This medication has been so helpful. My father (85 yo) started taking it, and reported feeling much better, so I thought I'd try. I started with 10mg/day, and noticed changes within a week (I am 60). Some chronic rashes vanished, and I started to remember things more easily. After 3 months, I increased to 20 mg/day and have felt very good on that level. I feel less "rattled", and I've stopped feeling overwhelmed all the time. I'm sleeping better, I'm more able to focus, and have more energy. My dad and I regularly talk about how this medication has been so helpful that we don't know why more people don't use it.