Which Ingredients Really Work Against Acne (and Which Ones You Should Avoid)

There are only a handful of ingredients truly proven to work for acne. The most important ones are niacinamide and azelaic acid (the gentlest daily choice), salicylic acid (strongest against clogged pores and blackheads), retinol (speeds up cell renewal), and mild fruit acids like mandelic acid and lactic acid. Bakuchiol is a nice botanical addition for sensitive skin. You don't need ten different jars. One or two well-chosen actives, used consistently every day, will do the job.

First, a note: it's about the ingredient, not the jar

Let me be honest with you. A product doesn't work because it's expensive or because it looks pretty on your shelf. It works because of the active ingredient inside, and how much of it is there. If you understand what an ingredient does, you can choose the right products yourself and never pay for empty promises again.

And do you know what I see so often? People who repeatedly buy the latest trends, are repeatedly disappointed when they don't work, and end up with a bathroom cabinet full of half-used jars. Sound familiar? Good news then: most of it can go. Your skin doesn't need ten steps. It needs the right two.

The ingredients that really matter

Here's your overview. Below the table, I'll tell you about each ingredient individually.

Just the difference between those acids, because everyone asks me. Salicylic acid is a BHA and is oil-soluble, allowing it to penetrate deep into your pores. Mandelic acid and lactic acid are AHAs and primarily work on the surface of your skin. Both useful, but for different purposes.

Niacinamide: the quiet powerhouse almost everyone can handle

Niacinamide, a form of vitamin B3, is for me the foundation in almost every routine. It calms your skin, reduces redness and sebum, and strengthens your skin barrier, making your skin more resilient. It's not a miracle cure on its own, but it's that loyal friend who gets along well with everything. Research shows that about 2 to 5% already works great, and more is not necessarily better. In fact, too much can even irritate. For you, if your skin is easily irritated by strong products, this is the safe choice.

Azelaic acid: my favorite for hormonal acne

If you have hormonal or sensitive acne, this is often the first thing I think of. Azelaic acid tackles your pimples and at the same time fades redness and those stubborn dark spots that remain after a pimple is gone. And it's truly substantiated: scientific research shows that azelaic acid works optimally at 15%. In studies, a 15% gel resulted in up to 70% fewer inflamed pimples, as effectively as benzoyl peroxide, but without the irritation. The only thing it asks of you is patience. Allow a few weeks, and don't give up if your skin needs to get used to it at first. 

If you first want to know if your pimples are hormonal, read hormonal acne in women. There I explain how to recognize it.

Salicylic acid: for clogged pores and blackheads

Salicylic acid is your best friend for oily skin with many small blockages and blackheads. It literally penetrates your pores and cleans from within because it is oil-soluble. In skincare, about 0.5 to 2% works well. Don't use it every day if your skin feels dry quickly; two or three times a week is often enough. 

Mandelic acid and lactic acid: the gentle helpers

These two fruit acids, mandelic acid and lactic acid, are the kind helpers of the story. They gently exfoliate the surface and are never the main player, but a nice addition. In home care, they usually work at around 5 to 10%. In professional peels, they go much higher, up to 40% for lactic acid, but that's a completely different story and not for home use. Mandelic acid penetrates slower, making it extra mild, ideal for sensitive skin. Lactic acid exfoliates and moisturizes at the same time, perfect if your skin is both dry and impure. Important: don't layer these acids on top of other acids, as this can overstimulate your skin.

Retinol: powerful, but build up slowly

Retinol, a form of vitamin A, speeds up cell renewal and keeps your pores clear, and it's one of the most researched ingredients against imperfections. Just to clarify: cosmetic retinol is not the same as a prescription retinoid. It's milder, and in Europe, it's allowed up to a maximum of 0.3% in leave-on products. So start slowly, twice a week in the evening, so your skin doesn't become dry or flaky. And do not use it if you are pregnant or breastfeeding. 

Bakuchiol: the plant-based, gentler version of retinol

Bakuchiol is a plant-based ingredient, extracted from plant seeds, that works a bit like retinol but more gently. It is often chosen by people with sensitive skin who cannot tolerate retinol. To be honest: the evidence is promising, but not as strong as with classic actives, and it has mainly been studied in combination with other ingredients. In practice, you usually see around 0.5 to 1%. 

