Start with what a habit runs on

The research on everyday habits keeps arriving at the same structural point: a habit is a behaviour that has become attached to a cue, not to a goal or to enthusiasm. Something in the environment, or something else you were already doing, reliably comes first, and the behaviour follows without much deliberation.

The cleanest demonstration of this is an old and slightly sad study. Wood, Tam and Witt followed university students who transferred to a new campus, and looked at what happened to three of their established habits: exercising, reading the newspaper, and watching television. The finding was that those habits survived the move only when the relevant parts of the performance context stayed the same. When the context changed, the behaviour dropped back under deliberate control, which is to say it became something you have to decide to do again.

What makes the study useful is a detail that is easy to skim past. The researchers checked whether the students had simply stopped wanting to do these things, and concluded that changes in intentions alone could not explain the disruption. People had not lost motivation. They had lost their cues.

That is worth knowing if you have ever moved house, changed jobs, had a baby, or had a partner move in, and found that a routine you thought was locked in quietly evaporated. Nothing was wrong with you. The furniture moved.

(A note on this study: it is longitudinal and quasi-experimental, which means the researchers did not assign anyone to transfer universities; they followed people who were transferring anyway. It also relies on self-reported behaviour. The sample size was not available in the record we could retrieve, so we are not stating one.)

The gap in the middle of this topic

Here is where we have to be straight with you, because the internet mostly will not be.

We could not find a single study that tests whether putting a supplement somewhere visible changes whether people take it. Not one. We searched the peer-reviewed literature specifically for it. That is the literal premise of this article, and there is no direct evidence for it.

What exists instead is a body of research on food placement, and its direction is the opposite of what you would want. A 2019 Cochrane review by Hollands and colleagues looked at what happens when you alter how available or how close a product is. Across 15 comparisons from 12 studies covering 1,098 people, putting a food farther away moderately reduced how much of it people ate, a standardised effect of about −0.60.

Read that carefully. It shows that moving something away reduces consumption of it. It does not show that moving something toward you increases a behaviour you want. Those are different claims, and turning the first into the second means flipping the direction, changing the product category, and changing the outcome measure, which is three leaps stacked on top of each other.

And the review's own authors rated the certainty of that evidence as low, dropping to very low for the effect on selection, which rested on a single study of 41 people. Twenty of the 24 included studies raised concerns about risk of bias. Most tellingly, when the reviewers looked at what predicted a bigger effect, they found the effect was larger in the studies at higher risk of bias, the classic fingerprint of a result that is partly an artefact of weak methods.

So the idea that visibility helps is a reasonable hypothesis that fits everything we know about cue-dependence. It is not a demonstrated effect, and anyone who tells you "studies show that keeping it on the counter makes you take it" is telling you something nobody has measured.

What the evidence does support

Two things, fairly clearly.

First: the cue needs to be stable. A 2026 preregistered reanalysis by Bürgler and colleagues, following 254 people with monthly surveys over six months, identified six factors significantly associated with habit strength: autonomous motivation, how often the behaviour happened, context stability, feeling energised, feeling pleased, and perceived difficulty (this last one working against habit strength). Context stability is the one that matters for our purposes. A spot that is the same every day is doing real work.

Second: repetition is what moves the needle. A randomised trial by Keller and colleagues in 2021 put 192 adults, aged 18 to 77, into two groups. One group linked a new everyday nutrition behaviour to an existing daily routine; the other linked it to a specific clock time. Daily questionnaires for 84 days. The result was that both approaches worked and neither beat the other. What predicted automaticity was simply how repeatedly people carried out their plan.

That is oddly freeing. It means the question "should I anchor this to breakfast or to 8 a.m.?" has a research answer, and the answer is whichever one you'll do. The cue type is not the lever; the repetition is.

One result that deserves to be in this article, even though it is inconvenient

In 2000, Huang and colleagues published an analysis drawn from two randomised vitamin supplementation trials. In the first, 184 participants were randomised to receive a pill organiser or not. The pill count distribution was similar in both groups: the organiser did not improve how many pills people took.

In the second trial, 297 participants received either blister packs or pill organisers. Among the people who were already adhering poorly, the blister-pack group did better on pill counts. But the authors' summary of the whole thing is worth carrying away: neither pill delivery system improved adherence as measured by serum vitamin levels.

