This site’s method, as a tool: one product at a time, four weeks minimum, sleep and caffeine held constant, the verdict written either way. Name what you are trying, rate your day in four taps, and after 28 days see week 1 against week 4 — with your reaction time before and after. Everything stays in this browser.
| Week | Days | Focus | Energy | Mood | Sleep | Hours | Cups |
|---|
Week 1 against week 4 appears here once both weeks have at least three days logged.
This is not medical advice and it does not diagnose anything. It keeps your own ratings; if something feels wrong, stop and talk to your doctor or pharmacist — and never stop a prescribed medicine to run a trial. Your log stays in this browser and is never sent anywhere.
To find out whether a supplement does anything for you, try one at a time for four weeks, keep your sleep and caffeine the same, and rate each day the same way. This tracker does that: four taps a day, then week 1 against week 4 in your own numbers — with the honest caveat that a before-and-after without a placebo cannot rule out expectation.
How to use it
Name the one thing you are trying and the day you start. Each day, at about the same time, tap a rating from 1 (a poor day) to 5 (a great one) for focus, energy, mood and sleep quality, and type last night’s hours of sleep and today’s cups of coffee or other caffeine. A note helps later (“bad night”, “missed a dose”). If you can, take the free Reaction Time Test in the first three days and again from day 22 in the same browser — the tracker puts both runs side by side. After 28 days, print the four weeks or start the next trial. Nothing you type leaves this browser.
The method, and why it is built this way
It is this site’s own: “one product at a time, four weeks minimum, including the times nothing did”, and from the reviews, “four weeks minimum per product, sleep and caffeine held constant, verdict written either way”. One product at a time, because two started together cannot be told apart. Four weeks, because the first week is the baseline and the last week is the comparison. Sleep and caffeine held constant, because both move focus and energy on their own — so the tracker flags a change of more than 1 hour of sleep a night or 1 cup of caffeine a day between week 1 and week 4 (its own rule, not a published one). And the verdict either way: the tracker reports your numbers whether they moved or not.
| Sleep a night | Caffeine a day | Flagged |
|---|---|---|
| 7.5 h → 7 h | 2 → 2 cups | No |
| 7.5 h → 6.25 h | 2 → 2 cups | Sleep |
| 7 h → 7 h | 2 → 3 cups | No |
| 7 h → 7 h | 2 → 3.5 cups | Caffeine |
| 8 h → 6 h | 1 → 3 cups | Sleep and caffeine |
Worked example
- Bacopa, four weeks, 23 days logged: focus averaged 3 in week 1 and 4 in week 4, energy stayed at 3, mood went 3 to 4. But sleep fell from 7.5 to 6 hours a night, so the tracker says sleep was not held constant — and the change may be the sleep’s, not the bacopa’s.
- Reaction time 300 ms on day 2 and 280 ms on day 27: 20 ms faster — and practice alone makes the test faster, which the page says next to it.
Common mistakes
- Starting two things at once. A change cannot be split between them.
- Rating at different times of day. An evening rating and a morning rating are different questions.
- Skipping week 1. Without a baseline, week 4 has nothing to be compared with — the comparison needs three days in each.
- Reading a better week 4 as proof. Expecting something to work can move a self-rating by itself; that is why trials use a placebo, and why this tracker never says a supplement worked.
- Stopping a prescribed medicine to run a trial. Never — talk to your doctor first.
Frequently asked questions
How long should you try a supplement before deciding?
This site’s method is four weeks minimum for one product at a time. Some trials ran longer — the nootropic dose checker lists how long each study lasted — so four weeks is a floor, not a promise that four weeks is enough.
How do I know if a supplement is working?
Measure before and after the same way: rate the same things at the same time each day, keep sleep and caffeine steady, and compare week 1 with week 4. Without a placebo you cannot rule out expectation, so read a change as your own report, not proof.
Where is my log saved?
In this browser only. It is never sent anywhere and never put in the page’s address, so clearing your browsing data deletes it. Print the four weeks if you want a copy.
Why does it ask about sleep and caffeine?
Both change focus and energy on their own. The method holds them constant, and the tracker flags a week-4 change of more than 1 hour of sleep or 1 cup of caffeine a day against week 1.
Can I track two supplements at once?
Not in one trial — the method is one product at a time. Finish the four weeks, start a new trial, and the old one is archived in this browser.
What if I miss days?
Log the days you can. Week 1 against week 4 needs at least three days logged in each; the weekly table shows how many days each week has.
Read next
- Prevagen vs CoQ10 — the method in a full review.
- Mind Lab Pro: a 90-day journey
- Testo Lab Pro: my 75-day experiment
- Lion’s mane: what the newest trials actually found
- The memory and Stroop tests — another before-and-after to save in this browser.
This is not medical advice, and nothing here diagnoses or treats anything. It keeps your own ratings; if something feels wrong, stop and talk to your doctor or pharmacist. Some links on this site are affiliate links: I buy what I review at full price, and a commission never changes a verdict.