Don't worry, it is not dangerous at all! The biofeedback is placing a heart rate monitor on you and breathing in sync with the program. This helps you to control your heart rate variability. You are also hooked up to measure your muscle tension and skin temperature. There are no side-effects, and to me, taking medications is more dangerous. In fact, the biofeedback has helped me way more than any drug has. The doctor there is also extremely helpful and nice, she would never try to take advantage of you. It is definitely NOT a scam. I did the 10-day program there last summer, and ever since then, I've had way better control of my heart rate, circulation, and temperature. I'm not cured, but it was still worth it.