I have had brain fog /die off (also known as Heximer's reaction) when I have cleansed and toxins are released. I have had success taking an amino acid combination: L-Arginine/L. Ornithine. I read that they absorb the toxins and I have relief from the brain fog within 1/2 hour. I take one capsule, 1000 mg on an empty stomach. Also, I have had good results with a molybdenum 120 mcg & Glutathione 50 mg complex, sublingual tablet. However, I use the amino acid combo more often, because it is easier to find online or in my local health food store.