Is this in my head or is it the difference between UGL and prescription.

I have purchased through two separate UGL Labs here both of which have provided great service and product. When I take my UGL lab test C 250mg I feel no where as good as i do with 200mg/ML prescription test C. Same feeling when taking higher doses... i feel better on prescription vs UGL. is this all in my head.

sometimes I'm a little anxious about the fact that with UGL i don't really know what I'm getting.

thoughts?