFT works by inputting a specific code that addresses and effects the healing system. HRV may be a measure of general physical and mental health. © 2001 John Wiley & Sons, Inc. J Clin Psychol 57: 1175–1186, 2001.