Got brain fog? That's one of the most common signs of a leaky blood brain barrier. Reduced brain function (cognitive decline) is also a common sign. The GABA Challenge, as discussed by Dr. Datis Kharrazian in his book "Why Isn't My Brain Working?", provides us with a simple tool to assess the … [Read more...] about The GABA Challenge: Do you have a Leaky Blood Brain Barrier?