Sixty days sounds like a generous return policy, and it is. It is also, whether the seller framed it that way or not, an experiment: one person, one variable, two months. Most people run that experiment so badly that the result tells them nothing, and then they blame the bottle.
You are the worst-placed person to judge
Not because you are foolish, but because you are inside the measurement. You know you started taking something, you paid for it, and you would like it to work. That is enough to shift how you read an ordinary good morning. The placebo response is not a failure of character; it is a well-documented feature of human physiology, and it does not switch off because you are aware of it.
Meanwhile the thing you are trying to observe — concentration, say — swings enormously with sleep, caffeine, stress, illness, how interesting the work is and what time of day it is. Against that much noise, a small consistent effect is genuinely hard to see by feel.
Write something down before you start
Decide, in advance, what you are actually watching. Not "do I feel sharper", which is unfalsifiable, but something with an edge on it. How many times this week did I lose the thread in a meeting. Did I get through the difficult task before lunch or after. How many days did I hit three in the afternoon and need a coffee to continue.
One line a day is enough. The point is not precision; it is having a record written before you knew how the experiment would turn out, because memory quietly edits itself to agree with whatever you believe now.
Change one thing
Starting a supplement, a new sleep schedule and a gym membership in the same week is a common plan and a useless one. Whatever happens, you will not know which of the three did it, and the temptation will be to credit the one you paid the most attention to.
Expect nothing in week one
There is no stimulant in this formula. Nothing in it produces an event you notice within the hour, and anybody who tells you a capsule of amino acids will is describing a different kind of product. If you are looking for a jolt on day two, you have set up the test to fail.
Diminishing patience is not evidence
Around week three the novelty is gone and the honest answer is usually "I am not sure". That uncertainty is the normal midpoint of a small effect observed by one person, not proof of nothing. It is also exactly when most bottles get abandoned, which means most people never reach the point where their own data would have been worth reading.
At the end, be willing to say no
Read your notes. If nothing changed, the correct conclusion is that nothing changed, and the seller gives you sixty days from the date of purchase and accepts empty bottles for exactly that outcome. A refund window used honestly is worth considerably more than one that exists to be ignored.
The terms, including who pays return postage, are on the refund policy page.
