Thryever won't show you a correlation card on day 3, even if the pattern already looks obvious. That's a deliberate constraint, not a limitation we're apologizing for. Here's the reasoning.
A correlation needs something to compare against. If you took magnesium every single day for two weeks, there's no "off" day to compare your sleep against. You'd just be looking at two weeks of sleep scores with nothing to attribute them to. The 14-day window exists to give a realistic chance of both taken and skipped days showing up naturally, so there's an actual contrast to measure.
If you're that consistent (which is genuinely good, from a habit standpoint), the app will tell you so directly rather than fabricate a comparison, and it'll suggest an alternative: run a short, deliberate pause on one supplement to generate the contrast a correlation needs.
Every correlation is written as an observation about your own data, not a claim about cause and effect:
"Sleep scores were higher on days magnesium was logged as taken."
not
"Magnesium improved your sleep."
That distinction isn't a legal formality dressed up as caution. Self-reported daily check-ins can't rule out everything else that changed in your life during those two weeks: a stressful week at work, a different bedtime, a cold. A correlation over 14 self-reported days is a genuinely useful pattern in your own data. It is not a controlled experiment, and it shouldn't be presented as one.
Every correlation card shows how many days it's built from and a rough strength label (low, moderate, notable) based on both the sample size and the size of the difference. A pattern from 6 comparable days and a pattern from 20 are not the same kind of evidence, and the app doesn't blur that distinction to make an early result look more confident than it is.