I started the Nutrition Response Testing because of multiple food allergies and migraines. I was started on a few supplements and within 3-4 days I noticed a complete change in my digestive system, it was amazing! I ended up running out of the supplements for a couple weeks due to moving and having a busy schedule, and within a couple days I was right back to being bloated and constipated. It was proof to me that the supplements made a huge difference in the way I feel and overall health.