Most of us have one: a drawer or a basket of half-used serums, each bought because a video made it look like the answer. Some of them are good products. The problem is that nobody told us which step they fill, what they can be used with, or whether they are still any good. Before you buy anything else, it is worth taking everything out and sorting it. You probably already own most of a solid routine. This is the order I would go in.
Pull everything out and group it
Take every product out of the drawer, the bathroom cabinet and your travel bag, and put it all on a towel. Seeing it in one place is usually the moment it clicks. Then group what you have by what it does: cleansers, serums, moisturizers, sunscreens, exfoliants, masks, and a pile for things you are not sure about.
If you can't tell what a product is for, the label usually tells you. Look at the first five ingredients and any active named on the front, such as vitamin C, retinol, glycolic acid or niacinamide. My guide to active ingredients explains what each one does.
Toss anything that has turned
Skincare does not last forever, and some actives lose their strength well before they look bad. Three things tell you when to let a product go.
The open jar symbol. On the back of most products is a small drawing of an open jar with a number inside, like 6M or 12M. That is how many months the product is meant to last after you open it. If you can't remember when you opened it and it has been more than a year, I would replace it.
An expiration date. Sunscreen in the US carries one, because the sun filters break down over time. Expired sunscreen may not give you the protection on the label, so it goes first.
A change in color, smell or texture. A product that has separated, gone lumpy, or started to smell different is past its best. Vitamin C is the most common one to turn: an L-ascorbic acid serum that has gone dark orange or brown has lost much of its strength.
L-ascorbic acid reacts with air and light and breaks down into compounds that do not work the same way on skin. The serum darkens as it does. A pale yellow is usually fine. Dark orange or brown means it is time to replace it, and keeping the cap tight and the bottle out of the light helps a new one last longer.
Pick one of each essential
Now look for the five products that do most of the work in any routine after 40. Pick one of each from what you already own:
If you have two of the same thing, use the one you opened first until it is gone, then move to the next. If you are missing one, that is the only thing worth buying right now. For a lot of us, the missing piece is a retinoid or a sunscreen they like enough to wear every day.
These five go in your daily spot, where you can see them. My morning routine and evening routine walk through the order.
Give the leftovers a job, or let them go
Everything else is either an extra that earns a spot, or something you can pass along. Here is how I would sort the most common leftovers.
Glycolic, lactic, mandelic or salicylic acid. Keep one, and use it once a week to start, never on a retinoid night.
A good fit for the nights you skip your retinoid. They are gentle and work well with almost everything.
Tranexamic acid for spots, azelaic acid for redness, growth factors or peptides for lines. Keep the one for your main concern, and use it in the morning after vitamin C.
Hyaluronic acid, ceramide or cica serums. Use them after cleansing and before moisturizer, especially in dry weather.
A once-a-week extra, or the night before an event. Keep them in a basket, not in your daily lineup.
If it stung every time, your skin is telling you something. Pass it to a friend whose skin likes it.
An extra moisturizer or a rich cream you don't love on your face can go to your neck, chest and hands, which age right along with your face and rarely get any attention.
Know what not to mix
A lot of drawer products go unused because people are worried about combining them. Most combinations are fine. These are the few I would keep apart.
| Combination | What to do |
|---|---|
| Retinoid + exfoliating acid | Different nights. Together they often leave skin raw. |
| Two exfoliants at once | Pick one. An acid toner plus an acid serum is too much. |
| Retinoid + benzoyl peroxide | Use them at different times of day. Benzoyl peroxide can break down some retinoids. |
| Vitamin C + niacinamide | Fine together. The old warning came from early lab studies, not from how modern products behave. |
The simplest rule: one strong active per night, and let the others take turns through the week.
Keep it from filling up again
Before you buy, name the step. If you can't say which of your steps a new product replaces or adds to, it is probably going in the drawer. This one question has saved me more money than any sale.
One in, one out. When something new comes in, finish or pass along the product it replaces.
Store it well. Keep actives like vitamin C and retinoids cool, dark and tightly closed. A steamy bathroom shortens their life. A drawer in your bedroom or a closed cabinet is better than an open shelf by the shower.
Add one thing at a time. Give each new product two to four weeks before you judge it, so you know what is working and what is not.
Take my six-question routine quiz. It builds a morning and evening routine for your skin, and you can check off anything you already own, so you only see what is missing. You also get a printable weekly schedule.
Take the routine quiz →The bottom line
You do not need a new product to start a better routine. Pull everything out, toss what has turned, pick your five essentials, give a few leftovers a clear job, and keep strong actives on separate nights. What is left is a routine you can follow, and a much smaller drawer.
If you want the whole plan in one place, my Start Here page walks through what to do first and what to add later.
Common questions
How long does skincare last after opening?
Check the open jar symbol on the back of the product. The number inside, such as 6M or 12M, is how many months it is meant to last after opening. Many serums and moisturizers last 6 to 12 months once opened. Sunscreen has a printed expiration date.
Is it safe to use expired skincare?
Expired products are less likely to work as intended, and sunscreen past its date may not protect you as labeled. Products that have changed color, smell or texture may also irritate skin. I would replace them.
How do I know if my vitamin C serum has gone bad?
An L-ascorbic acid serum that has turned dark orange or brown has broken down and lost much of its strength. A pale yellow tint is usually fine. Keeping it capped and away from light helps it last.
Which skincare products should not be used together?
Keep retinoids and exfoliating acids on different nights, avoid using two exfoliants at once, and use benzoyl peroxide and retinoids at different times of day. Vitamin C and niacinamide are fine together.
This is general education from my own research and routine, not medical advice for your skin. If you use prescription skincare or have a skin condition, check with your dermatologist before changing your routine.