That is a rare and valuable study, because it measured the thing people usually skip. Pill counts went up, in one subgroup, and the blood levels did not follow.

We are including it on purpose. If we told you that setting up your counter is a proven way to get more out of a supplement, we would be making a claim this study argues against. What a good setup can reasonably do is make the behaviour more likely to recur. That is worth something on its own (a product you never open does nothing for anyone), but it is a claim about behaviour, not a claim about physiology, and we are not going to blur the two.

So where should it go?

Given all that, here is how to think about the decision. Treat this as sensible practice rather than as research findings, because that is what it is.

Pick the place where you already stop. Not the place that seems tidiest. Habits attach to things that already happen reliably: the kettle, the coffee machine, the dog's bowl, the spot where you set your keys down. If your morning has an unmovable fixed point, that is your candidate. If your mornings are really chaotic, look at your evening instead; the anchor does not have to be in the morning just because supplements are traditionally a morning thing.

Pick one place and leave it there. The transfer-student finding is the one to keep in mind. A cue that moves is not a cue. Two bottles in two rooms, or a bottle that lives in whichever bag you carried yesterday, is a setup with no stable context at all.

Keep the visual simple. If four things are in the same spot and you take two of them, you are making a small decision every morning instead of running a routine. Either everything in that spot gets taken, or the spot is wrong. (If you take several different things, the next article in this set is about organising that specifically.)

Mind the tension between "visible" and "well-stored." This is the real complication with counter placement, and it deserves honesty rather than a rule.

The research on what happens to tablets outside their original packaging is about prescription medicines, not dietary supplements, and there is no study we could find of supplements in a household container. What those studies do show is that conditions matter, that the effect varies a lot by product, and that the practical consequence is often small. A UK study repackaged three medicines together into two commercially available organizers for eight weeks and reached a carefully two-sided conclusion: organizers do not give the same protection as the manufacturer's packaging, and dissolution performance differed, but overall product performance stayed within pharmacopoeial specification. An Australian laboratory study held every available brand of a single drug at 30°C and 75% relative humidity for 28 days (deliberately stressed tropical conditions, not a kitchen): one brand held up fine, and several were judged unsuitable for repackaging because of physical instability, which the authors attributed to differences in the inactive ingredients rather than the active one. A French hospital study held tablets under five different storage conditions for 84 days and found the drug content perfectly stable throughout, but appearance changed in the tablets kept under UV light, and hardness declined across the board.

None of that is about your kitchen. What it supports is a piece of reasoning, clearly labelled as reasoning: warm, humid and bright are the three conditions those studies were probing, and a sunny windowsill, the shelf above the stove, and a steamy bathroom are all warm, humid or bright. A cool, dry, shaded spot that you still walk past every day is the thing to aim for: inside a cupboard door you open daily, on a shelf in the pantry at eye level, or next to the coffee but not next to the kettle's steam.

And put it where a child cannot reach it, full stop. This one is not a preference. Federal packaging rules require child-resistant packaging for dietary supplements containing 250 milligrams or more of elemental iron from any source in a single package (the threshold is written per package, not per tablet). But plenty of products that are hazardous to a small child fall outside that rule, and the pediatric data is sobering: a national surveillance study across 63 emergency departments estimated roughly 23,005 emergency department visits a year in the United States for supplement-related adverse events, with unsupervised children accounting for 21.2% of them. A visible spot and a reachable spot are not the same thing, and when they conflict, reachability loses.

The part that is within your control

Strip away everything uncertain here and a short list remains.

You cannot make a habit form faster by wanting it more. You can give it a cue that does not move. You cannot make placement do the work of repetition: the trial that tested cue type found it did not matter, and the trial that tested pill organisers found they did not change blood levels. What placement can plausibly do is remove the small daily act of remembering. Whether that is the main reason routines fail is not something we found evidence on either way, but it is cheap to remove, and the cue-dependence research says a stable context is doing real work.

Set it up once, in a spot that is cool, dry, out of a child's reach, and directly in the path of something you already do without thinking. Then stop optimising it. The next two articles in this set deal with what to attach it to, and what to do when the week falls apart anyway.

This article is for general education. It is not medical advice, and nothing here is intended to diagnose, treat, cure or prevent any disease. If you take prescription medicines, are pregnant or breastfeeding, or have a medical condition, talk with your doctor or pharmacist about any supplement before you start it.