What about tea tree oil then?

I get that question often, so let me be honest. Tea tree oil is a natural essential oil with antibacterial properties, and in research with 5%, it showed an effect on acne. But the evidence is limited, and about one in five people experienced skin irritation from it. Moreover, the oil quickly degrades if stored improperly, which increases the risk of an allergic reaction. In short: it can be a supplement, but it's not something to build your entire routine around. That's why I consciously choose not to build our line around tea tree.

The gentle helpers in the background

Besides the main actors, there are a few ingredients that offer good support. Not the stars of the show, but nice supporting roles. I'm always honest about it: the evidence here is softer than for the classics, so don't expect it to change your entire skin.

Zinc, often in the form of Zinc PCA, calms your skin, gently inhibits inflammation, and helps keep your sebum somewhat in check. Ideal as a soothing addition for oily, sensitive skin, usually in concentrations of about 0.1 to 1%. But it's a helper, not the sole solution.

Magnolia extract is plant-based and acts as an antioxidant that calms redness and irritation. The evidence mainly comes from lab research and smaller studies, so I use it as a support, not as a primary treatment.

Probiotics and postbiotics help keep your skin microbiome in balance, which can temper inflammation. Promising, but research is still in its early stages, so be cautious with big promises. My whole approach is about your skin being an ecosystem, not a battlefield. I wrote a separate piece about it in the new approach to acne.

Antioxidants like vitamin C and green tea, both plant-based, temper inflammation and help with those spots that remain after a pimple. A nice extra in a routine, not a replacement for your main active.

And oatmeal, natural and gentle, calms your skin and helps restore your skin barrier. Great for soothing irritation when working with stronger actives.

What you should avoid

Not everything popular deserves a place in your routine. Toners full of alcohol dry out your skin and eventually damage your skin barrier, which then causes even more pimples. Harsh scrubbing with beads irritates and worsens inflammation; more scrubbing is truly never the solution. If you recognize this, your skin barrier is likely already compromised. How to tell this is explained in Is your skin barrier damaged?

And then there's benzoyl peroxide, which you see everywhere online. I'm strict about that. It does work, but it's quite aggressive for your skin: it dries it out, irritates it, and even bleaches your towels and pillowcases. And the results are often disappointing. Peer-reviewed studies show that even after a full course, only about a quarter to a third of people achieve nearly clear skin, and then usually in combination with other remedies. In Europe, it is also a medicine, not a skincare product. 

How to build a simple routine with this

You really only need a few steps. A gentle cleanser, one active that suits your skin, something that provides moisture without feeling heavy, and daily sun protection. Choose one main player, for example, azelaic acid for hormonal acne, and possibly add niacinamide to keep your skin calm. The best combinations are niacinamide with azelaic acid, or niacinamide with salicylic acid. It's better not to combine strong ingredients like retinol and many acids at once without slowly building up, as this can irritate your skin. Being consistent with a simple routine always works better than switching between ten products.

Frequently asked questions

Which ingredient is best for hormonal acne?

For hormonal acne, azelaic acid is usually your best first choice. It tackles pimples and at the same time fades redness and spots, and your skin tolerates it well. Niacinamide is a nice, calming addition.

Can I combine multiple actives?

Yes, but carefully. Niacinamide goes with almost everything. Strong ingredients like retinol and multiple acids should not be combined in the same routine without slowly building up, as this can irritate your skin. Start with one main player.

Which ingredient works fastest? Speed is the wrong expectation, sorry. Actives like azelaic acid and retinol take weeks. Those who stop too early mistakenly think it doesn't work.

Why isn't my product working?

Often due to insufficient patience, too low a concentration, or too many different products at once, which overstimulates your skin. One active, used consistently, usually gives the best results.

Do these ingredients dry out my skin?

Not necessarily. Salicylic acid and retinol can cause dryness if you use too much too quickly. Niacinamide and azelaic acid are gentler. The key is to build up slowly and take care of your skin barrier.