I just bought some. am desperate after 5 years and willing to try anything taking this plus a million vitamin supplements for 3 weeks and ahve't seen any improvement yet. I don't kow if I am wasting money though because cognitive problems aren't my biggest weakness, it's the sensory problesm that oare the worst, like feeling of swelling in head and spine, diahrea, impotence, brain fog, itching of scalp, niht terrors, etc.