yeah, my short term memory can really go to hell when I am detoxing. I've found that taking 500-1000 mg of tyrosine will make me as sharp as ever and it happens within an hour or two. Tyrosine is a precursor to dopamine and dopamine is a neurotransmitter. However, tyrosine is also a precursor to an thyroid hormone so folks with hyperadrenal issues should avoid. I'm hypothyroid so it helps me. I also do not take it every day but it sure is nice to have just in case I hit the foggy wall.