Ask someone whether a supplement worked and they will consult a mood, not a record. That mood is contaminated by sleep last night, work that week, and the sunk cost of what they paid.
Two well-documented biases run in opposite directions here: expectation makes people report improvement that testing does not confirm, and scepticism makes people dismiss changes that did occur. Neither is resolved by thinking harder.
A good marker is specific, countable and collected the same way each time. A bad marker is “how I feel”.
Log your markers for one week before your first serving. Without a baseline, week eight is being compared against a memory, and memory is exactly what you were trying to avoid relying on.
This single step is what separates a real personal trial from a guess. It costs one week and it makes the other twelve meaningful.
If you start a supplement, a new training block and a new diet in the same week, you will learn nothing about any of them. Whatever happens, you will not know why.
Give a new supplement a clean run against a stable routine. It is less exciting and vastly more informative.
Put week eight in your calendar on day one, and commit to not evaluating before it. This protects against both the week-two “nothing is happening” abandonment and the week-one placebo enthusiasm.
It also aligns your assessment with the window the ingredients were actually studied over.
“My 3pm energy averaged 4.2 in the baseline week and 6.1 in week eight, with training sessions up from two to three per week” is a conclusion. “I think maybe it helped a bit” is not.
The second one is what most supplement reviews are built from, which is worth remembering next time you read one — including on this site.

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