Not sure if you can buy it boots .. no harm checking. There website
has a store locator where you can click when you live and there it will show you all the retailers in your area pretty cool.
Yeah I've used it with L-Tyrosine 2500mg I used of the powder ... cheaper than the expensive tablet formulas.
I'm an acrobat and found tyrosine helps improve my concentration and focus pretty well. Yeah I used both viridian and solgars Rhodiola .. Viridian I prefered. One weird thing with Rhodiola is if you ever burp you'll burp the smell of rhodiola pretty much all day But definiately a subtle change using it.
Never used DMAE, pretty pricey too.
Hope that helps.