Judging any gradual-acting supplement fairly takes more discipline than it sounds like. Here's a simple approach.
Before your first capsule, jot down something concrete — how sharp you feel on a 1-10 scale, or a specific recall task you find hard.
Check back at two weeks, four weeks, and eight weeks rather than judging day to day, where normal variability can be mistaken for a trend.
A single good day doesn't confirm anything. A pattern across several weeks, compared honestly to your written baseline, is more meaningful.
A written baseline and a fixed check-in schedule turn "does this work?" from a vague impression into an answer you can actually trust.