Skincare stacking: Ingredients to mix and combos to avoid, according to the experts

Skincare “stacking”, or layering multiple active ingredients in a single routine, is everywhere at the moment. Think: Vitamin C, retinol, niacinamide, exfoliating acids and peptides.

But with the trend comes an expert warning: combining actives without understanding how they interact can potentially damage your skin barrier and reduce product efficacy.

So, how do you combine products safely? We asked the experts – Dr Shreya Andric, principal dermatologist at Northern Sydney Dermatology and Laser, and Mel Stone, registered nurse at Beauty Boost.

Combinations that work well

Vitamin C and sunscreen

“Vitamin C is a powerful antioxidant that helps neutralise free radicals generated by UV exposure, while sunscreen protects against UV radiation,” Andric tells nine.com.au.

“Together, they provide better protection against environmental damage than sunscreen alone.”

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Salicylic acid and niacinamide

“For oily or acne-prone skin, salicylic acid helps unclog pores while niacinamide reduces inflammation and helps regulate oil production,” Andric says.

Retinoids and moisturiser

Andric says retinoids are “one of the most effective ingredients for improving fine lines, pigmentation and acne”, but can cause dryness and irritation, especially when you first start using them.

“Pairing them with a moisturiser helps support the skin barrier and makes them much easier to tolerate,” she adds.

Ingredients to avoid layering

Retinoids and exfoliating acids (AHAs or BHAs)

“One of the most common mistakes is using too many exfoliating or resurfacing products in the same routine, think an AHA/BHA cleanser, followed by a retinol serum, followed by an acid toner,” Stone says.

Andric adds, “Using these together, particularly in the same routine, can increase dryness and irritation, and compromise the skin barrier.”

Retinoids and benzoyl peroxide

“Benzoyl peroxide can reduce the effectiveness of some prescription retinoids, such as tretinoin, and the combination can also be quite drying,” Andric says.

“Newer retinoids, such as adapalene, are more stable, but many people still benefit from using them at different times of the day.”

Does mixing the wrong actives cancel them out?

Stone says the biggest issue here “isn’t reduced efficacy, it’s overcorrection.”

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“The skin becomes so irritated, the barrier stops functioning properly, which then blocks absorption of everything, actives included. A compromised barrier can’t do its job, so even your most expensive, well-formulated products won’t perform as they should,” she explains.

When in doubt, less is more

It’s easy to feel overwhelmed by the constant pressure to buy every new product on the market. Both experts say that at the end of the day, the golden rule is to keep your routine simple.

“Ingredient stacking isn’t inherently bad when done deliberately and strategically, but it needs to be tailored, introduced gradually, and monitored,” Stone says.

“If your skin is red, flaking, stinging, or reactive, that’s your barrier telling you to take your routine back to basics.”

Andric adds that a good skincare routine doesn’t require 10 different active ingredients.

“Start with the fundamentals – a gentle cleanser, a moisturiser and a broad-spectrum SPF 50+ sunscreen every day,” she says.