Thinking of Trying Tretinoin or Azelaic Acid? Meet the Sandwich Method

Thinking of Trying Tretinoin or Azelaic Acid? Meet the Sandwich Method First!

If tretinoin and azelaic acid have been appearing all over your TikTok FYP lately, you’re definitely not the only one getting curious. Both have become huge skincare talking points, especially among women dealing with acne, stubborn marks and uneven skin tone, and once the before-and-afters start appearing, the desire to try it ourselves is understandably high. We get it, girls!

But if you’ve been doing your research before starting, there’s another term you’ve probably come across: the sandwich method.

And to be REALLY honest with you, this is the part we think deserves just as much attention as the active itself.

Because when you introduce something stronger like tretinoin into your routine, choosing the treatment is only half the story. You also need to think about how you’re going to keep your skin comfortable and moisturised while it adjusts. That’s where the sandwich method comes in, and it’s surprisingly simple.

Okay, what exactly are we “sandwiching”?

The sandwich method gets its name from the way the products are layered. Think of tretinoin as the filling, with moisturiser sitting on either side: moisturiser first, tretinoin next, then another layer of moisturiser on top.

Why are people doing this? Tretinoin is an effective topical retinoid, but dryness, peeling, redness and irritation can happen while the skin is getting used to it. Moisturisation is an important part of managing that adjustment period, and research on topical retinoids supports using moisturiser to improve dryness and overall tolerability.

The exact “sandwich” sequence itself is more of a practical application technique than a medically required rule for everyone, so if tretinoin has been prescribed with specific instructions, those should always come first. But the thinking behind it is useful even for someone who hasn’t started yet: if you’re planning to introduce a stronger treatment, plan your hydration and moisturiser at the same time.

That little bit of preparation can make the whole routine feel far less intimidating.

Okay, what exactly are we “sandwiching”?

The sandwich method gets its name from the way the products are layered. Think of tretinoin as the filling, with moisturiser sitting on either side: moisturiser first, tretinoin next, then another layer of moisturiser on top.

Why are people doing this? Tretinoin is an effective topical retinoid, but dryness, peeling, redness and irritation can happen while the skin is getting used to it. Moisturisation is an important part of managing that adjustment period, and research on topical retinoids supports using moisturiser to improve dryness and overall tolerability.

The exact “sandwich” sequence itself is more of a practical application technique than a medically required rule for everyone, so if tretinoin has been prescribed with specific instructions, those should always come first. But the thinking behind it is useful even for someone who hasn’t started yet: if you’re planning to introduce a stronger treatment, plan your hydration and moisturiser at the same time.

That little bit of preparation can make the whole routine feel far less intimidating.

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And where does azelaic acid fit into all this?

Azelaic acid has been having its own moment too, particularly among people looking after acne and pigmentation. It works differently from tretinoin and is generally considered well tolerated, although dryness, stinging or irritation can still happen for some people.

You’ll also see plenty of routines online using azelaic acid alongside tretinoin. There is clinical evidence for combination regimens involving both ingredients, but how they’re introduced and used together can vary depending on the formulation, strength and individual skin.

So if both are sitting in your cart right now, our advise is to NOT be adventurous on night one. Introduce your treatment according to professional advice, pay attention to how your skin responds, and keep the supporting routine uncomplicated.

And girls, this is where hydration stops being the boring part of skincare and starts becoming very very useful. There is a reason why "hydration is key" is coined.

Before the active, sort out the boring stuff

This is probably the advice we’d give a friend who told us she was thinking about starting tretinoin: get comfortable with the supporting routine first.

You don’t want to wait until your skin feels dry to realise the moisturiser you own isn’t moisturising enough, or suddenly start searching for a hydrating serum three days into the process. If tretinoin is going to become the treatment step, the products surrounding it should already feel familiar and comfortable on your skin.

That can be as straightforward as a gentle cleanser, a hydrating serum if your skin enjoys one, a moisturiser you genuinely like using and sunscreen every morning. Then when the new active comes in, you’re changing one important variable rather than rebuilding your entire skincare routine at once.

Your sandwich needs good bread 😭

Start with hydration: Hydra Boost

If skin tends to feel dehydrated easily, Hydra Boost gives you a straightforward hydration step without introducing another exfoliating treatment into an already active-focused routine. Think of it as keeping one part of the routine very uncomplicated. Your treatment has its own job; your hydrating serum can simply help keep the skin feeling comfortable.

Then there’s the actual “sandwich”: Aqua Boost Moisturizer

Aqua Boost contains moisturising and hydration-supporting ingredients including Sodium PCA, squalane and hyaluronic acid, and it can become the familiar moisturising step you already know before introducing your new treatment. If you’ve spent three nights researching which tretinoin strength people use, this is your reminder to give the moisturiser beside it some attention too.

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Should I start the sandwich method from my first night of tretinoin?

If your prescriber has recommended a particular way to apply tretinoin & azelaic acid, follow those instructions first. For people concerned about dryness or irritation, moisturiser can be useful from the beginning rather than waiting until the skin already feels uncomfortable. The exact placement of that moisturiser can depend on the treatment and professional advice.

Can I use Hydra Boost before tretinoin too?

This depends on how your tretinoin 7 azelaic acid routine has been prescribed. Hydra Boost is intended as the hydrating part of your skincare routine, while Aqua Boost is the more directly relevant CUURA product for the moisturiser step of the sandwich method. If you’ve been given specific instructions about applying tretinoin & azelaic acid to clean, dry skin or about what should go underneath it, follow those instructions.

What about sunscreen the next morning?

This part is easy to forget when everyone is discussing nighttime layering. Tretinoin & Azelaic Acid can make skin more susceptible to sun irritation, and its prescribing information advises minimising unnecessary sun exposure and using sunscreen and protective clothing. So if tretinoin is joining the PM routine, SPF needs a permanent place in the AM routine too.

If tretinoin or azelaic acid has been sitting in your mental “should I try this?” list for a while, there’s nothing wrong with being curious. They’re well-established ingredients with legitimate uses in skincare and dermatology, and learning how to use them properly is far more useful than being scared of them. Just spend a little time thinking about the routine that will sit around them too. The sandwich method has become popular for a reason: it reminds us that introducing a stronger treatment doesn’t mean the rest of skincare has to become stronger as well. Sometimes the smartest supporting routine is simply one that keeps hydration, moisturiser and daily SPF properly covered. So yes, research the tretinoin. Read about azelaic acid. Ask your dermatologist all the questions you need to ask. And while you’re building that routine, don’t forget the sandwich.