How long to give a product before deciding it does nothing

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Researched. We have not used this one long enough to give you a verdict, and we would rather say so than invent one. What follows is how it works, who it suits, and what it will not do. When we have used it properly, this page carries the verdict and the date.

Differin Gel (adapalene 0.1%)

Most products are thrown out on the wrong schedule. Some are abandoned three weeks before they would have shown anything. Others are kept for a year on the strength of one good fortnight that had nothing to do with them.

The number varies enormously by category, and knowing which number applies to the thing in your hand is most of the skill.

The clock belongs to the skin, not to the product

The outer layer of skin replaces itself on a cycle — roughly a month in a young adult, slower with age.

Anything working on that layer is therefore waiting on that cycle. It cannot show you a result on skin that had already reached the surface before you started. It can only show you a result on skin that arrived while you were using it.

That is why almost every honest timescale in skincare starts at four weeks. It is not a marketing convention or a hedge. It is the cycle.

The timescales worth writing down

Cleanser — days. Judge it immediately, on how your face feels ten minutes after you have used it. Tight, squeaky, stinging: wrong cleanser, no waiting required.

Moisturizer — about a week. Comfort is the entire job, and comfort is immediate. A moisturizer that has not made your skin more comfortable within a week is not going to become the right moisturizer in month three.

Sunscreen — never. You cannot evaluate a sunscreen by looking at your face. There is no visible outcome; the absence of an outcome is the outcome. Judge it on whether you will wear it daily, because that is the only variable in it you control.

Exfoliating acid — four to eight weeks. Congestion and texture move on skin's schedule, and what a BHA actually does it does slowly.

Retinoid — twelve weeks, and expect the early weeks to be worse.

Pigment — eight to twelve weeks at minimum, and only alongside daily sunscreen. This is the slowest category there is, which is also why it is the one most heavily sold with before-and-after photographs. Kojic acid and the rest of the brightening shelf are working on months.

A hydrocolloid patch — overnight. Some things genuinely are fast, and it is worth keeping one fast thing in mind so the slow numbers do not start to feel like an excuse. A patch either drew something by morning or it did not.

The part in the middle where it gets worse

Some categories legitimately get worse before they get better. Retinoids are the famous case, and the period is real.

It is also perfect cover for a product that simply does not agree with you, which is why it is worth being able to tell the two apart.

Adjustment looks like dryness, flaking and tightness, appearing a day or two after application, spread across the areas you applied it. It eases over a few weeks.

Irritation stings while you are applying it, or within minutes of it. It can bring heat, redness that spreads past where you put it, and a raw feeling when water touches your face. It does not ease. It accumulates.

If it hurts as it goes on, that is not adjustment. Persistence does not convert one into the other, and the fortnight of recovery you will need afterwards costs more than the weeks you were trying to save.

Why you are a poor judge of your own face

You look at it every day, which is close to the worst possible sampling interval for a change that takes eight weeks. And you have no baseline, because your memory of your skin in April is not a photograph.

So take a photograph. The same spot in the room, the same time of day, no filter, and artificial light rather than daylight if you want it repeatable — daylight in November is not the light you had in June. Once a fortnight is plenty. It is not for anybody else.

The confounds, briefly

• Starting three things at once. Then you have learnt nothing about any of them and cannot even work out what to keep. This is the most common way to waste twelve weeks.
• The season. A routine that stopped working in October may just be October.
• Ordinary variation. Skin has good and bad weeks for reasons that have nothing to do with anything on the shelf. A conclusion drawn from one week is a conclusion about that week.

The rare product that prints its own timeline

In 2016 the FDA granted adapalene 0.1% over-the-counter status; it had been prescription-only until then. A product like that is regulated as a drug, and the consequence is that its labelling is not a marketing decision. The wording, the warnings and the timeline are fixed by that status.

Which is why the box marketed for acne tells you to allow up to twelve weeks and warns you that skin may look worse in the early weeks — an unusually unflattering thing for a package to say, and it is on there because the rules require the honest version rather than because someone in marketing was brave.

The cosmetic sitting beside it on the shelf is under no such obligation. It can tell you about seven days, because nothing compels it to mention week nine.

That contrast is the useful thing to carry around. When a package quotes you a fast number, ask what category of product it is and what it was permitted to say.

What adapalene will not do

• It will not work faster at a higher frequency. Every other night for twelve weeks beats every night for three, because every night for three is how the fortnight off starts.
• It will not shift the brown marks left by old spots on the timescale you are hoping for. That is pigment, and pigment is the eight-to-twelve-week row above.
• It will not be the right tool for a deep, cyclical, jawline-shaped pattern. Twelve weeks will tell you that expensively; a prescriber will tell you sooner.
• It is not one to start if you are pregnant or trying to be. The box says ask a doctor, and it says it for a reason.

The twelve weeks are a maximum for deciding it does nothing, not a sentence you must serve. Stop sooner if:

• It stings every time you use it.
• You dread it, so you skip it, so it is not being trialled in any meaningful sense anyway.
• It pills under everything, and you are rubbing half of it off before it does anything.
• The problem you bought it for was never in its remit. Twelve weeks will not fix a mismatch of tool to job, and most disappointment in skincare is a mismatch of tool to job wearing a costume.

The one thing that decides whether the twelve weeks are worth anything

Changing nothing else during them.

A trial with three variables in it is not a trial. It is just a season of your life with some bottles in it.

The product

It is the product this article's longest number belongs to, and one of the few whose own packaging states the timeline instead of selling you a faster one. That honesty is a consequence of its drug status rather than a choice, which is exactly why it is worth reading.

The one people are searching for is the Differin Gel (adapalene 0.1%).

Differin Gel (adapalene 0.1%)

We do not print prices here, because a price we typed last month is a price that is wrong today.

Written by JamieG in Garner Town, Tennessee.